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Production of hard alloy charge with hardening nanosized particles Hardening superhard nanosized particles and plasticiser substances are introduced successively in plasticiser solution. Excess amount of solvent is evaporated from obtained suspension at temperature some 30-50°C lower than that plasticiser decomposition so that its amount relative plasticiser substances does not exceed 10%.Thereafter, plasticiser is introduced in hard alloy powder mix. Mixing of superhard nanosized particles with solvent and evaporation of excess amount of solvent from suspension are conducted in cavitation field of ultrasound. |
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Device and method of fused metal pelletising Invention relates to powder metallurgy, particularly, to continuous production of aluminium pelletised powder. Proposed device comprises, primarily, of round water tank whereto water is fed tangentially via several horizontal nozzles arranged at different levels and shifted in circumferential direction. Tank water is swirled while water surface takes up a parabolic shape. First water nozzle is located at water surface area to produce water jet or water fan thereon. To pelletise fused metal, the latter is teemed from crucible to water fan formed by the first water nozzle. Note here that said first water nozzle is located above the level of weir, its position being selected to make angular shift between first nozzle and weir equal to at least 90 degrees. Pelletising proceeds without steam and pelletised particle ejection. |
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Invention relates to powder metallurgy, particularly, to iron-based composition and to production of diffusion-alloyed powder. Said diffusion-alloyed powder is produced by mixing iron powder or iron-based powder with alloying powder particles containing copper and nickel and heating produced mix in nonoxidising or reducing medium to 500-1000°C for 10-120 minutes for bonding of alloying powder particles with base powder surface. Granulometric composition of alloying powder particles of copper and nickel is such that D50 makes less than 15 mcm. Total content of copper and nickel makes at least 20 wt % at copper content over 4 wt % and Cu:Ni varying from 9/1 to 3/1. |
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Method and device for metal spun casting Proposed method comprises pouring of metal melt into spinning cooled mould composed by vertical converter, heating it in oxidative or reducing medium with formation of light and heavy admixtures by chemical reaction in the melt. Centrifugal forces and gravity displace light admixtures to melt surface while heavy admixtures get to ingot periphery. Volatile admixtures do not escape from the mould owing to application of cooled shield arranged there above. After crystallisation of the metal major part on mould inner surface said ingot is turned over to discharge melt portion along with light admixtures. Heavy admixtures are removed from hardened ingot periphery. Mould inner cavity is shaped top cone converging upward to allow removal of ingot after turning over of the mould with ingot. This mould is spun by air or water flow fed to turbine blades. Note here that, at a tome, the mould and ingot are cooled. |
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Bearing head for liquid metal teeming ladle pipe support Invention relates to metallurgy, particularly, to continuous metal casting. Manipulator bearing head comprises the means to adjust the ladle pipe orientation relative to bearing head about axis corresponding to tope channel axis (40). Said adjustment means represent at least one recess at bearing head interacting with ledge (52) made at the pipe. |
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Production of suspensions of metal and metal compounds superfine particles and device to this end Powder composed of aggregates of nano-sized particles is subjected to ultrasound dispersion and mechanically mixed at the rate of 250-1000 rpm. Mechanical mixing and ultrasound dispersion are carried out successively at displacement of suspension in closed hydraulic circuit at the rate of 0.06-0.15 m/s. Proposed device comprises high-speed mixer arranged in the case composed of round-bottom tank, ultrasound continuous flow chamber and means to force suspension in closed hydraulic circuit. Said mixer and said chamber are communicated via pipelines. |
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Fire-resistant building board and method of its production Invention relates to fire-resistant building boards and method of their production, namely to fire-resistant boards made of wool, produced by weaving thin metallic threads from waste cans, tin, iron, non-ferrous metals, etc. Invention consists in the production of fire-resistant building board made of wool, produced by weaving thin metallic threads from waste cans, tin, iron, non-ferrous metals, etc. |
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Charge for production of material for high-current contacts and method of its production Proposed composition contains the following substances, in wt %: copper particles - 20-85, titanium hydride particles - 1-10, graphite particles making the rest. To make material billet, this charge is sintered by feeding electric current pulses there through, current density making 200-500 A/mm2, with simultaneous single-axis reduction. |
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Method of gamma-aluminide titanium-based alloys production Proposed process comprises production of the mix of powders, forming the pellet therefrom and execution of self-propagating high-temperature synthesis. Obtained the mix of pure metals containing titanium, aluminium, niobium and molybdenum in the following amount, it wt %: aluminium - 40-44, niobium - 3-5, molybdenum - 0.6-1.4, titanium making the rest. This pellet is compacted to relative density of 50-85% and subjected to thermal vacuum processing at 550-560°C for 10-40 min, heating rate of 5-40°C/ min and pressure of 10-1-10-3 Pa while SPS is performed at initial temperature of 560-650°C. |
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Production of uranium nitride powders Proposed method comprises heating of metal uranium in evacuated reaction vessel at residual pressure of 10-1-10-2 mmHg and 250-300°C with subsequent feed of hydrogen to 750-800 mmHg. Uranium hydration is performed for time interval defined by preset formula. Reaction vessel with produced uranium hydride powder is subjected to evacuation another time at 220°C to residual pressure in reaction vessel of 10-1-10-2 mmHg. Nitration of produced uranium hydride is made in nitrogen flow at 250-300°C Pressure in reaction vessel is adjusted from 1 to 800 mmHg depending upon the change in area of powder reaction surface. |
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Injection moulding machine piston assy Piston assy comprises interconnected piston and rod, pipeline arranged with clearance in the rod lengthwise rod, pipeline with front end connected with the disc hollow stem, disc being arranged without clearance between ends of piston and rod and connected by stem with rod via thread and pin. Disc has crosswise openings open inside the stem cavity and into ring clearance there between. Crosswise openings are made in rod rear walls to extend in its lengthwise channel and bottom. Crosswise openings are made in rod front part to extend to lengthwise and ring channels with seal element connected by grooves with lateral ring clearance between disc and piston. Piston rear end has crosswise grooves to receive ledges at front end of sleeve fitted on the rod locked thereat. Rear end is locked by front end of nut-bush screwed on the rod. |
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Method of producing porous titanium nickelid oxide Invention relates to powder metallurgy, particularly, to continuous production of titanium powder alloys. It can be used in medicine for production of functionally-gradient implants. Powders of nickel and titanium are mixed at equiatomic amounts and compacted to pellets. Pellets are heated in vacuum at heating rate not exceeding 279 K/min to 950-1100 K, held at this temperature and cooled down with the kiln. Obtained cake is milled in ball mill at post critical rate in the medium of isopropanol for 40-48 hours and dried. |
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Mixture of niobium and aluminium powders with fineness of not less than 98% and fraction of aluminium of 1.5 to 45 wt % is subject to mechanical processing in a planetary ball mill at amplification of balls of 100 to 600 m/s2 with duration of 0.5 to 20 minutes. Compaction by twisting under quasi-hydrostatic pressure on Bridgman anvils is performed at the temperature of 10 to 100°C, pressure of 2 to 10 GPa and relative turn of anvils at twisting till shear deformation γ≥50 is achieved. |
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Invention relates to powder metallurgy, particularly, to production of hard alloy body from hard alloy containing tungsten carbide grains and metallic binder comprising cobalt with definite concentration of tungsten dissolved therein. Hard alloy body has bordering surface area and inner area. Note here that mean fraction of binder in inner area is larger than that in surface area. Note here that carbon concentration in the binder is larger in surface area than that in inner area. Note that hard alloy body does not contain eta-phase and free carbon. Concentration of tungsten dissolved in binder in surface area is smaller than that in inner area and defined as (16.1-σt)/0.275, where σt is quotient of had alloy body magnetic moment division by mass fraction of binder in this area. Hard alloy body is produced by forming of unsintered blank containing the tungsten carbide grains distributed in cobalt-containing binder, preliminary sintering at 1000-1280°C for 1-3 hours, thermal treatment in carburising medium and liquid-phase sintering at 1320-1400°C. |
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Production method of magnetic core of hoisting electromagnet Individual sectors of the housing are molten from steel with carbon content of 0.05-0.14% by a casting method as per gasified models. Sectors are connected to each other with lateral sides and welded along a junction line. A magnetic core is heat treated. |
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Thermostable ceramic composite Invention relates to metallurgy. A composite contains, wt %: a sol-gel product, synthesised by means of sodium silicate 20-30, a mixture of powder-like electrocorundum 20-30, pigment titanium dioxide 2-10, zirconium dioxide 2-10, talc 5-15, kaolin 20-30 and water - the remaining part. |
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Method of obtaining composite material al-al2o3 Method of obtaining a composite material Al-Al2O3 relates to a technology of composite materials - cermets and can be used for obtaining sealing elements, applied for tight connection of components and constructions in high-temperature power installations. In accordance with the claimed method an aluminium powder (grade PAP-2) is preliminarily thermally processed in air to remove stearine from the surface of its particles. After that, it is granulated by mechanical processing in a planetary mill for 15-180 minutes with a ratio of the powder weight to the weight of hard alloy spherical bodies from 1:20 to 1:25, thermal processing of the filler from the granules was performed in vacuum at a temperature of 500-600°C for 45-60 minutes with further pressing of the blank under pressure 400-600 MPA. The obtained blank was heated by an air heat carrier up to a temperature of 550-600°C to initiate the process of self-propagating high-temperature synthesis (SHS) with further isothermal exposure for 30-60 minutes and cooling of the heated product in air at room temperature. |
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Method of producing high-porosity casts Water soluble filler is heated in furnace and pouted in heated metal mould. After teeming the metal into the mould, filler is impregnated with the melt on exposure to centrifugal forces. Mould rpm is defined by the formula n = ( 200 ÷ 300 ) g 4 π 2 R , c-1, where R is cast revolution radius, m; g is acceleration of gravity, m/s2. Cast solidified, filler is removed with the help of running water and ultrasound oscillations applied to the cast. |
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Method of steel continuous casting and method of sheet steel production Continuous casting of steel with carbon content of 0.003 wt % or less is performed at the machine including two magnet top poles and two magnet bottom poles and immersible pipe with outlet directed downward at 10 degrees or more and smaller than 30 degrees. Fused steel flowing out from said pipe is decelerated by magnetic field of constant current applied to said top and bottom poles. In casting allowed for are steel chemical composition, gradient of tension at boundary layer ah hardening crust front surface to optimise DC magnetic field intensity in compliance with blank width. Said blank is subjected to hot rolling, etching and cold rolling to get hot rolled steel sheet. Time to cold rolling start and/or steel sheet surface maximum temperature is adjusted. |
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Method of adjustment for continuous casting mould melt heel Liquid metal feed to continuous casting mould is stopped by interlock. Partially hardened formed article is released from continuous casting mould with the help of unloading device. Measured actual casting level magnitude (hG) is fed to casting level controller. The latter uses said actual magnitude (hG) and appropriate preset magnitude (hG*) to define the interlock preset position (p*). Measured actual magnitude (hG) and appropriate preset position (p) are fed to disturbance compensator. Said compensator defines the expected magnitude (hE) for casting level to subtract it from said actual magnitude (hG). Difference (e) in said compensator is fed to differential regulator for it to define the regulator output signal (e'). Said regulator output signal (e') is multiplied by ON factor (k). Said regulator output signal (e') is multiplied by ON factor (k) as the disturbance compensation magnitude (z) is included in preset position (p*). Besides, regulator output signal (e') includes feed signal (Z) derived from actual position (p). Result of initiation of disturbance inside compensator (20) is fed to integrator, its output signal (hE) corresponding to expected magnitude (hE) for melt heel. |
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Method of making drill stem with help of geometrical compensation and drill stem thus made Set of inventions relates to drill stem and method of its production. Technical result is ensured by geometrical compensation used to perfect precision of elements location on drill stems formed by compaction and sintering. Drill stem body, not completely sintered, features cutting surface profile with shape differing from preset shape of cutting surface profile of completely sintered body formed from drill stem not completely sintered. In making the drill stem body, location error is forecast which will have at least one element of the set at drill stem body not completely sintered. At sintering the drill stem body not completely sintered to preset final density, at least one element is formed at the location at least partially defined by forecast location error which will exist in an least one element of the set, to sinter drill stem body not sintered completely to required final density. |
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Metal continuous casting mould and casting system Invention relates to metallurgy, in particular, to continuous casting of billets. Proposed device comprises fused metal feed system, mould assembly and ring of water sprayers. Metal feed system comprises nozzle with melt feed opening, gates arranged in circle at nozzle inner wall and inlet flute for melt feed in nozzle case inner flute. Mould assembly comprises casting ring, adapter plate and thrust ring. Interacting inclined surface are made at casting ring and adapter plate. Thrust ring serves to apply shifting force to adapter plate and automatically centre the latter relative to casting ring at thermal expansion of said elements. Separation plate is arranged between adapter plate and ring of water sprayers to change the mould length. |
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High-pressure moulding machine Invention relates to high-pressure moulding equipment. Proposed machine comprises high-pressure vessel arranged around high-pressure chamber with working medium, fan connected motor, housing wall section cooler, pump and guide. Housing is arranged inside said chamber. Fan is arranged in chamber outside said housing to circulate working medium contained thereon. Pump is designed to circulate fluid inside said housing by said housing wall cooled section. Said guide is located inside said housing to guard said motor. Said element has fluid inlet and outlet for motor cooling purposes. |
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Method of producing circular oxide compacted material Invention relates to powder metallurgy, particularly, to production of circular oxide compacted article. It can be used for production of catalyst stationary bed used in shell-and-tube reactor pipes. Powder material containing at least one metal compound to be converted into metal oxide by heat treatment, or at least one metal oxide , or at least one metal oxide and at least one metal compound, are placed in loading chamber. Mechanical compaction is performed to preform ring-like article with side surface shaped to truncated cone expanding upward. Preformed article is heat treated at ≥100°C to destruct and/or chemically convert the article components with production of gas compound and final ring-like oxide article. |
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Directional hardening of metal teemed in mould Proposed method comprises application of different-composition protective-separation coatings on the mould surface before teeming of fused metal. Coating, 0.1-0.2 mm thick, consisting of ultrafine powder of magnesium oxide in amount of 20-25 wt % and industrial oil in amount of 78-80 wt %. Coating, 0.2-0.3 mm thick, consisting of ultrafine powder of zirconium oxide in amount of 20-25 wt % and industrial oil in amount of 75-80 wt %. Coating, 0.3-0.4 mm thick, consisting of ultrafine powder of zirconium oxide in amount of 20-25 wt % and industrial oil in amount of 75-80 wt %. |
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Device for making ring ingots from magnesium alloy by spun casting in inert gas medium Device relates to production of nonferrous metals and can be used for production of billets for forming the pipe semis and whole-rolled billets and articles of magnesium alloys. Proposed device comprises smelting furnace, sealed chamber with inner medium, electrically heated metal duct composed of the bellows with one end arranged in said smelting furnace to produce fluid gate from metal melt and opposite end located in sealed chamber. Round rotary table is installed in the chamber to support cylindrical mould with cover and batcher barrel aligned with metal duct. Said mould is rotated with the help of said table engaged with drive shaft of the motor located outside said sealed chamber. |
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Adjustment of penetration of butts between retort parts in siliconising tool set Fusible gate is formed between retort parts of siliconising plant at butts on the side of its outer surface. Said fusible gate is formed in end recess while fusible gate material is composed by Si3N4-Si or Ti3SiC5-Ti Si2-Si, or TiSi2-Si.Said materials are produced by impregnating them or Si3N4-or mix of TiC and Ti, or Ti-based porous blanks formed at circular recess bottom to overlap the butt with the melt of silicon melt or its alloys with Cu and Al. |
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Perfection of machinability of metal powder alloys Invention relates to cermet cutting, particularly, to sintered porous cermet surface ply forming. Said material can be used for production of parts from antifriction materials used as self-lubing antifriction bearings incorporated with speedometers, starters, wipers, window raisers, borehole pumps, household hardware. Proposed method comprises removal of the part main machining allowance. Thereafter, the surface is subjected to effects of chemically active solution fed to cutting zone from activator tank filled with the solution. 28 V 2.4 A electric current is fed there through to allow the electrochemical etching. |
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Method of combined casting, rolling and forming and device to this end Fused metal is fed from mixer furnace to cooled rolls for metal to get crystallised at their surface. Crystallised metal is caught by rolls, rolled thereat and formed at female die. Forming comprises direct forming, angular forming and repeated direct forming combined with shaping of the finished article. Proposed device comprises roll with pass and roll with ledge to make working gage and female die arranged at gage exit. Grooves are made at roll smooth body while at least one L-like channel is made in female die. L-like channel consists of working part with square cross-section and gaging part with round cross-section. |
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Method and device for inoculation Invention relates to metallurgy and can be used for inoculation of grey iron or iron with globular graphite. Proposed method comprises initiation of plasma arc between the surface of said alloy and plasma torch cathode arranged in foundry distributor located ahead of mould line. Note here that said plasma torch comprises anode partially immersed in said foundry iron alloy and cathode located above the surface of said alloy to initiate plasma arc between said cathode and said surface. Note also that anode or cathode, or both comprise graphite that makes an alloy crystallisation dummy bar. |
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Injection nozzle for horizontal injection moulding plant Invention relates to metal forming, particularly, to steel strip production at horizontal strip casting machine. Injection nozzle to pout metal into the mould is composed of the narrow rectangular hollow block from refractory material including bottom, cover and two sidewalls. Nozzle outlet section is located slightly above the cooled endless strip whereon outflowing melt is fed. Hollow block finished section at outlet part decreases along the flow towards outlet. Bottom end side is arranged relative to endless strip surface to allow vertical feed on the melt onto endless strip. |
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Invention relates to powder metallurgy, particularly, to removal of wax from powder materials. One or multiple processed articles are heated in the kiln, cured for preset time interval at temperature higher than that of wax evaporation and lower that of article carbonisation. Adjustment is carried out on the basis of evaporation characteristics of organic binder. |
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Method of producing high-porosity materials Invention relates to powder metallurgy, particularly, to materials intended for production of laminate permeable materials. It can be used in medicine for production of functionally-gradient implants. Exothermal mix of powders of initial components is prepared at their ratio to ensure its self-maintained combustion to produce the granulation. Layer-by-layer compaction of the blank is performed at alternation of coarse and fine pellets at equal or different compaction pressure. Then, self-propagating high-temperature synthesis is carried out followed by cooling of produced material in vacuum. |
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Method of heap sand processing Invention relates to metallurgy. Fine granular component is removed from heap sand by application of electrostatic charges to carried heap sand. Said charges are generated by rubbing Plexiglas arranged above the conveyed heap sand flow with rotary brush. |
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Method of making 3d articles from composite materials Invention relates to powder metallurgy, particularly, to production of nano-structured materials. It can be used for production of complex shape parts from fine powders in various machine building branches. Powder composition components are laid layer-by-layer in reaction chamber to required topology. Preheating is made to prophase temperatures of composition or less refractory component of said composition by source that ensures heating of the entire volume of said powder composition. Thereafter, laser processing is performed for 3D sandwiched article under conditions that allow phase conversions. Now, produced model is withdrawn from the chamber with removal of powder composition not involved in forming of said 3D articles. |
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Article is processed by pulse laser with efficient pulse energy of 60-500 J, pulse power density of 1.2·1010-4.3·1011 W/m2, wavelength of 1.064·10-6 m, pulse duration of 0.8·10-3 s, beam diameter of 1.2·10-3-2.5·10-3 m and distance fro irradiated point to surface being hardened of 12-30 mm. |
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Hollow blank continuous casting machine mould mandrel Mould mandrel comprises hollow sleeve arranged at crossbar and having vertical coolant channels. Through vertical grooves are arranged regularly over sleeve bottom edges. Width of said vertical through grooves does not exceed 2 mm. Sleeve inner surface is shaped to polyhedron, every face being arranged between said vertical through grooves. At replacement of steel teeming ladle, blank drawing rate is increased. Besides, blank temperature decreases while shrinkage increases, both being compensated for by sleeve flake resilience. After recovery of casting initial parameters, blank surface temperature increases to decrease said shrinkage so that blank flakes acquire initial shape. |
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Proposed mix contains the following components, in wt %: metal aluminium - 25-38, calcium fluoride - 18-35, aluminium oxide - 6-13, ferrotitanium - 12-22, silicobarium - 8-17, coal dust - 1-5. |
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Method and device for production of high-quality metal Invention relates to metallurgy. Disc blank is placed on the mould to fuse it by inductor at retaining the blank side surface in suspended state. Mould top part is shaped to truncated cone while mould bottom features the same cone but continued to geometrical cone vertex. Conical insert made from pre-purified metal is fitted in cavity between said disc and said mould to close the mould inlet. Blank is fused from periphery to form the conical front. All light inclusions are displaced to cone vertex while heavy inclusions are collected at cone bottom to get frozen in wall accretion. At bottom drain, pure melt only flows in the mould while dirty melt stays on the mould which is detached after production of the ingot. |
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Invention relates to the field of metallurgy. The device (10) comprises the main stem (16), which controls opening and closing of the valve, a facility (40) to connect the main stem (16) with the valve and a facility to control remotely the facility (40) of connection, making it possible to activate and deactivate the connection facility. The facility to control the connection facility comprises a connecting piston (62), connected with the connection stem (64). The end (66) of the connection stem makes it possible to activate and deactivate the facility (40) of connection due to sliding of the piston and the connection stem. |
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Invention relates to method of binding non-monolithic inorganic materials by hardenable compositions, as well as to hardened compositions, which can be obtain by claimed method. Method consists in performing contact of inorganic materials with hardenable composition, which contains, at least, one hardenable etherified carbamide-formaldehyde resin, which contains certain structural units, with further thermal resin hardening. Amount of hardenable composition constitutes from 0.5 to 60 wt % counted per inorganic materials, and hardening is performed at temperature from above 0 to 280°C. |
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Production of thin-wall casts from iron alloyed with aluminium Invention relates to metallurgy. Pellets of thermite mix including minced aluminium additives with coat ply containing calcined iron oxide is placed on ladle bottom prior to filling iron melt into ladle. Not over one third of pellets are located nearby ladle edge, one third of pellets are arranged at maximum spacing from said edge and one third is arranged at maximum spacing from the ladle. Diameter of pellets located nearby ladle edge makes less than 50% of diameter of pellets located at ladle centre while that of pellets spaced from said edge is four times and more larger than diameter of pellets at ladle centre. |
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Method and device for production of moulded products Invention relates to metallurgy. Melt is filled in the mould. Said mould is partially withdrawn from hardened cast. Hardened cast is placed on cooling chamber bed while mantle is arranged at said bed to make cooling chamber surround said hardened cast. |
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Mandrel of a crystalliser comprises a conical cartridge 1, having vertical supply and drain channels 2 to let cooling water through, installed on a cross beam 3, via channels of which cooling water is supplied into the cartridge. In the lower part of the cartridge there are through vertical slots 4 arranged evenly along the perimeter and forming cantilever "tabs" 5. The inner surface 6 in this part of the cartridge is made as conical, the length of the conical surface makes 0.1-0.2 from the slot length 4. The pipe 8 is installed coaxially to the cartridge 1 and may move along the axis by means of a hydraulic cylinder 9 of the axis. On the external surface of the pipe 8 there is a conical section 7, interacting with the conical section 6 of the cartridge 1. The travel of the pipe 8 does not exceed 0.5 of length of the conical section 6 of the cartridge 1. During movement of the pipe 8 as a result of interaction of conical sections 6 and 7 cantilever "tabs" 5 of the cartridge 1 are elastically deformed, and the taper of the external working surface of the cartridge is changed. |
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Method of obtaining gallium nitride Invention relates to production of gallium nitride and can be used in electronic, aerospace, hard alloy, chemical branches of industry to obtain highly pure nitride, applied for manufacturing products, which possess high luminescent properties, chemical and radiation stability, thermal stability, stability in aggressive media, stability of physical properties in wide ranges of temperature. Method of obtaining gallium nitride powder includes: preparation of exothermal mixture, consisting of element to be nitrided, gallium, inorganic azide - sodium azide and galloid salt - ammonium fluoride or ammonium chloride, and ignition of mixture in nitrogen environment under pressure, with obtained powder being used for preparation of exothermal mixture with sodium azide and galloid salt, carrying out four-fold synthesis and each time exothermal mixture is prepared from powder, obtained at the previous stage, with sodium oxide and galloid mixture. |
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Method to produce products from complex-alloyed powder heat-resistant nickel alloys Granules with size less than 100 mcm are produced by the method of plasma melting and centrifugal spraying of a rotary cast stock with speed of rotation more than 15000 rpm. Granules are degassed in a moving flow with mass feed of 10-50 kg/hr with simultaneous filling, vibration compaction and sealing of capsules. Hot isostatic pressing and tempering is carried out for 2-8 hours in a single-phase area by 2-30°C higher than the solvus temperature, speed of cooling during tempering is maintained as higher than 25°C/min. Ageing is carried out into two stages: for heat-resistant alloys - at 850-890°C and 740-780°C, and for high-strength alloys - at 800-760°C and 680-720°C. |
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Method to control process of crystallisation and device for its realisation Invention relates to metallurgy. The device comprises a vacuum induction furnace, a cylindrical container and a hydraulic press. The press comprises two hydraulic cylinders arranged coaxially with the container and each developing a force of 0.3 MN, a closing hydrauloc cylinder with a force of 3 MN, a multiplier and a high-pressure valve. Press-plungers of cylinders are installed as capable of opposite movement. Liquid metal at temperature above liquidus by 150-200°C, poured into a vacuumised container - a crystalliser from a vacuum chamber. The vacuum value in the container makes 0.2-0.3·10-5 mm of mercury column. The crystallising metal is exposed to pressure by press-plungers, which is increased with speed of more than 40 MPa/s to the value of 300-400 MPa. After compression of the metal by 10% they increase pressure with the same speed to value of more than 500 MPa, and metal is additionally compressed by 2.4-2.8%. Isostatic compression of metal is carried out until the metal cools down to 100-150°C. |
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Invention relates to metallurgy. Proposed method comprises pouring the melt into heated refractory mould, hardening of the cast between said mould and hollow cooled core, withdrawing of the cast from the mould and removal of said cast from the core. The mould is heated to metal fusion point. Metal cooled core with high wall heat conductivity is placed into the mould after its filling with the melt at the rate of 0.02-0.8 m/s. Cast hardening is performed at the rate of 1 mm/s. Cast is removed along with the core after hardening. Cast removal from the core at rod displacement in direction of its extraction. |
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Pipe of bucket for pouring of liquid metal Invention relates to metallurgy. The bucket pipe comprises a channel (11), a metal shell (17), installed near the end section of the pipe, and facilities (20) of fixation to facilities of pipe movement. The metal shell (17) comprises a belt (18) with thickness more or equal to 10 mm, preferably, 14 mm. Fixation facilities are formed on the belt (18) of the shell (17). |
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Method to produce intermetallic compound ni3al Method to produce an intermetallic compound Ni3Al includes preparation of a powder mix of nickel with aluminium of stoichiometric 3Ni+Al composition, its placement in a die mould, heating of the die mould for initiation of the reaction in the mixture for self-propagating high-temperature synthesis SHS of the intermetallic compound Ni3Al in the mode of thermal explosion of the mixture and compaction for plastic deformation of the intermetallic product of the SHS reaction. The SHS reaction product is compacted with applied pressure of pressing to 400-500 MPa with time delay of 1-2 seconds at the moment of thermal explosion with extrusion of the SHS reaction product via one or several calibrated holes in the lower part of the die mould. The die mould has conical or cylindrical shape. |
Another patent 2513234.