Casting and powder metallurgy (B22)

B22            Casting; powder metallurgy(28560)
ethod of making articles from tungsten-copper pseudo alloys // 2607478
FIELD: manufacturing technology.SUBSTANCE: invention relates to making articles based on tungsten-copper pseudo alloys. Method involves preparation of tungsten charge, pressing of workpieces, workpieces sintering with formation of porous frame, making contact of produced workpiece side with copper, taken with excess, workpiece impregnation with copper and its cooling. Impregnated workpiece is cooled down from impregnation temperature to copper crystallization temperature, wherein in impregnated blank temperature gradient is created, directed to copper excess location area from workpiece opposite side with provision of workpiece cooling on side opposite to said area. Enabling production of articles with theoretical density of up to 99.6–100 % and absence of properties anisotropy.EFFECT: higher density of articles.1 cl, 2 ex
ethod of producing composite diamond-containing matrix with increased diamond holding based on hard-alloy powder mixes // 2607393
FIELD: manufacturing technology.SUBSTANCE: invention relates to production of diamond tools based on hard-alloy powder mixes. Method of producing a diamond-containing matrix of a diamond tool involves preparation of a hard alloy powder mix, its plastification, in-layer filling the prepared charge and placing diamond grains with a shell of chromium particles into a metal mold, molding the charge with diamond grains into a briquette and sintering the briquette in the furnace with a low-melting metal or alloy in the direction from the bottom to the top. Diamond grains are used with the shell of a uniform layer of chrome particles with the thickness of not less than 5 % from the minimum linear size of diamond grains produced by fixing a plasticized powder of chrome on the surface of diamond grains with subsequent drying. Sintering the briquette in the furnace is performed by heating first for 60–90 minutes up to the temperature of 600 °C, then for 60–70 minutes up to the temperature of 860–1,000 °C, after that up to the temperature of 1,100 °C with provision of thermodiffusion metal coating of the diamond grains with chromium.EFFECT: provided is reduced consumption of diamonds due to increased strength and reliability of diamond grains fixing in the tool matrix, as well as higher resistance of the diamond tool.3 cl, 1 dwg
ethod of producing finely dispersed crystalline powder of synthetic mineral alloy for fire-extinguishing powder compositions // 2607217
FIELD: chemistry.SUBSTANCE: invention relates to chemical industry and can be used for production of fine powders, in particular used as target additive to fire extinguishing powders in order to improve their fluidity. Raw material used is fused synthetic mineral alloy containing oxides of silicon, aluminium, calcium, iron, magnesium, titanium, chromium, potassium and/or sodium. To produce finely dispersed crystalline powder material is melted, primary fibre is stretched from obtained melt, which is cooled in air. Cooled primary fibre is subjected to grinding to produce a powder containing 55–60 wt% particles with size of 40–50 mcm and 25–30 wt% particles with size of up to 100 mcm.EFFECT: technical result consists in possibility of obtaining fine crystalline powder, having chemical, fractional compositions and fluidity corresponding to target additives used in fire-extinguishing powder compositions with minimum power consumption.1 cl
ethod of producing refractory materials // 2607115
FIELD: manufacturing technology.SUBSTANCE: invention relates to production of refractory materials. Method involves preparation of exothermic mixture of powders and mixture of powders of chemical furnace, formation of layered batch, initiation of combustion reaction therein in form of self-propagating high-temperature synthesis (SHS) with pressing of obtained SHS product. Mixture of powders of chemical furnace is made of stoichiometric mixture of powders of titanium and carbon black. Formation of layered batch is performed by placing exothermic mixture of powders inside mixture of powders of chemical furnace at ratio of thicknesses of exothermic mixture of powders and mixture of powders of chemical furnace equal to 1:0.5–1:4. Exothermal mixture of powders is separated from mixture of powders of chemical furnace 0.1–1.0 mm thick graphite layer. Initiation of combustion reaction in form of SHS is performed simultaneously in mixture of powders of chemical furnace and exothermic mixture of powders at pressure of 5–20 MPa and 1–20 s after initiation obtained SHS product is pressed under pressure of 100–450 MPA during 1–30 c, then it is cooled and obtained refractory material is separated from combustion products of mixture of powders of chemical furnace.EFFECT: decreased residual porosity and high hardness of material are achieved.1 cl, 1 dwg, 1 tbl, 2 ex
ethod of producing articles from refractory materials // 2607114
FIELD: technological processes.SUBSTANCE: invention relates to production of articles from refractory materials. Method involves preparation of an exothermic mixture of powders, forming a charge billet, initiating a reaction of self-propagating high-temperature synthesis (SHS) and pressing the obtained product of the SHS. Exothermal mixture of powders is pressed into briquettes with the thickness of 10–30 mm and the relative density of 0.5–0.7. Charge billet is formed in the form of layers of the said briquettes from the exothermic mixture of powders separated by a layer of graphite of 0.2–1.0 mm thick. SHS reaction is initiated simultaneously in all layers of the charge billet at the pressure of 5–20 MPa, herewith in 1–20 sec after the initiation the obtained product of the SHS is pressed at the pressure of 100–450 MPa for 1–30 sec.EFFECT: provided is obtaining articles with minimal residual porosity and high hardness.1 cl, 1 dwg, 1 tbl, 2 ex
ethod of producing powdered magnetically hard alloy 30h20k2m2v of iron-chrome-cobalt system // 2607074
FIELD: technological processes.SUBSTANCE: invention relates to production of powder of magnetically hard alloys. Method of producing powder of magnetically hard alloy 30H20K2M2V of iron-chrome-cobalt system involves preparing a mixture of powders of iron, chromium, cobalt, molybdenum and tungsten, moulding produced mixture, sintering, thermal treatment and thermo-magnetic treatment. After sintering before thermal treatment, method comprises hot plastic deformation with drawing of not less than 1.1. Thermo-magnetic treatment is carried out in temperature range 650–600°C.EFFECT: sintering temperature of alloy is lowered and magnetic hysteresis properties of alloy are improved while maintaining high coercitive force.1 cl, 1 tbl, 1 ex
ethod of producing graphite mold to produce castings from refractory and chemically active alloys // 2607073
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to production of elements of molds and cores by layer-wise three-dimensional jet printing for production of shaped castings from titanium alloys by centrifugal and gravity casting for further production of cast parts of aircraft, helicopter and rocket engines, as well as cast parts for nuclear power engineering or chemical industry. Elements of molds and cores are made from crystalline graphite powder fraction 0.05–0.2 mm, consisting of particles with compact non-lamellar shape, which if necessary is mixed with aluminium powder in amount of 3–7 wt%. Binder used is liquid thermosetting resin. Printing of elements is performed by application of a support layer of powder material, on which successively layer by layer are deposited layers of graphite powder. On each applied layer in required areas of at least one printing head binder is applied to form bound in required points of each layer of graphite powder. Surface of each layer is exposed to radiation from an infrared source for evaporation of volatile components of binder and its partial polymerisation. After obtaining printed object, corresponding to the element being made, it is heated to temperature of 250–350 °C without removal from surrounding non-bonded graphite powder for complete polymerisation of binder and sintering at temperature 900±50 °C in vacuum or inert atmosphere in support filler from material which is inert with respect to titanium and graphite.EFFECT: possibility of making components of molds and cores by layer-wise three-dimensional jet printing for production of castings from refractory and chemically active alloys.1 cl, 8 dwg
Powder of iron-based alloy for wear-resistant surfacing and sputtering // 2607066
FIELD: chemistry.SUBSTANCE: invention relates to powder alloy, which can be used for application of wear-resistant and corrosion-resistant coating by deposition or sputtering. Powder of iron-based alloy contains 2.9–3.3 wt% carbon, 0.4–1.0 wt% silicon, 0.4–1.2 wt% manganese, 17–21 wt% chromium, 0.15–1.2 wt% aluminium, 3–4.5 wt% vanadium, 0.02–0.12 wt% barium, not more than 0.06 wt% sulphur and not more than 0.07 wt% phosphorus.EFFECT: higher impact-abrasive wear resistance, as well as stabilisation of hardness of surfaced coat.1 cl
ethod of centrifugal casting of thin-wall tubes of heat-resistant alloys // 2606824
FIELD: technological processes.SUBSTANCE: invention relates to metallurgy and can be used for casting of complex alloyed heat-resistant alloy 50H32N43V5S2B2, in particular tubes with diameter of 0.076–0.159 m, wall thickness 0.008–0.014 m and length 3.0 m. On internal surface of mold heat-insulating material is applied as layer with thickness of 0.0007–0.0012 m. Metal released from furnace into ladle is poured into mold, heated to 150–250 °C and rotating with speed corresponding to value of gravitation coefficient, equal to 70–160, on inner surface of cast. Metal tapping from furnace into ladle is carried out at temperature within range [Tliq+k1⋅(1,695-Tliq)] °C, where Tliq is liquidus temperature of metal, k1 – empirical coefficient equal to 0.78…1.00. Pouring of metal into mold is performed at weight rate of 8–16 kg/s and temperature within range of [Tliq+k2⋅(1,595-Tliq)] °C, where k2 is empirical coefficient equal to 0.77…1.00.EFFECT: production of pipes with dense and uniform structure, having improved short-term and long-term mechanical properties.1 cl, 3 tbl
Apparatus for hot forming powder materials // 2606823
FIELD: metallurgy.SUBSTANCE: invention relates to hot forming of parts from powder workpieces. Apparatus includes storage of powder workpieces, electric resistance furnace, inductor, press for hot pressing, die, mechanism for feeding powder workpieces from inductor into die and an extractor with a mechanism for removal of parts from die. Powder workpiece storage is made with a mechanism for feeding powder workpieces into electric resistance furnace and is arranged in front of its input. Electric resistance furnace and inductor are placed with vertical arrangement of heating elements in a housing closed with a thermal shield, are configured to hold powder workpieces in form of a column and are equipped with common mechanism for vertical displacement powder workpieces, configured for movement of former down from column of powder pieces from electric resistance furnaces into inductor. In lower part of electric resistance furnace there is a locking mechanism for column of powder workpieces, and in upper and lower parts of said housing there are devices for supply of protective gas medium.EFFECT: reliable operation of apparatus and higher quality of heating of workpieces.1 cl, 3 dwg
ethod of directed crystallization of casts in casting gas turbines blades and device for producing casts with directed and monocrystalline structure in casting gas turbines blades // 2606817
FIELD: foundry.SUBSTANCE: invention relates to foundry and can be used to produce casts of gas turbines blades from a refractory alloy. Device comprises placed in vacuum casing (2) process chamber (16), which is divided horizontally into a heating zone and a cooling zone by heat-insulating screen (9) mounted on locking ring (14). Ring (14) is built in cylindrical wall (15) at a distance from the base of the wall making 0.25, preferably 0.30–0.55, of its height. Casing (16) in the cooling zone consists of two parts, between which there is annular gas collector (17) equipped with bidirectional gas ejectors (18) located at the distance of at least 40 mm, preferably 45–75 mm, from the lower surface of heat-insulating screen (9). Investment mold 1 with the melt is moved from the heating zone into the cooling zone, where the cast is cooled by a supersonic flow of an inert gas fed into the area of the cast crystallization with the flow rate of 0.5–2 g/sec per nozzle.EFFECT: provided is optimal conditions to form a directed and monocrystalline structure of metal and to eliminate a cast defects in areas of the cast thickness change.14 cl, 4 dwg
Ejection nozzle for spraying melts // 2606674
FIELD: metallurgy.SUBSTANCE: ejection nozzle for spraying melts has housing with annular slot for hot compressed gas supply, union with protective cover and central channel to feed melt. Outlet edge of protective cover has semi-circular cutouts with radius r=(0.5÷1.0) mm, located at equal distances from each other. Minimum number of cutouts nmin= 2, and maximum nmax=πR/2r, where R is radius of outlet edge of protective cover, mm. Higher fine fraction in the sprayer is ensured.EFFECT: invention can be used for production of metal powders.1 cl, 2 dwg, 3 tbl, 1 ex
ethod for production of articles from powders of high-alloyed nickel-based alloys // 2606360
FIELD: metallurgy.SUBSTANCE: invention relates to powder metallurgy of refractory nickel alloys and can be used in production of shafts and discs operating at high temperatures with increased service life in aircraft gas turbine engines and gas pumping stations. Method of making articles from powder of a high-alloyed nickel-based alloy involves obtaining the powder of a high-alloyed nickel-based alloy, compacting the powder as a 3D billet, plastic deformation of the 3D billet in a sealed capsule-container and thermal treatment. Obtained is an alloy powder with the particle size of less than 50 mcm by gas-jet spraying the melt with crystallization at the cooling rate of not less than 50,000–100,000 K per second to form in the structure of the powder particles a supersaturated solid solution of alloying elements in nickel with sub-dendrite structure sized less than 2,000 nm. Compacting the powder as a 3D billet in a sealed capsule-container is carried out by stamping at the temperature of 500 °C up to a temperature not more than the recrystallization temperature for the high-alloyed nickel-based alloy.EFFECT: provided is higher level and stability of mechanical properties, as well as higher yield.3 cl, 1 tbl
ethod of producing alloyed powders in vibrofluidised bed // 2606358
FIELD: metallurgy.SUBSTANCE: invention relates to powder metallurgy, particularly, to alloyed powder, and can be used in various engineering fields, particularly for gas-thermal spray coating. Method of producing alloyed metal powder includes mixing alloying powder with base powder and chemical-thermal treatment with provision of diffusion bonding of alloying powder particles with base powder, mixing base powder of fractional composition 0.5–500 mcm and fine alloying powder, heating produced mixture to temperature not exceeding temperature of exothermic effect of mixture, wherein heating, chemical-thermal treatment and cooling of mixture is carried out in a vibrofluidised bed in presence of an activator.EFFECT: higher quality of powders with simplification of technology and reduction of time for preparing them.8 cl, 2 dwg, 2 tbl, 2 ex

ould for reception of slag and metal // 2605729
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for pouring slag and metal melts of aluminothermic process of melting ferrovanadium. Through wider upwards mould is made with a tray and has round cross section. Slenderness ratio on one side of side surface is 50-80 %, ratio of height to average diameter of cross section of its working cavity is 0.19-0.23. Working surface of tray is made in form of a conical recess with an inclination formed in peripheral zone of 9-30 %.EFFECT: mould simplifies processes related to strip ingot, separation of metal and slag processing, and improving quality of slag due to reduction of content of metal inclusions.1 cl, 4 dwg, 1 tbl

ethod for cooling metallic strand, and switching valve for intermittently permitting and shutting off volume flow of cooling medium // 2605723
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to continuous metal casting. Method of cooling steel workpiece in roller guide includes periodic supply of cooling medium to workpiece through nozzle (2) by means of switching valve (1), active driving of switching valve (1) by a binary control signal (5). Control is carried out depending on desired cooling power. Depending on control signal (5) switching element (1) is converted from closed position into open position for passage of cooling medium (21) through switching valve (1) and supply of cooling medium through cooling nozzle (2) onto workpiece (3) and vice versa.EFFECT: higher intensity of cooling in a wide range in a simple, stable and energy-efficient manner.23 cl, 14 dwg

ethod of producing metallurgical billets with porous structure and device for its implementation // 2605720
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and foundry and can be used for production of foam metals and foamalloys. In pouring autoclave 1, under gas pressure P3, mold 2 is placed. Peculiar feature of invention is working gas pressure P3 control in casting capsule 1, that provides boiling of liquid foamalloy and creation of fundamental foam structure of ingots and casts. Metal melt, saturated with gas or vapor of added melt of fusible material, e.g. calcium, magnesium, zinc, is fed into mold via gate pipe 10 due to pressure difference P3 in autoclave 1 and P2 in furnace autoclave. After reaching of preset melt level in metal mold 2 casting is stopped for time required for crystallization of required thickness of walls, control of working gas pressure in pouring autoclave 1 is performed. Melt in mold, part of it flows in receiving container 4, and in billet foam structure is formed.EFFECT: higher yield is achieved due to elimination of shrinkage cavity in quiet steel ingots.6 cl, 3 dwg

Slag forming mixture for steel refining // 2605410
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for steel refining in "ladle-furnace" aggregates and vacuum vessels. Slag-forming mixture contains as flux secondary aluminium production wastes and a slag component and additionally sodium bicarbonate at following ratio of components, wt%: sodium bicarbonate 1.0-2.0, wastes from production of secondary aluminium 10.0-30.0, slag component makes up balance. Secondary aluminium production wastes, having following chemical composition, wt%: fine Al metal 5.0-20.0, Al2O3 50.0-75.0, MgO 5.0-12.0, SiO2 1.0-10.0, (NaCl+KCl+NaF+KF+Na2O+K2O) 5.0-20.0.EFFECT: achieving low viscosity of slag, high degree of refinement and desulphurisation of steel, resistance of lining.1 cl, 1 dwg, 3 tbl

Twin roll caster and method for control thereof // 2605026
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Two-roll caster includes a pair of casting rolls 102,104 arranged parallel to each other with a gap between them, side partition walls 106, parallel to each other, forming bath P between casting rolls and side partition walls. Devices 108 provide application of force to support of side partition at an angle of 15-45o relative to axis of casting rolls. End parts of casting rolls form in side partition walls worn-out inclined grooves to prevent formation of crust.EFFECT: longer service life of side partition walls.18 cl, 1 tbl, 9 dwg

ethod of casting monocrystalline metal parts // 2605023
FIELD: technological processes.SUBSTANCE: present invention relates to metallurgy. Method includes casting a molten alloy into a cavity of a mold through a casting channel. Casting channel has adjacent to cavity a transition zone, in which after casting is formed metal bridge (261, 262, 263) adjoining metal part. Section of bridge is increased in direction of main axis (X) of section of mould cavity, wherein bridge is thinner than casting channel. After solidification, cast is subjected to heat treatment and mould is removed.EFFECT: limiting recrystallisation of parts.12 cl, 5 dwg, 1 tbl

ethod of metal powders producing // 2604743
FIELD: metallurgy.SUBSTANCE: invention relates to metal powders production. Proposed method comprises heating metal material to melting point thereof using laser radiation, formation of melt drops, cooling in free flight in neutral gas to temperature lower than melting point of metal material and collection of powder particles. Heating of metal material to melting point thereof is performed using laser radiation by cutting a specimen of metal material with displacement towards an untouched mass of material at a rate providing formation of melt in place of contact therewith. Formation of melt drops is performed in direction of plasma jet by means of its pressure and/or jet of compressed neutral gas. Powder particles are collected in volume of powder trap located on side of specimen of metal material, opposite to location of laser head for formation of laser radiation.EFFECT: higher efficiency of producing metal powder, as well as stability of shape and fractional composition of powder.3 cl, 2 dwg, 1 ex

Device for pressing powder materials of electronic engineering articles // 2604552
FIELD: electronics.SUBSTANCE: invention relates to pressing electronic engineering articles from a powder material. Device contains a press base located horizontally, a bottom male die with its base arranged on the horizontal surface of the press base and a top male die, a female die with closed working cavity. Top and bottom male dies are made as rectangular parallelepipeds. Female die consists of four parts, two of which are made as halves of a hollow truncated cone and are arranged at a distance from the horizontal surface of the press base, herewith the cross section in horizontal plane of the inner surface of each of the two halves is an isosceles trapezoid with a smaller base equal to the male die base, and two other parts of the female die are located inside along the ends of the said two parts of the female die in the form of halves of the hollow truncated cone and are made as straight triangular prisms. Female die on the outer side is equipped with a clamping ring, inner surface of which repeats its outer surface, and on the inner side each of the two parts of the female die representing halves of the hollow truncated cone is equipped with an elastic deformation insert in the form of a rectangular parallelepiped.EFFECT: higher quality of pressing is ensured.5 cl, 1 dwg, 1 tbl

Device and method (versions) for slag thickness measuring // 2604543
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and is intended to measure slag thickness on liquid metal surface. Device contains wire made from electrically conducting material, which can be melted under effect of heat at slag temperature, wherein wire has free end designed for immersion into slag. Device also comprises wire feed facilities, making it possible to move wire so, that its free end is vertically immersed into slag in accordance with preset trajectory. There is also measuring device to measure distance, which wire free end passes in period of time when wire is moved under action of supply device, and supply control device, wherein control device includes detector to detect contact between free end of wire and liquid metal surface.EFFECT: technical result is higher measurement accuracy.17 cl, 7 dwg

Level measurement in metallurgical vessels // 2604481
FIELD: measuring equipment.SUBSTANCE: present invention relates to methods for electromagnetic measurement of a vertical filling level of a bath with electrically conductive material contained in a metallurgical vessel. Disclosed measuring system comprises: transmitting conductor (5) for generating an electromagnetic field when connected to an alternating power source, receiving conductor (6), which is arranged to sense electromagnetic field for generation of an output signal as a function of vertical filling level, wherein transmitting and receiving conductors (5, 6) are arranged inside metal casing (2), to co-extend with mutual spacing (d) to define spacing area (7) that faces containment volume (3) and extends along periphery of containment volume (3), in a substantially closed circuit, wherein spacing distance (d) is selected so that changes in output signal are influenced by change of electromagnetic field caused by local changes in amount of conducting material, adjacent to said spacing area (7), wherein part of spacing area (7) defines a vertical measurement region, in which spacing area (7) is slanted along periphery of containment volume (3) so as to diverge from horizontal and vertical directions of vessel (1).EFFECT: purpose of invention is to install a sensor for measuring level, independent of shape of metallurgical vessel, as well as to provide a sensor for measuring level, aimed at increasing signal resolution in vertical direction and improving signal quality.22 cl, 11 dwg

ethod of producing mould from material with heat-resistant polymer matrix // 2604285
FIELD: metallurgy.SUBSTANCE: invention relates to production of composite material for moulds and can be used for moulding thermoplastic, fusible metals and composite materials based thereon. Method of making mould includes preparation of composite material containing 35 % of silicon carbide with particle size 5 mcm, 17 % of silicon carbide with particle size 2.5 mcm, 10 % of silicon carbide with particle size 1.25 mcm, 8 % of silicon carbide with particle size of 0.63 mcm, 6 % of silicon carbide with particle size 0.125 mcm, 8 % microsilica, 12 % of epoxy resin MR Advanced Poxy-Systems, 4 % hardener MR Poxy-Systems, 0.15 % wetting agent for epoxy compositions BYK-P1045, 0.01 % of antifoaming agent Troysol 307 Troy, composite material is prepared by mixing of solid components in a container with epoxy resin and container with hardener, wherein solid components are added to container in proportion to ratio of epoxy resin and hardener, mixing is carried out at a rate of 100-120 rpm for 10-15 minutes, the composition from smaller container is transferred into a larger container and obtained composition is mixed in same mode, a structure is mounted on tabletop of a vibration table for filling composition with moulding cavity, limited by surfaces of model of end product at joint line formed by mould and mould plate valves, in which is mounted a prefabricated cooling/heating system, obtained composition is poured into moulding cavity with simultaneous vibration, after which tabletop with structure is removed from vibration table and held for 1 hour in furnace at temperature 150 °C, followed by removing tabletop with structure from furnace and holding at room temperature for 24 hours, followed by separating structure from tabletop and sending for assembling mould.EFFECT: technical result is increased rigidity and accuracy of making mould, higher thermal and corrosion resistance and heat conductivity.1 cl, 2 dwg

ethod for production of workpieces (semi-finished products) from fast-crystallised aluminium alloys // 2604284
FIELD: metallurgy.SUBSTANCE: invention relates to powder metallurgy using fast crystallisation, in particular to production of workpieces from aluminium alloys. Disclosed method involves preparation of aluminium melt, centrifugal casting of granules, their cooling and further stepped vacuum degassing in sealed process capsules, then performing compaction of granules in sealed process capsules without additional heating in a press container, heated to temperature not less than 400 °C, and machining compacted briquettes to produce compact workpieces. Centrifugal casting of granules and cooling of obtained granules is carried out in liquid nitrogen medium at constant temperature of minus 196 °C, wherein cooling rate during crystallisation of granules varies from 1.05 × 10,000 to 100,000 K per second.EFFECT: reduced content of hydrogen and oxygen in metal workpieces, improved mechanical properties of workpieces, reduced cost of production.1 cl, 1 tbl, 1 ex
Low-voltage pulse electric arc method of producing metal nanopowder in liquid medium // 2604283
FIELD: metallurgy.SUBSTANCE: invention relates to low-voltage pulse electric-arc production of metal nanopowder in liquid medium. Method involves installation of two electrodes in a vessel with a liquid medium, applying pulse voltage to electrodes to form plasma in liquid medium and formation of nanoparticles from material of electrodes, precipitation of nanoparticles. Method uses a first electrode, installed with possibility of vibration on mechanical vibrator and with possibility of back-and-forth movement along entire length of second electrode. Second electrode used is a strip from same material, as first electrode, fixed at bottom of vessel with liquid medium. Bipolar pulses are applied on electrodes from a low-voltage generator with forced closure and opening of electrical circuit. Discharge gap between electrodes is sinusoidally varied to allow generation of high-current discharge between electrodes.EFFECT: increased intensity of electric field between electrodes and reduced contamination of produced powder.1 cl, 1 ex

ethod of making shell ceramic molds // 2604281
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to production of casts based on removable (melted, burnt out, gasified) models. Method involves layer by layer deposition on a model of shells by immersing model in a suspension of refractory filler and binder solution and subsequent dusting with granular material. In dusting material of each layer, except last, coacervate is introduced in an amount of 0.5-1.5 wt%. Models are removed and shells are calcined. Coacervate used is alum.EFFECT: reduced drying time of each layer of shell mold.1 cl, 1 ex

Installation for electric heating of ladle lining // 2604278
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Plant includes a mechanism for moving a ladle, rod resistance heaters, fixed on heat-insulated cover, suspended by means of flexible links on a cross beam, lever lifts for movement of cross beam, mounted on a working site. Laser sensor is installed on cross beam, which laser sensor controls vertical position of heaters during movement of cross beam. On working site there is a laser sensor for detection of crust on upper end surface of ladle. Processes of heating and movement of heaters and ladle are performed by an automatic control system.EFFECT: eliminating impact loads, leading to breakage of heaters, and longer service life of group of heaters.1 cl, 4 dwg

ethod of parts reconditioning by electroslag buildup // 2604165
FIELD: machine building.SUBSTANCE: invention can be used for parts reconditioning by electroslag buildup. After part and metal mold fastening melting consumable electrode in form of package, assembled and welded from several metal bars, aligned along edge. Using rods, made from rolled stock appropriate by size and chemical composition, on which charge is applied. At least one of rods is extended from package and has sharpened end, charge is not applied to said rod.EFFECT: invention provides extending range of recovered parts, will simplify supply of charge into melt.1 cl, 1 dwg, 1 tbl

Parting coating for casting moulds // 2604163
FIELD: technological processes.SUBSTANCE: invention relates to metallurgy and can be used for colouring moulds, for casting aluminium alloys at low pressure. Parting coating contains filler in form of a mixture of powders of titanium dioxide with particle size of up to 1 mcm, talc with particle size of up to 25 mcm, pulverised quartz with particle size of up to 10 mcm and barium sulphate with particle size of up to 6 mcm, liquid glass and water in following ratio of components, wt%: titanium dioxide 3-6, talc 1-4, pulverised quartz 0.5-2, barium sulphate 0.5-3, liquid glass 6-11, water - balance.EFFECT: coating provides higher surface quality of accurate thin-wall casts.1 cl, 1 tbl

agnetically hard material and product made therefrom // 2604092
FIELD: metallurgy.SUBSTANCE: invention relates to powder metallurgy, namely to magnetically hard material containing iron, cobalt, boron, dysprosium, copper. Wherein material also contains zirconium. Magnetic material chemical composition corresponds to formula, at. parts: (Pr1-x1Dyx1)12-15(Fe1-y1Coy1)rest(ZrzCu1-z)y2B6-7, where x1 = 0.44-0.48; y1 = 0.30-0.36; y2 = 1.0-2.0; z = 0.005-0.05. Product of magnetically hard material is also disclosed.EFFECT: technical result is increase residual induction of material, while maintaining values of temperature coefficient of induction.2 cl, 1 tbl

ethod of metal powders producing // 2604079
FIELD: technological processes.SUBSTANCE: invention relates to production of metal powder. Method comprises metal donor powder heating to its fusion temperature, formation of metal drops and their cooling under inert gas environment and powder collection. Powder donor metal sample surface is heated by laser radiation, which is moved within powder donor metal sample surface area at rate, sufficient for formation of melt bath on it, which volume is from 10-5 to 10 mm3. Fused metal amount from melt bath is crushed and blown by compressed inert gas stream to allow metal drops free flight until their cooling below melting temperature, wherein powder particles are collected in powder trap volume. Powder fraction size is adjusted by changing laser radiation power, and/or laser beam focusing, and/or speed of laser beam movement relative to powder donor metal sample surface, and/or duration of laser radiation action on donor metal sample, and/or by compressed inert gas stream pressure and speed.EFFECT: enabling higher efficiency of metal powder production.1 cl, 3 dwg

Device for injection-moulding part // 2603756
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly parts of a wax model. Device comprises two blocks with cavities which, after superposition of blocks one on another, corresponds to shape of cast part (25). In cavity 6 of block there is rod 10 defining shape of cooling circuit of cast part. Lower block (4) is equipped with means of positioning rod 10 in form of support surfaces (8, 9) and presser screw screwed (13, 14) screwed into threaded opening of block (4.) Presser screws hold rod in position opposite support surfaces (8, 9). Force applied to rod by screws is limited by means located between head and threaded part of clamping screw.EFFECT: preventing destruction and displacement of rod.11 cl, 5 dwg

ethod of producing crystalline nanopowders of metal oxides using cryotreatment of aqueous-organic sols // 2603658
FIELD: metallurgy.SUBSTANCE: invention relates to a method of producing crystalline nanopowders of metals with the size of crystallites of less than ≤ 10 nm and can be used in chemical industry, for production of intermediate products for fine ceramic materials. Synthesis is carried out in a water-organic medium using as sources of metal nitrates, chlorides or acetates. For formation and stabilization of sol used are acetylacetone-alcoholic solutions of N,N-dimethyloctylamine, hexamethylene tetramine or monoethanolamine. As a complexing agent used is acetylacetone. Obtained sol through a jet nozzle is dispersed into liquid nitrogen, where at the cooling rate > 30° cryogranulating takes place. Produced granules are subjected to vacuum-sublimation drying to form a cryo-airgel, which is then annealed at 500 °C in air for 3 hours.EFFECT: proposed method provides technologically effective and environmentally acceptable method of producing nanocrystalline of metal oxides.4 cl, 8 dwg, 1 tbl, 6 ex

Device for direct rolling of liquid metal // 2603412
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to direct rolling of a tape between rolls-crystallizers. Device comprises metal reservoir (1), rolls-crystallizers (2) and inductor (6) with magnetic-pulse unit, connected to the metal reservoir. Metal reservoir with bandage (3) with a nichrome coil is installed in body (4). Heat-insulating plates (5) are placed between the housing and metal reservoir.EFFECT: milling structure by directed action of pulse magnetic field ensures obtaining thinner tape and improved mechanical properties.5 cl, 4 dwg

ethod of producing titanium boride powder // 2603407
FIELD: chemistry.SUBSTANCE: invention relates to production of powder of titanium diboride. Method involves preparation of a wet reaction mixture of initial titanium-containing, boron-containing components and reducing agent in form of carbon-containing components, drying mixture and carbothermal reduction in reaction mixture while heating. Titanium-containing components used are titanium dioxide in anatase form or titanium dioxide precursors, subjected to hydrolysis and modification with a fluoride anion. Carbothermal reduction in reaction mixture is carried out while heating to temperature of 1,000÷1,050 °C with holding in an atmosphere of dynamic vacuum. Titanium dioxide precursors used can be hydrated titanium dioxide, titanium tetrachloride, titanyl sulphate and ammonium hexafluorotitanate. Carbon-containing components used can be active forms of carbon in form of soot, or contained in molasses, sucrose, citric acid.EFFECT: higher efficiency of producing powder of titanium diboride, low power consumption.4 cl, 2 tbl, 7 ex
Composition of ceramic layer for making moulds and other articles // 2603402
FIELD: metallurgy.SUBSTANCE: invention can be used for production of casts by method of casting on molten models. Composition contains a liquid ceramic mass and ceramic material for dusting. Liquid ceramic mixture contains, wt%: 50-75 % - ceramic material, which is a mixture with particle size distribution, containing at least 90 % particles with size less than 0.04 mm, havin following phase composition: 30-90 % forsterite Mg2SiO4, 5-15 % fiyalite Fe2SiO4 and 5-65 % of mixture of phase components, such as chrysolite 2(Mg0.88Fe0.12) SiO2, enstatite MgSiO3, tremolite Ca2Mg5Si8O22(OH)2, ringwoodite (Mg,Fe)2, diopside Ca(Mg,Al)(Si,Al)2O6 and other, and 25-50% binder containing aqueous or aqueous-organic colloidal solution of metal oxide and modifiers. Ceramic material for dusting is a mixture, having following phase composition, wt%: 30-90% forsterite Mg2SiO4, 5-15 % fayalite Fe2SiO4 and 5-65 % of mixture of phase components, such as chrysolite 2(Mg0.88Fe0.12)SiO2, enstatite MgSiO3, tremolite Ca2Mg5Si8O22(OH)2, ringwoodite (Mg,Fe)2, diopside Ca(Mg,Al)(Si,Al)2O6 and others.EFFECT: preventing breakdown of moulds when filling with metal and possibility of directional solidification of castings.1 cl, 4 ex

Dust emission reduction during metal casting // 2603397
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Method is carried out on a casting apparatus comprising an endless conveyor having a plurality of casting moulds with upper open tops, movable in a first section from a casting station to a discharge station and in a second section back to casting station. Method comprises providing a casing forming a bottomless box over a part of first section of endless conveyor, injecting within said casing a gas on a surface of casting mould with an angle sufficient to blow off loose, solid particles or slag, and extracting gas and solid particles by suction from within said casing.EFFECT: reduced dust emission in apparatus for casting metal or slag.16 cl, 2 dwg

achine for forming metal bars // 2602924
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used in production of ingots from precious metals weighin from 50 g to 50 kg. On loading position (101) of machine, solid metal is loaded into mould from pouring device "A" and chemical additive, acting on crystalline structure of material from dosing device "B". Mould is closed with covers and moved by pusher into next positions. On position of melting (102) metal in said mould is fused in melting furnace. Chemical additive further added to liquid metal from dosing device "C". Position of hardening (104) metal in mould comprises a trough or cooling bath. Position of cooling (105) includes means for cooling ingot, bath with cooling fluid for fast cooling and means for extracting and collecting cooled ingots. Unloading position (106) comprises unloading of moulds with ingots or empty moulds after extraction fast-cooled ingots.EFFECT: providing accurate dimensions and weight of ingots and improvement of their metallographic structure.17 cl, 6 dwg

Use of tubular rod made of tungsten carbide for reinforcing of polycrystalline diamond composite matrix // 2602852
FIELD: mining.SUBSTANCE: group of inventions relates to reinforced impregnated matrix downhole tool, method of its reinforcement, as well as to reinforced impregnated matrix drill bit. Reinforced impregnated matrix downhole tool includes housing, containing carbide material and copper or copper alloy impregnating binding material; blade made integral with housing and made from same materials as housing, and extending approximately from one housing end in direction of housing second end, wherein blade comprises leading edge, trailing edge and surface extending from leading edge to trailing edge; at least one cutter installed on said surface; intermediate priming coating connected with leading edge and/or said surface and being chromium-nickel alloy, containing one or more reducing substances; and reinforcing material, connected with at least part of intermediate priming coating, in which intermediate priming coating is attached to blade and with reinforcing material.EFFECT: technical result consists in reduction of wear due to application of reinforcing material.24 cl, 8 dwg

Gas line for recirculation of exhaust gases // 2602722
FIELD: engines and pumps.SUBSTANCE: in channel (2) of exhaust gas recirculation there are upper ribs (3), as well as multiple lower ribs (4), which are arranged through preset distance (5A-5C, 6A-6C) in direction perpendicular to direction of exhaust gas flow so that they are adjacent to each other. Upper ribs (3) and lower ribs (4) gradually narrow on width in corresponding directions of protrusion so that both sides in transverse direction have inclined surfaces. Angle (β) of inclination of inclined surfaces of lower ribs (4) is larger than angle (α) of inclination of inclined surfaces of upper ribs (3).EFFECT: invention can be used in internal combustion engines (ICE).4 cl, 7 dwg

ethod of single-crystal stubs production // 2602584
FIELD: technological processes.SUBSTANCE: invention relates to metallurgy and can be used during monocrystalline articles casting, for example, gas turbine engines turbine working blades with preset crystallographic orientation. Method involves production of billets stubs having cylindrical shape by casting. During casting on billet generatrix along cylinder axis marks are made in form of one or two diametrically arranged ledges or slots. Performing cast pieces crystallographic analysis, selecting billets, on which position of marks is aligned with billet structure azimuthal crystallographic direction, and performing selected billets cutting for stubs.EFFECT: higher accuracy of casts stubs orientation, stubs production lower labor input.1 cl, 2 dwg, 1 tbl

ethod for production of high-speed steel from wastes of worn-out cutting tool // 2602579
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used in production of high-speed steel from lumpy wastes of worn cutting tools and die tooling by electroslag remelting. Lumpy wastes are preliminarily sorted and before welding are chosen so that ratio of weight fractions of used wastes of various grades of high-speed steel enables to obtain as a result a remelt, produced consumable electrode is remelted, and final ingot has chemical composition that differs from composition of initial lumpy wastes making up electrode.EFFECT: invention widens possibility of using wastes of worn-out cutting tool from high-speed steel, which are part of a welding electrode, and enables to remelt wastes in a single-step process, that makes it possible to save electric energy and prevents burning out expensive alloying elements.1 cl, 2 ex, 7 tbl

Powder of alloy based on uranium and molybdenum in (-metastable phase, composition of powders comprising said powder, and uses of said powder and composition // 2602578
FIELD: metallurgy.SUBSTANCE: invention relates to powder of an alloy containing uranium and molybdenum in a metastable γ-phase, powder composition containing said powder, as well as to versions of use of said alloy powder and said powder composition for making fuel elements, in particular, fuel elements for experimental nuclear reactors, and targets, intended for production of radioactive elements, in particular for imaging in medicine. Powder of an alloy is formed by particles consisting of a core of uranium-based alloy, containing molybdenum in metastable γ-phase, which is coated with a layer of aluminium oxide, which is in contact with core. Powder composition for making fuel element or target for producing a radioactive element includes uranium-based alloy powder, containing molybdenum in metastable γ-phase mixed with powder containing aluminium, wherein uranium-based alloy powder containing molybdenum, is 65-90 wt% of weight of powder composition, and powder containing aluminium, has weight content of aluminium equal to at least 80 %.EFFECT: higher resistance of composition to action of neutron radiation.31 cl, 2 ex, 1 tbl, 9 dwg

ethod of producing electric carbon articles // 2602569
FIELD: manufacturing technology.SUBSTANCE: invention relates to production of electric carbon articles based on carbon. Method comprises mixing graphite filler with binder and pressed obtained powder mixture in a mould with vertical male die at die speed of , mm/s, where m is mass of filling mixture, g, c is a coefficient equal to 1,400÷1,700, lesser value of which is used for powder with smaller particle size at high air humidity, and larger value is used for powder with large particle sizes at low air humidity.EFFECT: higher density and improved physical and mechanical properties of articles.1 cl

Device for production of 3d articles // 2602329
FIELD: manufacturing technology.SUBSTANCE: invention relates to production of 3D articles. Device includes a post, construction platform, sealed construction chamber arranged on post, devices for maintaining working medium in chamber, supply of powder and planarisation of powder layer on construction platform, layer-by-layer laser sintering and removal of excess material, as well as containers for placement of construction platform with vertical drive and collection of excess powder. Construction chamber is made with a process hatch arranged in bottom part, and is equipped with a cover placed under construction chamber capable of moving vertically, said cover coupled with container of construction platform.EFFECT: increasing size of article without increasing size of construction chamber.3 cl, 6 dwg

Block mold for ship propellers blades casting from titanium alloys // 2602314
FIELD: technological processes.SUBSTANCE: invention relates to metallurgy, preferably, to large-sized ship propellers blades from titanium alloys casting into block mold. Block mold comprises working cavity 6, gating system with riser 3, heads 4, 5 and feeder 11. Block mold is made with vertical connector, passing along blade edges screw line, and horizontal connector 10. Outside mold closure belt 9 in form of collar is made along screw line, which width is less than wall thickness and is equal to 2-2.5 of blade edge casting radii, and height makes 0.3-0.4 of belt width. After closure belt in block mold connection point cavity is made filled with moulding mixture. Horizontal connector plane separates block mold into two parts, passes through blade axis and divides pitch angle between blade first and last radial sections in two. Block mold wall thickness in places of blade and hub implementation makes 0.6-0.8 and 0.4-0.5 of casting wall thickness, and in head system shaping points is 0.7-0.9 of feeder thickness.EFFECT: invention allows to increase block mold service life, reduce its warpage and increase castings quality.5 cl, 5 dwg

ethod of producing articles from powders of refractory nickel alloys // 2602311
FIELD: metallurgy.SUBSTANCE: invention relates to refractory nickel alloys powder metallurgy and is used in production of articles, operating at high temperatures with increased service life in aircraft gas turbine engines and gas pumping stations. In disclosed method produced by crystallization of powder particles of specified alloy melt powder, performing separation of powder from foreign metal and non-metal particles, powder is placed into steel capsule, capsules with powder are evacuated and hot isostatic pressing is carried out. Then capsule material is removed from article surface and heat treatment is carried out to achieve optimal preset mechanical properties. At that, crystallization of powder particles is performed at rate of not less than 50,000 degrees K/s to produce particles, which size does not exceed diameter of 50 mcm, and gas medium during powder particles production has dew point of not more than minus 52 degrees Celsius, corresponding to not more than 0.0012 % of water vapor volume fraction.EFFECT: enabling higher efficiency of production and quality of articles.1 cl, 1 tbl, 1 ex

Device and method of making cutting plates // 2602310
FIELD: technological processes.SUBSTANCE: invention relates to device and method of making cutting plates workpieces from sintered powder. Cutting plate workpiece (10) making device (40) from pressing sintered powder, having central axis (A) determining axial and radial directions, comprises base (42), having through hole (50), plurality of radial channels (52) for male dies and plurality of radially directed matrix channels (54), cover (44), made with possibility to be fitted on base (42) and having through hole (46), wherein central axis (A) passes through base and cover through holes (50, 46) during cover (44) installation on base (42), upper male die (56) and opposite lower male die (58), wherein, upper male die (56) is made with possibility of axial movement through cover through hole (46), and lower male die (58) is made with possibility of axial movement through base through hole (50), plurality of side male dies (60) arranged in opposite pairs, wherein side male dies are made with possibility of radial movement in channels (52) for male dies, and plurality of matrix rods (74), made with possibility of radial movement in matrix channels (54), wherein each matrix rod (74) is common for two adjacent side male dies (60) and is located between them, wherein each matrix rod (74) has front moulding surface (78) and two guide surfaces (82), wherein two adjacent side male dies (60) are made with possibility of sliding along common rod (74) matrix guide surfaces (82). Side male dies slide on matrix rods, wherein side male dies and matrix rods move in base channels, on which cover is installed, upper and lower male dies are moving in cover and base through holes, and female die rods are fixed during sintered powder pressing, wherein upper, lower and side male dies form workpiece surfaces, and matrix rods form workpiece edges.EFFECT: invention is aimed at higher quality of workpieces.11 cl, 8 dwg
 
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