Casting and powder metallurgy (B22)

B22            Casting; powder metallurgy(28560)
Composite antifriction material and its manufacturing method // 2614327
FIELD: metallurgy.SUBSTANCE: invention refers to antifriction materials. Composite antifriction material based on bronze-filled PTFE consists of tin and lead bronze, PTFE and ultradisperse diamonds at the following component ratio, wt %: PTFE 5-6; ultradisperse diamonds 0.065-0.187; the rest is tin and lead bronze. Method of material manufacturing involves preliminary mixing of PTFE and ultradisperse diamond powders. Then the mix is mixed with tin and lead bronze powder. Obtained three-component mix undergoes cold pressing at 8000-9000 kgf/cm2 followed by hot pressing at 355-400 °C and pressure of 4500-5500 kgf/cm2. Hot-pressed workpiece is cooled down to room temperature under the pressure of hot pressing.EFFECT: enhanced mechanical strength and tribo-technical parameters of composite antifriction material.2 cl, 2 tbl, 1 ex
ethod of spherical powder from intermetallic alloy production // 2614319
FIELD: technological processes.SUBSTANCE: invention relates to production of spherical powder from intermetallic alloy. Method involves melting of cylindrical billet end from intermetallic alloy rotating about horizontal axis in spraying chamber with plasma jet arc plasmatron with enabling centrifugal spraying of melted particles and their hardening at flight in working gases medium, wherein hot working gases mixture is taken from spraying chamber, cooled down and cooled working gases mixture is supplied into spraying chamber enabling fused particles cooling, wherein hardened particles are collected in receiving bin. Cooled down working gases mixture is supplied into spraying chamber with controlled intensity and orientation by means of cooling flows formers, made in form of at least two different diameters axial sprayers, ensuring outgoing from sprayers cooling flows overlapping to make cooling zone of melted particles with controlled temperature gradient.EFFECT: lower temperature in spraying chamber to required values, increased particles cooling rate control efficiency.1 cl, 1 dwg

ethod of making 3-d products and apparatus for realising said method // 2614291
FIELD: physics.SUBSTANCE: group of inventions relates to the making of 3-D products from the powder in the form of closed shell with a bottom part. The bottom part is formed on the support, then the outer shell is formed at height from the groups of the layers, wherein each of said groups of layers is formed by means of powder filling layer by layer, its planarization and layered laser sintering of a specified area in the plane of each layer to obtain shells of the given height, after forming of each layer group, the inner cavity of the outer shell is filled with the powder to the height of this layer group and carry out laser sintering of the inside cavity powder of the of said shell to its full depth. The offered device is designed for manufacturing the 3-D product layer by layer from powder by the said method.EFFECT: invention provides a reduction of time spent for 3-D product creation.4 cl, 3 dwg

Powder compaction device // 2614279
FIELD: mechanical engineering.SUBSTANCE: invention relates to a technique of compression, in particular to a device of bilateral pressing of the powders, but preferably the porous material with a low bulk density, such expanded graphite to obtain a rod, rods of various diameters and a composition comprising a metal sleeve with a sealed therein expanded graphite to obtain electrode. The device for pressing the powders comprises mould forming rods mouthpiece, an array of cylindrical form, mounted with a holder and punch. Additionally, it is provided with a second similar mould. Molds are arranged coaxially and are joined metal rods and the guide sleeve. As the metal sleeve, the conductive tube is used. The holders are made detachable and additionally have cavities of cylindrical shape to contain the matrix, associated with a large base of the cone clips holes. Punches have removable limiters of the cage motion in a direction from the ends to the central portion at an angle and the sleeve, as a device element, is formed with a smooth inner surface.EFFECT: possibility of obtaining a monolithic conductive product in the form of expanded graphite rod or an electrically conductive composition, which comprises a thermally expanded graphite in a metal shell with a uniform distribution of properties, and increase the adhesive bond between the components of the composition; as well as the expansion of technological capabilities of the device.3 cl, 7 dwg
ethod of shot production from cast iron by processing steel chip // 2614227
FIELD: metallurgy.SUBSTANCE: steel chip is mixed with graphite, the mixture is placed in the holes of the die and heated in the oven upto the temperature of 1150-1200°C, providing carburization of steel to convert it into the cast iron, melting the cast iron, and then perform its cooling in water to obtain the shot.EFFECT: it is provided the processing of steel chips to produce the shot with the structure of white cast iron.2 dwg, 1 ex
etal-polymer composition for manufacturing pim - products // 2614010
FIELD: metallurgy.SUBSTANCE: invention relates to powder metallurgy, in particular to metal-polymer compositions for manuracturing PIM-products by means of moulding and sintering said compositions. The composition is prepared by means of mechanical mixing the two mixtures; the components of the first one are finely divided powders of the alloying element and iron, and the components of the second one are an organic binder and a plasticizer - stearic acid, the composition comprising the titanium powder as an alloying element, and the mixture of paraffin and polypropylene as an organic binder. Wherein said two mixtures are mixed in the weight ratio of 65:35, the nanoscale part of the initial powders being 3.7 wt % and having the size distribution curve in the range of 30-70 nm.EFFECT: invention provides obtaining the composition having sedimentation resistance, as well as high fluidity, for the production of moulded articles of any degree of complexity.5 cl, 3 ex
ethod for consumable electrode producing from alloys based on titanium and aluminium intermetallic compounds // 2613832
FIELD: metallurgy.SUBSTANCE: invention relates to manufacture of consumable electrode for melting ingots of titanium-aluminium alloys containing 15-63 wt % of aluminium. Method comprises preparing a charge by mixing titanium sponge and semi-finished aluminium product, charge portion flow into conical matrix and subsequent through-feed pressing. Titanium sponge is used in the form of spherical bodies with a diameter of 10-25 mm, and aluminium semi-finished product - in the form of bars with the diameter : length ratio = 1:1. Ratio of linear aluminium semi-finished product dimensions to linear titanium sponge dimensions is 2.5-3.5.EFFECT: increased mechanical properties of electrodes.2 cl, 6 tbl
Slag-forming mix for continuous steel casting with high aluminium content // 2613804
FIELD: metallurgy.SUBSTANCE: slag-forming mix comprising (wt %): carbon (5-8), fluorine (6-9), calcium oxide (30-40), aluminium (10-18), silicon (5-9), sodium (9-12), lithium (3-5), boron (6-10), manganese (1-2) and inevitable impurities (the rest). Steel is provided with an aluminium content of up to 2 wt % at a slag melting temperature 350-400°C below the liquidus temperature of steel and slag viscosity of 0.06-0.25 Pa⋅.EFFECT: chemical inertness of molten slag-forming mix to liquid steel.3 tbl, 1 ex

Device for support and oscillation of continuous caster mould // 2613802
FIELD: technological processes.SUBSTANCE: device (10) comprises a frame (20) and supports (30). Shake-free assembly (31) of the support is mounted on the frame (20). Ducts (50, 60) for the cooling medium are formed in a slide assembly (32). Junction of vertical and horizontal ducts for the cooling medium of (31) and (32) assemblies is provided by T-shaped tubes (70). The tube (70) comprises the first duct (71) rigidly connected to the assembly (32) in a horizontal direction (B), the second (72) and the third (73) ducts, passing in opposite directions from the first duct (71) along the direction (A), connected to the end portions (80, 81) of the shake-free assembly (31) via channels (100, 101). The second duct (72) is made dummy while the third duct (73) is made through. The ducts (72, 73) and preferably the duct (71) have the same diameter as the cooling medium supply tubes.EFFECT: optimal working conditions of mould oscillation servo-gear are provided due to the release of the mould from vertical hydraulic forces affecting it by directing them to the shake-free assembly of the support.9 cl, 3 dwg
Hypereutectic silumin piston blank production method // 2613498
FIELD: metallurgy.SUBSTANCE: method includes: furnace charge melting, melt hydrogen refining, out-of-furnace melt modification by ligature containing phosphorus compounds, piston blank preparation and its homogenization. In this case, out-of-furnace melt modification is carried out with providing for crushing of primary silicon crystals by applying an alloyed rod from quickly cristallized one at a cooling rate of at least 1×102 K/s, aluminum-based alloy containing dispersed phases of aluminum compound with the phosphorus (AIP) having a particle size 50 nm to 10 microns, and the melt is refined until the hydrogen content level is not more than 0.35 cm3/100 g. The blank is produced by semicontinuous casting.EFFECT: invention allows to produce hypereutectic silumin piston blanks by semicontinuous casting method with physical and mechanical characteristics similar to the moulded blank from pellets.2 tbl, 1 ex

Inductor core, arrangement for press and manufacturing method // 2613331
FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering. Inductor core is made of a compressed soft magnetic powder material and comprises a base core portion having a first surface and an opposite second surface; an inner core portion extending from first surface in a direction transverse to first surface; an outer core portion extending, in direction transverse to first surface, from first surface to an end surface of outer core portion. Outer core portion at least partly surrounding inner core portion, thereby forming a space around inner core portion for accommodating a winding. First surface comprises a recess for accommodating a connection portion of winding, said recess extending at least a part of a distance between inner core portion and outer core portion. Outer core portion has a slit extending from said end surface towards recess. Second surface comprises a first protrusion oppositely arranged to recess.EFFECT: technical result consists in improvement of efficiency.14 cl, 10 dwg

ethod of continuous casting for titanium or titanium alloy ingot // 2613253
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy. Method involves feed of molten titanium or titanium alloy into crystalliser and drawing an ingot down during hardening. Thickness of hardened ingot shell in the contact area (16) between casting mould (2) and ingot (11) is maintained within predefined range by controlling temperature (TS) of a site (11a) in contact area (16) and/or by transient heat flow (q) from site (11a) towards casting mould (2). Mean temperature of ingot surface site in the contact area is set within 800 °C<TS<1250 °C range.EFFECT: improved quality of ingot surface.4 cl, 10 dwg
ethod of producing graphite fiber articles // 2613245
FIELD: technological processes.SUBSTANCE: method comprises supplying graphite fiber composite to the mould preheated to 100÷120 °C, exposing for 3÷4.5 min with heating the mould to 185÷190 °C and pressing at the punch speed of 45÷48 mm/s.EFFECT: increased article density.
anufacturing method of casts by gasified models // 2613244
FIELD: metallurgy.SUBSTANCE: method involves models producing in the die moulds, models assembly into a model unit, the model block painting by gas-penetrable non-stick paint, model unit arrangement in the mould box, filling of the mould box by unjoined moulding material, its compacting by vibration, sealing and vacuuming of mould box, metal pouring. The models are produced by applying the modifiers to the prelimenary foamed expanded polystyrene raw beads, its filling to the mould together with the uncolored expandable polystyrene raw beads and final foaming. The modifiers are applied in the form of chemically curing cladding composition, consisting of weight %: nano-structured diamond powder 0.5…1.0; periclase 1.5…2.0; aqueous solution of aluminoboriumphosphatic - the rest. The modifiers application is performed by injecting the aerosol of cladding composition into the fluidized bed of expandable polystyrene raw beads with a specific rate (1…4)×10-3 kg/c⋅m2.EFFECT: increase of physical and mechanical and casting properties of alloys and castings.3 tbl, 2 ex

ethod of making workpieces of tungsten-titanium hard alloy // 2613240
FIELD: technological processes.SUBSTANCE: invention relates to production of tungsten-titanium hard alloy workpieces. Method involves hot pressing powder in vacuum while passing high current through mold and pressed powder at a temperature of 1,320 °C for 3 minutes. Powder used is produced by electroerosion dispersion of wastes of hard alloy T15K6.EFFECT: higher operational resistance.1 cl, 10 tbl, 2 ex

ixture for making tungsten-titanium hard alloys // 2612886
FIELD: technological processes.SUBSTANCE: invention relates to production of tungsten-titanium hard alloys. Charge contains tungsten carbide powder and titanium carbide in form of a product electroerosion dispersion of wastes of hard alloy T15K6, which is obtained in kerosene and distilled water and has an average particle size 19.692 mcm and 5.118 mcm respectively.EFFECT: higher quality of tungsten-titanium hard alloys.1 cl, 3 dwg, 2 ex
ethod of obtaining magnesium alloy granules // 2612869
FIELD: metallurgy.SUBSTANCE: method comprises atomizing of magnesium alloy supernatant liquid in a protective gas atmosphere with a rotating spray cup. Atomization is carried out in a protective gas atmosphere positioned between the surface of the spray cup and the cooling medium. Gaseous nitrogen with a dew point less than - 50°C is used as the protective atmosphere, and 4-6 percent KOH alkaline aqueous solution is used as the cooling medium.EFFECT: higher mechanical properties of magnesium alloys.1 tbl, 1 ex
Surface alloying method for iron-carbon alloy castings // 2612864
FIELD: metallurgy.SUBSTANCE: method includes applying to the surface of the polystyrene foam model of an alloying compound which is prepared by blending mix powder with glutinous binding agent, the content of which does not exceed 90% of the mix powder weight, notice that the mix powder has the following composition: 5÷80% titanium by weight and 70÷10% ferroboron by weight at the borron content of not less than 6%. The materials put into the alloying compound promotes the SHS reaction in casting forming.EFFECT: obtaining on the iron-carbon alloy castings of an alloyed layer of high hardness, of the specified thicnkness and composition.12 cl, 2 ex
ethod for producing monochrystalline rotor blades of gas turbines // 2612672
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for the production of monocrystalline working blades for gas turbines with the improved characteristics of the resource and the operating temperature. In manufacturing the monocrystalline rotor blades of gas turbines, a monocrystalline blade billet of the specified crystallographic orientation is cast, the metal penetration and the remnants of ceramics are removed from the cast surface by means of sandblasting, with the following blade size control to determine the allowance amount to be removed by abrasion. After the allowance removal, the blade surface treated by an abrasive is etched in order to remove the defective surface layer with the distorted crystal structure. Then high-temperature annealing of the blade is carried out.EFFECT: invention allows to improve the quality of the blades due to the stabilisation of the monochrystalline structure of the working turbine blades during their production.2 cl, 2 dwg
Casts surface alloying method for iron-carbon alloys // 2612476
FIELD: metallurgy.SUBSTANCE: method includes applying to the surface of the polystyrene foam model of an alloying compound which is prepared by blending mix powder with glutinous binding agent, the content of which does not exceed 90% of the mix powder weight. The powder mixture has the composition: 60÷90 wt % titanium and 40÷10 wt % elemental carbon.EFFECT: materials included into the alloying compound provide the SHS reaction in casting forming, which permit to obtain the alloyed layer of high hardness, of the specified thickness and composition on the iron-carbon alloy castings.12 cl, 2 ex

ethod of metal parts surfacing for aircraft jet turbine engines and local protection tooling for said method implementation // 2612471
FIELD: metallurgy.SUBSTANCE: invention relates to metal parts (301) surfacing method for aircraft turbojet engine and tooling for its implementation. Metal part is set into surfacing (301) position in chamber (201), having upper part (202) with hole (208). Movable cover (221) with hole (222) is installed on hole (208) in chamber upper part (202). Performing nozzle (103) positioning on movable cover (221) hole (222) level. Introducing inert gas into chamber (201). Performing metal powder application on metal part (301), laser beam or electrons beam emission for metal part (301) surfacing, applied powder warming up by said beam with provision of metal part (301) surfacing. During surfacing process performing nozzle (103) movement relative to chamber (201) in accordance with metal part (301) surfacing path, wherein by nozzle (103) displacement performing movable cover (201) movement on chamber (201) upper part (202).EFFECT: result is provision of considerable rectilinear nozzle movement, which enables to cover entire surfacing area, as well as insulation, which prevents fast gas flow from chamber, accordingly preventing part oxidation during surfacing.14 cl, 5 dwg

Part with different surface quality and synthesis method thereof // 2612470
FIELD: medicine.SUBSTANCE: group of inventions relates to production of high-precision sintered parts of medical prosthesis. Method consists of following steps: obtaining file containing geometrical description of specified shape of sintered part, upbuilding with powder material as per obtained file of certain sections of part of chromium and cobalt alloy, sintering of upbuilt part to obtain sintered part, intermediate heat treatment of sintered part including heating of sintered part up to temperature of 1,000 °C, further cooling of heated sintered part at room temperature and milling of selected sections of sintered part after intermediate thermal treatment. High-precision part has two surfaces different in terms of quality. One section of surface has roughness, obtained as a result of sintering and it is a result of particle size of powder material, and other section has smooth or polished surface, obtained as a result of three-dimensional machining in form of milling.EFFECT: high degree of accuracy of machined sections with 9 class allowance is provided.7 cl, 4 dwg
ethod of titanium carbonitride nanopowder obtainment // 2612293
FIELD: metallurgy.SUBSTANCE: nitrogen plasma flow is generated, raw titanium-containing material and gaseous hydrocarbon are injected in the flow and mixed, steam and gas carbonitride-forming reaction mix of required composition is formed, carbonitride is condensed, force-cooled and separated from the flow. Titanium micropowder of +0.5-5 mkm size is used as titanium-containing powder material natural gas with methane content not less than 90.0 vol% is used as gaseous hydrocarbon, and they are injected together at the flow temperature not less than 5200 K, reaction products are cooled at 2800-2000 K, then passivated and coagulated by propenoic acid vapour added to the flow at molar ratio of titanium to propenoic acid 1:(0.025-0.075).EFFECT: improved quality and increased output of titanium carbonitride nanopowder, significant reduction of free pyrolytic carbon content, powder nanoparticle protection against sirface oxidation, increased efficiency of powder entrapment in filter.1 tbl, 7 ex

ethod for producing aluminium nanopowders // 2612117
FIELD: nanotechnology.SUBSTANCE: invention relates to obtaining aluminum nanopowder from aluminium electrical wire waste and contains at least 99.5% of aluminium. Lead waste spark erosion dispersion in distilled water at a pulse repetition frequency of 95 - 105 Hz, the voltage across the electrodes 90 - 10 and 65 mcF capacitors, followed by centrifugation to separate the solution of large-sized particles from the nanopowder.EFFECT: method of producing aluminium nanopowder, which provides reduced energy costs and improves the ecological purity of the process.6 dwg, 2 ex
ethod of titanium-based composite workpiece manufacturing // 2612106
FIELD: metallurgy.SUBSTANCE: invention refers to titanium-based composite workpiece manufacturing. Method involves preparation of charge containing titanium alloy waste, and change compaction by pressing to form workpieces. Charge is prepared by adding titanium powder to titanium alloy waste treated in alkaline solution at the 70/30 weight ratio of waste and titanium powder, obtained charge is pickled in acid solution to ensure deoxidation and hydrogenisation up to 0.1-1 wt % of hydrogen in titanium, then the charge is ground along with mixing and heated to pressing temperature, after pressing, impurities are removed from workpiece surface, the workpiece is lubricated, rolled and dehydrogenised thermally.EFFECT: improved mechanical properties, strength and plasticity of workpieces.3 cl, 1 ex
ethod of producing silver nanoparticles // 2611520
FIELD: nanotechnologies.SUBSTANCE: invention relates to the field of nanotechnologies. For obtaining silver nanoparticles mixed is a fructose-glucose syrup from girasol tubers with a silver nitrate solution. To obtain the fructose-glucose syrup squeezed is juice from girasol tubers and mixed with hot water in the ratio of 1:1(2). Obtained solution is added with food citric acid to reach the pH of 3.0–4.0 and exposed to a microwave field at the temperature of 80–85 °C for 20–30 minutes. Fructose-glucose syrup is concentrated up to the content of not less than 70–80 % of dry substances at the temperature of 60–70 °C. Fructose-glucose syrup from girasol tubers may also be obtained by dissolving powder (dried syrup) in hot water. Produced fructose-glucose syrup is mixed with the silver nitrate solution in the volume ratio of 5(6):1, treated with ammonium hydroxide solution up to the pH of 8.0–8.5 and exposed to a microwave field at the temperature of 65–70 °C for 1.5–2 hours. Sol of silver nanoparticles is obtained.EFFECT: invention simplifies and lowers the process cost of producing silver nanoparticles, reduces power consumption.1 cl, 2 dwg, 1 tbl, 4 ex

ethod of combining diamond monocrystal with metals // 2611254
FIELD: metallurgy.SUBSTANCE: method includes plasticizing hard-alloy powder mixture, filling the metal mold with the end charge, compressing the charge to briquettes, laying diamond monocrystal onto the briquette surface and sintering the briquette with the diamond monocrystal soaked in low-melting metal or an alloy in the upward direction. Herein a layer of plasticized fine chrome powder with the thickness of 0.3-2 mm is formed on the end of the briquette, diamond laying is produced on top of the finished layer of plasticized fine chrome powder on the briquette end surface, and the briquette sintering is conducted at the temperature not higher than 1100 °C with the holding time of not greater than 5 minutes.EFFECT: increased strength and reliability of the compound of diamond monocrystal with the tool metal base.2 cl, 1 dwg
ethod of quasi-crystalline al-cu-fe alloy powder obtainment // 2611253
FIELD: metallurgy.SUBSTANCE: metal powders are mixed at a ratio corresponding to quasi-crystalline phase field for Al-Cu-Fe system. Charge is melted in crucible simultaneously with dispersion by an electric arc pulse discharge in a vacuum chamber in inert gas medium, where anode is the vacuum chamber surface and conductive equipment inside it while cathode is the melting cricuble. Electric arc pulse frequency is 0.5 kHz, pulse duration is 10 to 300 mks. Quasi-crystalline alloy powder is condensed by heat exchange on the cooling surface of the vacuum chamber.EFFECT: improved quality of spherical powder of quasi-crystalline alloy, including higher homogeneity and reduced dispersion range.1 dwg, 1 ex

Process and apparatus for manufacturing long steel products in continuous casting plant // 2610997
FIELD: metallurgy.SUBSTANCE: invention relates to continuous casting. Metal product (1) with a fully hardened core downstream of crystalliser (2) is subjected to deformation on curved and straight sections of curved continuous casting plant (10). Withdrawal/straightening unit (4) of plant (10) comprises a pair of rollers (4A, 4B, 4C, 5A, 5B, 5C), alternating so that axes of rotation of rollers of adjacent pairs are perpendicular. Thus, product (1) is alternately deformed in two directions, by changing its perimeter and cross-section, which increases speed of product (1).EFFECT: increasing rate of release of product to required product feed rate in rolling mill.22 cl, 2 tbl, 4 dwg

Device for coupling head fixation on mould-cast electrode, respective device and method // 2610992
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy. Device 20 for fixation of coupling head includes support (70) of coupling head (22), mould base (72) supported by support (70), so that the mould base (72) defines axial hole (104) for passage of the coupling head (22), tip (74) for mounting of the support (70) on travel element (44) of the device (20) in mould (42), and device (76) for lengthwise fixation of the coupling head (22) on the support (70). The device (76) is adjustable in at least two different directions along longitudinal axis (B-B'). Device 20 is shifted towards casting ring of bottom unit, and molten metal is fed into casting chamber. In the process of continuous electrode casting, coupling head is welded to the electrode.EFFECT: simplified process of coupling head fixation on electrode.15 cl, 6 dwg

ould for continuous casting of metals // 2610984
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Mould has cavity 2 which has a pouring opening for liquid metal and an outlet opening for a cast strand. Cross-section of mould is at least partially is formed with profiled circuit 8 of side walls 5.5', 6.6', which continues in direction of casting. Circuit 8 is in form of a wavy profile, which has a number of channels (9), extending in parallel from filling hole to outlet of cavity of mould.EFFECT: ratio of inner perimeter of mould cavity to width W of channel is greater than 30, and width W of channel ranges from 1,5 mm to 30 mm.16 cl, 5 dwg, 1 tbl

ethod for production of niobium powders // 2610652
FIELD: chemistry.SUBSTANCE: invention refers to production of highly pure niobium powder using hydride method. The method includes activation of niobium ingot by heating up to 700-900°C, its hydrogenation using saturated titanium hydride as hydrogen source, grinding of obtained niobium hydride to prescribed despersivity degree and dehydrogenation of obtained niobium powder using unsaturated titanium hydride. Niobium ingot is activated by heating under overpressure of 0.01-0.3 MPa in hydrogen atmosphere generated by hydrogen desorption from saturated hydride of multi-component intermetallic compound La1-yRyNi4Co where R designates rare-earth metals of cerium group and/or mishmetal, 0<y≤1, while hydrogenation of niobium ingot being initiated by hydrogen. Simultaneously with activation of niobium ingot, saturated titanium hydride is heated to its decomposition temperature with release of hydrogen and when hydrogen overpressure of 0.2-0.2 MPa is reached, started hydrogenation of niobium ingot is continued with hydrogen released during decomposition of titanium hydride.EFFECT: shortened hydrogenation and dehydrogenation duration, increased process safety and lowered hydrogen losses.3 dwg, 1 tbl, 2 ex
Centrifugally cast composite roller and way of its manufacturing // 2610645
FIELD: metallurgy.SUBSTANCE: present invention relates to composite rollers used in rolling process. Centrifugally cast composite roller comprises an outer layer made of cast iron, comprising, by wt %: 2.7-3.5 C, 1.5-2.5 Si, 0.4-1.0 Mn, 3.7-5.1 Ni, 0.8-2.2 Cr, 1.5-4.5 Mo, 2.0-4.5 V and 0.5-2.0 Nb, remaining Fe and unavoidable impurities, wherein the weight ratio of Nb/V is 0.18-0.65, and the weight ratio of Mo/V is 0.7-2.5, and the iron structure includes calculating the square phase 15-45%, 1-10% cementite and graphite phases, and an inner layer made of cast iron, is metallurgically bound to the outer layer; thus suitable for use in the rolling region of the outer layer depth of 10 mm or more, the surface has no dendrites segregated bainite and/or martensite having a diameter of 1.5 mm or more.EFFECT: document describes the structure and method of manufacturing centrifugal composite roller.9 cl, 9 tbl, 7 dwg
ethod of producing nano-sized structures of molybdenum // 2610583
FIELD: technological processes.SUBSTANCE: invention relates to production of nanodispersed powder of molybdenum. Method involves reduction of molybdenum hexafluoride with hydrogen in a reactor under effect of microwave discharge. Reactor is filled with a gas mixture consisting of molybdenum hexafluoride and hydrogen, molar ratio of which is not less than three quarters of total volume of gas mixture, and sealed. Microwave discharge used is non-equilibrium microwave discharge of surface type in a pulse periodic mode.EFFECT: obtaining a homogeneous nanodispersed powder of molybdenum.4 cl, 1 tbl, 3 ex
ethod of passivating fine aluminium powder // 2610580
FIELD: technological processes.SUBSTANCE: invention relates to passivating fine aluminium powder. Method involves thermal treatment and further cooling of the powder, herewith the aluminium powder is heated to the passivation temperature of 200–350 °C and thermal treatment of the aluminium powder is performed in air with the humidity of 8–12 g/m3 for 30–150 minutes.EFFECT: provided is formation on the powder surface of particles of an oxide film of Al2O3 while maintaining the content of active aluminium in the powder over 98 %.1 cl, 1 dwg
ethod of producing titanium carbosilicide-based composite // 2610380
FIELD: technological processes.SUBSTANCE: invention relates to production of titanium carbosilicide-based composite. Method involves preparation of powder mixture consisting of powders of titanium, silicon carbide and graphite and aluminium oxide nanopowder, mechanical synthesis of powdered mixture and cold pressing of mixture. Titanium powder used has particle size 100–300 mcm, silicon carbide powder has particle size of 10–100 mcm and graphite powder has particle size 1–10 mcm. Cold pressing of mixture is carried out at pressure of 300 MPa, cold pressing is followed by plasma-spark sintering at temperature of 1,300–1,500°C and pressure of 30 MPa.EFFECT: reduced content of impurities of carbides and titanium silicide, reduced porosity of material.3 cl, 2 dwg, 1 ex

Colloidal solution of nanosilver in ethylene-glycol and method of its production // 2610197
FIELD: nonotechnologies.SUBSTANCE: proposed invention refers to the production of a colloidal solution of nanosilver in ethylene-glycol. The colloidal solution contains ethylene-glycol and nanoparticle of silver within the concentration from 1 to 100 mg/l. The percentage of nanoparticles of silver with the size of 5-8 nm is from 3 to 5%; 30-50 nm, from 28 to 30%; 50-75 nm, from 38 to 40%; 75-100 nm, from 23 to 25%. The colloidal solution is produced by reduction of ethylene-glycol solution of trifluoroacetate of silver or monochloroacetate of silver with the concentration of 10-3-10-5 mol/l equimolar amount of ascorbic acid. The reduction is being performed during agitation in ethylene-glycol medium at the temperature of 20-25°C. The obtained colloidal solution of nanosilver is stable for more than half of a year and stored in glass vials in complete darkness.EFFECT: this document describes the production process of the colloidal solution of nanosilver in ethylene-glycol.2 cl, 4 dwg, 4 ex

Treatment of chemical feedstocks // 2609882
FIELD: technological processes.SUBSTANCE: invention relates to treating a zirconium containing feedstock. Method includes fluorinating a feedstock comprising dissociated zirconium, to obtain a zirconium fluorine compound and a silicon fluorine compound. Zirconium fluorine compound is separated from silicon fluoride compound. Method optionally includes reaction of zirconium fluorine compound with a halogen, alkali metal halide or alkali-earth metal halide to obtain zirconium halide. Method then includes plasma reduction of zirconium fluorine compound or, in case of presence thereof, zirconium halide in presence of a reducing agent to obtain zirconium metal.EFFECT: method enables to produce nuclear-pure zirconium metal or zirconium metal with less rigid characteristics in terms of hafnium content; process is "dry", which enables to obtain less waste in comparison with a "wet" method.13 cl, 1 dwg
ethod for obtaining fine titanium powder // 2609762
FIELD: chemistry.SUBSTANCE: method comprises the activation of the starting material, the hydrogenation, grinding the resulting titanium hydride, titanium hydride thermal decomposition in a vacuum and grinding the resulting cake of titanium. As starting material the ingot is used, which is obtained by the vacuum remelting of titanium raw materials in water-cooled copper ingot mold and crystallizing at a specific heat flux through the surface of the mold (3.3-3.9) ⋅ 106 W / m2. Activation is led in two stages: first treating solution containing water, nitric acid and hydrofluoric acid at a component ratio H2O: HNO3:HF, equal to (0.9 ÷ 1.1):(0.9 ÷ 1.1):(0.17 ÷ 0.23) followed by hydrogenation in the chamber containing hydrogen chloride in volume of 0.01-0.015% of chamber volume. Hydrogenation is conducted at an excess pressure of hydrogen in the hydrogenation chamber 1.1-2.0 atm until the hydrogen content in titanium 350-410 l/kg.EFFECT: increasing of yield of usable powder with granules rounded form 20-50 microns.1 tbl

onodisperse colloidal aqueous solution of silver ions with antimicrobial and antitoxic action (versions) and method of its production // 2609176
FIELD: nanotechnologies.SUBSTANCE: invention refers to the area of nanotechnologies and nanochemistry, particularly, to metal citrates, and it may be used in perfumery, food industry, in the medical field and agricultural sector, in biology, and other domains of science, industry, and ecology. The monodisperse colloidal aqueous solution of silver ions contains active metals in the form of citrates, silver ion reducer in aqueous dispersion, and distilled or deionized water. As an active metal, it contains monodisperse colloidal silver ion solution in aqueous dispersion. The reducer is selected from the group of organic acids, to the chemical composition of which the stabilizer of silver ions and hydrophobizator based on organic silicon compounds in aqueous dispersion were additionally included. The production method of monodisperse colloidal aqueous solution of silver ions has the stage of production of polydisperse colloidal mixture of nanostructural particles of silver in aqueous dispersion and direct interaction of obtained solution of nanostructural particles of silver in water with the reducer of silver ions with formation, whereupon, monodisperse colloidal aqueous solution of silver ions (cations) with antimicrobial and antitoxic action against toxic impurities and microbiological contaminations.EFFECT: inventions allows production of stable monodisperse colloidal aqueous solutions of silver ions (cations) in the presence of citric acid with their specific concentration in aqueous solutions with simultaneous antimicrobial and antitoxic action.9 cl, 6 dwg, 9 tbl, 5 ex
ethod of making high-porosity cellular material // 2609153
FIELD: construction.SUBSTANCE: method includes preparation of a suspension from a mixture of powders and a solution of an organic substance, application of the suspension onto a porous polymer material, drying of the finished stock, removal of organic substances from it by heating with subsequent sintering. Mixture of powders is prepared from ultrapure iron, alloyed with chrome in the amount from 5 to 20 wt % and ground to average particle size of 2-5 mcm, and ultradispersed powder of cobalt in the amount of 1.2-2.0 wt %.EFFECT: simplified process of production of a highly porous cellular material having necessary strength for transportation.1 ex

Solid phase particles dispersion in impregnating material // 2609114
FIELD: mining.SUBSTANCE: group of inventions relates to composite material for earth drilling bit. Method of composite material making involves mixing first component solid phase in form of carbide with binding agent, second component solid phase in form of porous carbide, having porosity of at least 1 % and containing from 0.1 wt% to 50 wt% of binder and methyl cellulose with production of mixture, loading of said mixture into mold, addition of metal carbide powder into said mold, addition of impregnating alloy into said mold, overheating of said impregnating alloy with provision of said solid phase second component decomposition in said impregnating alloy with production of first component solid phase dispersion and dissolved second component solid phase in said impregnating alloy and cooling of said dispersion with production of composite material. Earth drilling bit includes housing made from composite material.EFFECT: enabling higher resistance of composite material to erosion.26 cl, 10 dwg, 2 ex

Sintered material sintering device and method // 2608863
FIELD: technological processes.SUBSTANCE: group of inventions relates to sintered material sintering devices and methods. Sintered material sintering device contains sintered material bowl to be installed into furnace, mounted on support plate and having inner space for accommodation of sintered material as first inner space, it also contains enveloping bowl sleeve-shaped casing with sealed edge relative to support plate, forming inner space as second inner space, which is made with possibility to supply into it and remove from it of shielding gas with provision of eliminating sleeve-shaped casing lifting relative to support plate due to shielding gas excess pressure, wherein bowl is equipped with closing element, and first inner space is connected to second inner space by shielding gas flow.EFFECT: providing sintering at temperatures of 1,200 °C with no undesired sintered material colour changes or oxidation.17 cl, 3 dwg

Sand mold, method of making sand mold and core for casting metal // 2608861
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to foamed sand mixture used for making casting sand cores and foundry sand molds of aluminium or aluminium alloys. Mixture contains sand, water-soluble binding material, particles of inorganic compounds and foam formed by mixing said components with water. Particles of inorganic compounds can be separated when heating by fused metal at least one of water vapour or gaseous carbon dioxide. Solubility of particles of inorganic compounds in water is 100 mg or less in 1 l of water at 25 °C, and viscosity of mixture ranges from 0.5 to 10 Pa⋅s.EFFECT: use of foamed sand mixture simplifies removal of molds and cores from surface of cast article.23 cl, 4 dwg, 3 tbl, 7 ex

Processes and apparatus for forming products from atomised metals and alloys // 2608857
FIELD: metallurgy.SUBSTANCE: invention relates to systems and apparatus for producing products from atomised metals and alloys. Stream of molten alloy and/or a series of droplets of molten alloy are produced. Molten alloy is atomised to produce electrically-charged particles of molten alloy by impinging electrons on stream of molten alloy and/or series of droplets of molten alloy. Electrically-charged molten alloy particles are accelerated with at least one of an electrostatic field and an electromagnetic field. Accelerating molten alloy particles are cooled to a temperature that is less than a solidus temperature of molten alloy particles so that molten alloy particles solidify while accelerating. Solid alloy particles are impacted onto a substrate and impacting particles deform and metallurgically bond to substrate to produce a solid alloy preform.EFFECT: obtaining fine-grain homogeneous structure of workpieces.37 cl, 26 dwg

Process of continuous metal casting // 2608253
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Proposed method comprises casting using circular jet nozzle, arranged between casting device and mold. Nozzle in its upper part comprises canopy 2 for deviation of liquid metal, supplied to nozzle input, to its inner wall, limiting internal volume, in which there is no liquid metal. Powder with particle size less than 200 mcm is simultaneously supplied from feeder 11 through hole in canopy. Canopy 2 comprises means to supply powder without contact with canopy in form of hollow case 12. Case 12 has double wall 13, cooled with gas, and insulating layer 14.EFFECT: prevention of sticking or powder sintering at first facility.27 cl, 5 dwg
Cermet powder // 2608112
FIELD: metallurgy.SUBSTANCE: invention relates to cermet powder. Cermet powder comprises: a) 50 to 90 wt% of one or more solid substances and b) from 10 to 50 wt% of matrix metal composition. Weight percentages are related to total weight of cermet powder. Matrix metal composition contains: i) from 40 to 75 wt% of iron and nickel, ii) from 18 to 35 wt% of chromium, iii) from 3 to 20 wt% of molybdenum, iv) from 0.5 to 4 wt% copper. Said content of metals from i) to iv), in each case relates to total weight of matrix metal composition, and weight ratio of iron to nickel varies from 3:1 to 1:3.EFFECT: as a result powder forms, during thermal atomisation, durable coatings without significant losses of mechanical properties of wear resistance and cavitation stability or stability in presence of chloride.28 cl, 3 tbl, 3 ex

ethod of composite nano materials pulse die forging and device for composite nano materials pulse die forging // 2608006
FIELD: technological processes.SUBSTANCE: invention relates to foundry. Method involves obtaining melt from blank 3 arranged on male die 4 remelted by means of inductor 2, movement of male die 4 and female die 5 towards each other until collision. Melt is fed into compaction chamber and fills male die cavities under action of pulse pressure, made in form of holes in insert 7. Formed mini-ingots unit with press residue is removed from male die, placed in male die with press residue upwards and fill cavities, formed between unit mini-ingots, with new portion of melt under action of pulse pressure with solid billet formation. In addition, in insert openings rods are installed having diameter smaller than cavity diameter. On mini-ingots unit coating is applied for connection of units by transition layer.EFFECT: invention discloses method of composite nano materials pulse die forging and device for composite nano materials pulse die forging.4 cl, 4 dwg
ethod of producing electrodes from nickel aluminide-based alloys // 2607857
FIELD: metallurgy.SUBSTANCE: invention relates to special metallurgy, in particular to production of cast charge workpieces of electrodes from highly doped nickel aluminide-based alloys, and can be used for centrifugal atomization of electrode material and production of granules for use in addition 3D technologies in order to obtain complex-shape articles from refractory metal materials. Method of producing electrodes from nickel aluminide-based alloy includes production of semi-finished product by centrifugal SHS casting at centrifugal acceleration 60±10 g using a reaction mixture containing, wt%: nickel oxide 47.0–49.1, aluminium 28.6–32.4, mixture Cr2O3, Hf, B and Co3O4 as dopant 13.1–17.9, mixture Al2O3 and Na3AlF6 as functional additive 6.5–7.0, and further two-step remelting of semi-finished product to produce at first step a refined degassed ingot, and at second step – an electrode, wherein second step 2–3 minutes before pouring into melt, an ingot is added, consisting of pressed mixture of aluminium with modifying nanopowder with specific surface area 5÷30 m2/g and lumped aluminum, in an amount which provides content in melt of 0.5–7 vol% nanopowder, with further cooling to room temperature and extraction electrode from crystallizer. MoO3 is further added to mixture of dopant, modifying additive used in nanopowder is powder of one of WC, TaC, NbC, ZrO2, Y2O3, Al2O3.EFFECT: technical result of proposed invention is developing integrated technology of producing electrodes from nickel aluminide-based alloys.5 cl, 3 ex, 10 tbl, 10 dwg
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
 
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