Method for production of powder material on basis of titanium
SUBSTANCE: mixture is prepared containing maximum 65 wt % of powder produced by plasma spraying of the titanium alloy VT-22, at least 30 wt % of mixture of technical powders of titanium PTM and nickel PNK in ratio 1:1, and 3-5 wt % of received by electrolysis copper powder PMS-1 with size 50 mcm. The produced mixture is pressed at pressure 800-1000 MPa, then sintering in vacuum at temperature at least 900°C for over 1 h is performed.
EFFECT: material production on basis of titanium with high strength.
1 tbl, 1 ex
The invention relates to the field of powder metallurgy and can be used for powder materials based on titanium.
In industry widely used powders of titanium and its alloys to produce products of wide application. Various methods of obtaining titanium powders: metallothermic recovery of titanium from its compounds, electrolytic production, mechanical and chemical-mechanical grinding spongy and compact titanium.
A method of producing titanium powder miniaturizes recovery of the chlorides of titanium, including a preliminary purification of the resulting reaction mass high temperature vacuum separation to the content of magnesium chloride 5-12, grinding it to a particle size of the powder fractions 0-12 mm, and final cleaning powdered reaction mass from volatile impurities by high-temperature vacuum separation, or hydrometallurgical processing (patent RF №2061585, IPC B22F 9/18, C22B 34/12, publ. 10.06.1996).
The disadvantage of this method is the complexity of its implementation due to the use of special equipment for the cleaning of the reaction mass.
The known method of mechanical milling of titanium sponge, apply only for his low grades, i.e. titanium, krupenko high content of impurities, POS�ol'ku pure metal is very soft, viscous plastic (Ustinov B. C., Olesov Y. G., Drozdenko A. and others V. Powder metallurgy of titanium. Ed. 2nd, M.: metallurgy, 1981, p. 10-22).
Obtained by this method, the powders are of low quality.
As a prototype adopted a method of producing a powder material based on titanium, comprising preparing a mixture of the ligature Ti+Al and pure metals Mo, Zr, V, pressed powder pellets at 900 MPa, sintering at a temperature 1100-1430°C and exposure for 2-7 hours. The resulting powder of alloy VT-20 contains 6-7% Al, 1-2% Zr, 1-2% Mo, 1-2% V, Ti - else. Conducting sintering at temperatures up to 1300°C for this composition does not provide for the dissolution of alloying elements, increasing the sintering temperature up to 1400-1430°C leads to the complete dissolution of alloying elements (Antsiferov V. N., Ustinov B. C., Olesov YG Sintered alloys based on titanium. M.: Metallurgy. 1984, pp. 116-117).
The disadvantage of the prototype is the low strength of the powder material obtained even at a temperature 1400-1430°C, due to the high Al content, i.e., upon dissolution of aluminum in α-titanium is formed fragile α2-phase, which leads to a decrease in the quality of the material obtained.
The technical result of the claimed invention to provide a powder material based on titanium with high strength, suitable for making children�LEU machines and mechanisms for special purposes.
Said technical result is achieved in that in the method of producing a powder material based on titanium, comprising preparing a mixture of components containing titanium, compressing the mixture and sintering, according to the invention as starting components used powder obtained by the method of plasma spraying of alloy VT-22, a mixture of technical powders of titanium PTM-1 and Nickel PNK, taken in the ratio 1:1, and obtained by electrolysis of the copper powder particles less than 50 microns, the mixture is prepared by providing the following ratio of components, wt. %:
the powder of alloy VT-22 is not more than 65;
a mixture of technical powders PTM and Nickel not less than 30 NCP;
the copper powder PMS-1 from 3 to 5,
pressing the cooked mixture is carried out at a pressure of 800-1000 MPa, and then subjected to sintering in vacuum at a temperature of at least 900°C over 1 hour.
One of the most popular alloys is titanium alloy VT-22, containing titanium, aluminum, molybdenum, tungsten, iron, chrome, powder metallurgy allows waste from primary production to obtain a powder of alloy VT-22 by plasma spraying, but turn out dense, spherical particles of the powder to obtain a powder material by means of a single pressing and sintering. The use of special methods of obtaining powder materials on the OS�ove alloy VT-22 (hydrostatic pressing and sintering) significantly increases the cost of products (Powder metallurgy of titanium alloys. Collection of research papers edited by F. H. Rosa and J. E. Sagarese. M.: Metallurgy. 1985, p. 110-111).
The use as components in the mixture prepared in addition to the powder obtained by the method of plasma spraying of alloy VT-22, technical powders of titanium and Nickel grades PTM, NCP, and copper powder PMS-1 particles less than 50 microns during compaction allows to improve the adhesion of the powder particles among themselves and to change the structure of the powder material, by introducing into the composition of the technical mixture of powders of titanium, Nickel and copper with a developed surface, which is associated with the method of obtaining them (mark PTM - titanium powder obtained hydride-calcium method; mark the NCP - Nickel powder, carbonyl received method; ICP-1 - the copper powder produced by electrolysis of copper salts). Thus obtaining a powder material having high strength is achieved by the observance of the mixture in the claimed ratio of the components and operations of pressing and sintering at specified intervals of pressure and temperature.
Holding pressing at a pressure of less than 800 MPa, and sintering at a temperature below 900°C allows to obtain a high strength of the samples due to the lack of interaction of particles of the powder material, increasing the pressure above 1000 MPa is inappropriate, as it does not give�further improving the strength.
The proposed method is as follows: the powder obtained by plasma spraying of titanium grade W-22 particles less than 100 microns, is mixed with the technical powders of titanium and Nickel grades PTM and NCP particles less than 100 microns, in the ratio 1:1, and the copper powder PMS-1, obtained by electrolysis, particles less than 50 microns. After preparation of the claimed composition. %: powder of alloy VT-22 is not more than 65; a mixture of technical powders PTM and Nickel not less than 30 NCP; the copper powder PMS-1 from 3 to 5, spend a single pressing at 800-1000 MPa in a sectional mold and sintering the product in a vacuum with a pressure of 10-3MPa at a temperature of at least 900°C over 1 hour, followed by furnace cooling the powder material.
The method is tested in laboratory conditions.
Example. For the preparation of the powder material used the original components of the following composition:
Preparing a mixture consisting of powder VT-22, powder PTM and the NCP, of size less than 100 μm and a copper powder, 50 µm fraction. The ratio of components in the mixture ranged, wt. %: powder of alloy VT-22 60-70, a mixture of technical powders PTM and Nickel NCP 30-40, the copper powder from 3 to 5, the ratio of PTM to the NCP from 1:3 to 3:1, the particle size of copper powder +50 μm -50 μm. After cooking, the mixture was subjected to pressing at 800-100 MPa in a sectional mold the obtained pellets were sintered in vacuum with a pressure of 10-3MPa at a temperature of at least 900°C for 1-2 hours and then held in a furnace cooling the powder material.
The results of experiments to obtain the powder material and its properties (the density and strength of sintered briquettes) are shown in the table.
The table shows that the powder brand VT-22 with no additives powders PTM, NCP and ICP-1 is not pressed. The powder mixture on the basis of the VT-22 with additives PTM and NCP without copper powder PMS-1 is pressed, but has disadvantages in the form of a fraying edge.
The optimum composition of the powder material based on titanium is the initial mixture of powders of alloy VT-22, powders PTM and NCP in the ratio 65-15-15 with the addition of 5 wt. % of copper powder particles less than 50 microns. The obtained powder material contains, wt. %: Ti - 73,5-75; Ni - 15; Cu - 3-5; Fe - 0,5-1,0; Cr - 0,5-1,5; Various - 2,6-4,0; V - 2,1-4,0; Mo - 1,8-3,5; C≤0,02, O≤0,2, N≤0,03, H≤0,01.
Powder material of the same composition with the addition of copper powder fraction larger than 50 μm is almost 2 times less than the voltage of destruction, similar to the composition: W-22-PTM-NCP = 60-10-30 without addition of copper powder, and composition: W-22-PTM-NCP = 60-20-15 with the addition of copper powder 5 wt. % particles less than 50 microns.
The increase of the additive alloy VT-22 above 65 wt. % reduces the quality of the pressing, and hence the sintered material.
Powder mixtures with additives for�osca copper less than 3 wt.% and more than 5 wt. % copper have properties on the stress fracture lower than these limits.
The proposed method allows to obtain a powder material based on titanium with high strength, suitable for the manufacture of machine parts and mechanisms for special purposes.
The results of determining the density and strength of sintered samples.
A method of producing a powder material based on titanium, comprising preparing a mixture of components containing titanium, compressing the mixture and sintering, characterized in that the prepared mixture of components containing powder obtained by the method of plasma spraying of titanium alloy VT-22, a mixture of technical powders of titanium PTM and Nickel PNK, taken in the ratio 1:1, obtained by electrolysis of the copper powder PMS-1 particles less than 50 microns, with the following ratio of components, wt.%:
|the powder of alloy VT-22||65|
|a mixture of technical powders PTM and Nickel NCP||not less than 30|
|the copper powder PMS-1||3 to 5,|
pressing the cooked mixture is carried out at a pressure of 800-1000 MPa, and then subjected to sintering in a vacuum Bo�it 1 hour at a temperature of at least 900°C.
FIELD: technological processes.
SUBSTANCE: invention relates to rolling and may be used in manufacturing of armoured sheets from (α+β)-titanium alloy. The method to manufacture armoured sheets from (α+β)-titanium alloy includes preparation of charge, melting of a bar with the following composition, wt %: 3.0-6.0 Al; 2.8-4.5 V; 1.0-2.2 Fe; 0.3-0.7 Mo; 0.2-0.6 Cr; 0.12-0.3 O; 0.010-0.045 C; <0.05 N; <0.05 H;<0.15 Si; <0.8 Ni; balance - titanium. Further the bar is shaped into a slab, which is mechanically processed and rolled for semi-finished rolled products, the semi-finished rolled products are cut into stocks and rolled in stages for sheets, and then thermal treatment is carried out.
EFFECT: sheets are characterised by high strength and ballistic properties.
3 cl, 2 dwg, 3 tbl
SUBSTANCE: invention refers to metallurgy, particularly to titanium alloys with enhanced ballistic and mechanical properties. Titanium alloy includes mainly the following components, wt %: aluminium 4.2-5.4, vanadium 2.5-3.5, iron 0.5-0.7, oxygen 0.15-0.19, and the rest is titanium.
EFFECT: titanium-based alloy obtained from recycled materials shows minimum ballistic limit V50 of ca 1848 ft/sec, and high characteristics of yield strength, tensile strength and elongation.
23 cl, 6 dwg, 4 tbl, 1 ex
SUBSTANCE: invention relates to metallurgy, in particular to welded Ti based cast alloys, and intended for manufacturing of the shaped castings of valves, pumps, bodies used in shipbuilding, chemical and other industries. Ti based alloy contains in wt %: 3.0-4.5 Al, 0.02-0.14 C, 0.05-0.14 O, 0.02-0.25 Fe, 0.02-0.12 Si, 0,02-0,15 W, 0.001-0.005 B, Ti and admixtures - rest. Ratios are met: C+O2 ≤ 0.20, 2(V+Fe+Si)/Al ≤ 0.20.
EFFECT: alloy is workable, has good cast properties and set of mechanical properties ensuring operation reliability.
2 tbl, 1 ex
SUBSTANCE: invention relates to metallurgy, namely to titanium materials with high strength and processibility. Titanium material contains iron 0.60 wt % or less and oxygen 0.15 wt % or less, titanium and inevitable impurities are the rest. Material has a non-recrystallised structure formed by processing accompanied by plastic deformation and a recrystallised structure formed by annealing after the above treatment; average size of recrystallised α-grains is 1 mcm or more and 5 mcm or less, and surface area of the non-recrystallised part in a cross section of titanium material is more than 0 to 30%.
EFFECT: material is characterised by high strength and processibility.
2 dwg, 2 tbl, 45 ex
FIELD: process engineering.
SUBSTANCE: invention relates to production of long articles from titanium or its alloy or blanks of such articles. Proposed method consists in preparation of titanium or titanium alloy mix (10), melting said mix by electric arc at scull melting (20), casting of one or several ingots, primarily cylindrical in shape, in diameter smaller than 300 mm from said fused mix (30). Then, said ingots are drawn at 800-1200°C at draw bench (40) for application in, for example, aircraft engineering.
EFFECT: higher quality, simplified production.
13 cl, 3 dwg
SUBSTANCE: alloy contains the following, wt %: titanium 46.3-48.8; aluminium 0.14-2.87, calcium 0.06-1.24; magnesium 0.08-1.61; and iron is the rest.
EFFECT: reducing activation time and increasing alloy sorption capacity.
SUBSTANCE: method to produce titanium blanks involves placement of titanium sponge particles in a press chamber, compaction of the sponge particles to produce a blank, its pressing, removal of dirt from the pressed blank surface, its covering with grease and following rolling. Prior to placing the titanium sponge particles in the press chamber they are heated in a vacuum heating furnace up to the temperature of 700-800°C, alloyed by hydrogen up to the concentration of 0.1-0.9 wt %, then the temperature in the furnace is reduced to the temperature not lower than 300°C, compaction is carried out under the temperature of 300-700°C, compacted blanks are pressed by semicontinuous method via a matrix under the temperature of not more than 700°C with reduction ratio of maximum two and then under the temperature of not more than 700°C and the reduction ratio of maximum three, the blanks are rolled under the temperature of not more than 700°C, with following annealing in vacuum under the temperature of not less than 700°C.
EFFECT: possibility to process hardly deformable titanium under lower temperatures, improved mechanical properties of produced blanks.
SUBSTANCE: titanium aluminide alloy Ti3Al contains, wt %: Al 13-15, Nb 3-6, V 2-4, Zr 0.5-1.0, Mo 1-3, Sn 0.5-3, Si 0.1-0.3, Ti - the rest. A titanium aluminide alloy Ti3Al blank is subject to thermal hydrogen processing by hydrogen saturation followed by vacuum annealing. The hydrogen saturation of the blank is carried out to the concentration of 0.4-0.6 wt % at two stages, and then the blank is rolled. Vacuum annealing is two-staged at residual pressure no more than 5·10-5 mmHg.
EFFECT: heat-resistant titanium aluminide alloy Ti3Al is characterised by high plasticity and heat-resistance.
2 cl, 1 tbl
SUBSTANCE: 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.
EFFECT: preset shape of casts, high mechanical properties.
2 dwg, 2 tbl, 2 ex
SUBSTANCE: proposed alloy features density at a room temperature of not over 4.2 g/cm3, solidus temperature of at least 1450°C, the number of phases α2 and γ at 600-800°C making at least 20 wt % and at least 69 wt %, respectively. Total quantity of said phase makes at least 95 wt % while niobium content in γ-phase makes at least 3 wt %. Proposed method consists in that said γ-TiAl alloy containing niobium in amount of 1.3 or 1.5 at. % and transition metals selected from chromium in amount of 1.3 or 1.7 at. % and zirconium in amount of 1.0 at. % is subjected to hot isostatic forming. Said forming is combined with annealing at 800°C and holding for 100 hours.
EFFECT: low density, stable phase composition at operating temperatures.
2 cl, 2 dwg, 4 tbl, 1 ex
SUBSTANCE: invention relates to the metallurgy, namely, to production of cast aluminium-matrix composite alloys. The method includes aluminium melting, addition to the melt portions of exothermic charge containing titanium and carbon powders, melt mixing, at that prior to addition to the melt the exothermic charge is granulated using the binding agent being flux out of fluorine rubber with production of the granules 0.2-6.0 mm, and content of dry fluorine rubber 1-2%, the produced granules are added to the melt by portions in the aluminium foil with thickness 0.2-0.5 mm, after charge addition the melt is held for at least 5 minutes.
EFFECT: flux and artificial granulation use makes easier addition of the charge to the melt, increases degree of charge components recovery in the melt, and uniform distribution of the synthesised particles of the strengthening phase in the matrix alloy.
1 ex, 1 tbl, 2 dwg
SUBSTANCE: invention relates to powder metallurgy, in particular to the methods of production of high porous cellular materials (HPCM) intended for use as filters, acoustic absorbers, catalyst carriers, heat exchange systems, structural materials working under high temperatures, and can be used in power engineering, machine building, chemical and other industries. The method includes preparation of suspension of the mixture of powders based on chromal, the suspension application to the porous polymer material, the organic substances removal by heating with production of the blank, the blank sintering, at that on the blank after its sintering the chrome oxide Cr2O3 is applied, and secured in volume and on surface of the blank cell by sintering.
EFFECT: increased catalytic reactivity and durability of the material.
4 cl, 1 ex
SUBSTANCE: method of producing a multilayer nickel- and aluminium-based composite includes mechanical processing of a mixture of metal powders in a ball mill in an inert atmosphere and compacting by twisting under quasi-hydrostatic pressure on Bridgman anvils. The starting material used is a mixture of nickel and aluminium powders with purity of not less than 98% with aluminium content of 5-50 wt %. The powders are processed in a planetary ball mill with ball acceleration of 100-600 m/s2 and duration of 0.5-10 min. Compacting is carried out at temperature of 10-100°C, pressure of 2-10 GPa and relative turning of the anvil while twisting until achieving shear deformation γ≥50.
EFFECT: material is characterised by a inter-phase boundary area, which increases hardness thereof.
3 dwg, 1 ex
SUBSTANCE: group of inventions relates to a process of producing organic substrate particles bonded to switchable ferromagnetic nanoparticles with a mean particle diameter ranging from 10 to 1000 nm, to the use of such nanoparticles for hyperthermic treatment of an organism and to a drug for the hyperthermc treatment. As the ferromagnetic nanoparticles used are nanoparticles, which are non-ferromagnetic at first, but become ferromagnetic when the temperature is lowered, these initially non-ferromagnetic dispersed nanoparticles are bonded to the organic substrate particles, and then the nanoparticles bonded to the substrate particles become ferromagnetic as a result of the temperature decrease, initially the switchable ferromagnetic nanoparticles at the temperature of 22°C or higher are not ferromagnetic and become ferromagnetic as a result of cooling down to the temperatures below 22°C. The switchable ferromagnetic nanoparticle comprises Mn and additionally Fe and/or As and preferably have the Fe2P-structure or Na-Zn-13-structure, alternatively, or may comprise La, Fe and Si.
EFFECT: invention prevents the agglomeration of particles and an increase in the mean particle size.
10 cl, 1 dwg, 2 ex
SUBSTANCE: invention relates to powder metallurgy, in particular to powder production for application of wear- and corrosion-resistant coatings with high adhesive and cohesive strength by method of cold gas-dynamic spattering. The composite nanostructured powder for coatings application by the method of cold gas-dynamic spattering comprises particles containing metal core out of Hadfield steel, clad layer with thickness 4-8 mcm out of aluminium powder, diffusion layer out of intermetallic compounds with thickness 0.6-1.2 mcm created at border of the core and clad layer during annealing, and reinforced surface layer created during interaction of the clad layer and oxide reinforcing agent comprising nanoparticles 10-100 nm, at that the volume share of the oxide reinforcing agent in the clad layer is 30-40%.
EFFECT: coatings made from the suggested composite nanostructured powder have high adhesive and cohesive strength, uniform hardness distribution through the coating cross-section.
SUBSTANCE: invention relates to powder metallurgy of aluminium-based alloys used in journal bearings. A method for obtaining an antifriction wear-resistant alloy on the basis of aluminium involves obtainment of a mixture of pure powders of aluminium and stannum, which contains 35-45 wt % stannum, formation of briquettes with porosity of 12-18%, their sintering in a noncorrosive atmosphere at the temperature of 585-615°C during 45-60 minutes with further angular pressing of a sintered alloy so that orientation of a material flow plane is maintained during plastic processing at deformation intensity of at least 100%.
EFFECT: providing maximum wear resistance of an alloy at dry friction.
4 dwg, 1 tbl
SUBSTANCE: method of calciferous babbit manufacturing includes melting of mixture of lead with reducing agent and mixture of salts. Lead is melted at temperature 650-790°C with reducing agent in mixture of salts containing calcium chloride, sodium chloride, potassium chloride in ration 1:(0.3-0.6):(0.05-0.12) with production of calciferous alloy melt. Then the alloy is cooled to 550-640°C, natrium-lead alloy, stannum are added, and the produced babbit is poured.
EFFECT: simple production of babbit alloy per one operation at same equipment at more close temperature, exclusion of calcium and natrium losses.
4 cl, 1 tbl, 2 ex
SUBSTANCE: invention relates to material for cables based on aluminium alloy and to a method for its obtaining. Aluminium-based alloy contains the following, wt %: 0.3-1.2 Fe, 0.03-0.10 Si, 0.01-0.30 rare-earth elements Ce and La, inevitable impurities - less than 0.3 and aluminium is the rest; content of Ca in impurities is 0.02%, and content of any other impurity element - 0.01%. An alloy obtaining method involves preparation of a melt by melting of 92-98 weight parts of aluminium melt containing 0.07-0.12% Si and 0.12-0.13% Fe, and 0.73-5.26 weight parts of Al-Fe melt with content of Fe of 20-24%, heating of melt to 720-760°C, addition of 1-3 weight parts of Al alloy - 9-11% rare-earth elements Ce and La and 0.17-0.67 weight parts of Al alloy - 3-4% B, addition of 0.04-0.06 weight parts of a refining agent and refining during 8-20 minutes, exposure at the temperature during 20-40 minutes, casting and further semi-annealing at the temperature of 280-380°C during 4-10 hours with natural cooldown to ambient temperature.
EFFECT: conductor made from aluminium alloy has a high degree of elongation and has good safety and stability at application.
6 cl, 4 ex
SUBSTANCE: invention relates to metallurgy, and namely to magnesium alloy suitable for use at high temperature. Method for magnesium alloy production includes magnesium or magnesium alloy melting with creation of the liquid phase, addition of 0.5-4.0 wt % of CaO to the melt surface, surface mixing ensuring in principle complete consumption of CaO in magnesium, creation of calcium compounds (Ca) with metal or other alloying elements in magnesium alloy and melt solidification.
EFFECT: alloy has high mechanical properties at high temperature.
16 cl, 15 dwg, 5 tbl
SUBSTANCE: invention relates to metallurgy, namely to manufacturing of the cast composite material (CCM) based of Al alloy to manufacture cyclic and thermal loaded to 230°C aviation parts - blades of fans and LP compressor stages of advanced aviation engines and gas transfer units. The cast composite material based on Al alloy of Al-Cu-Mg-Ag system contains reinforcing discrete ceramic parts of Al oxide with grain size 10-100 nm in amount 0.2-10 % by volume and Ti diboride with grain size 0.5-1.5 micron in amount when Ti content in alloy is 0.1-0.2 wt %. Method of CCM manufacturing includes manufacturing of modified Al-Ti-B foundry alloy by means of dry mechanical and friction treatment in grinding and mixing device of the coarse powder or shaving of Al-Ti-B foundry alloy selected from row AlTi3B1, AlTi5B0.2, AlTi5B0.6, AlTi5B1, injection of the specified quantity of the discrete ceramic particles of Al oxide with grain size 10-100 nm, mixing until reception of the uniform consistency, further high energy machining of the received mixture, its briquetting using the cold isostatic pressing under pressure 200-400 MPa to achieve density exceeding 60% of the theoretical density, the received brickets supply to the melted Al alloy of Al-Cu-Mg-Ag system overheated to 750-850°C, holding at specified temperature for 20-60 minutes, pouring with solidification rate at least 70 K/s, and final heat treatment by homogenising annealing at 450-500°C for 2-24 hours, heating to 510-520°C with holding for 1-5 hours, water quenching and further artificial ageing at 190-250°C for 2-10 hours.
EFFECT: increased high temperature strength and crack strength of CCM due to uniform distribution of nm size ceramic particles of Al oxide in the casting volume.
FIELD: process engineering.
SUBSTANCE: invention relates to hot forming, particularly, to hot isostatic forming of articles. Proposed device comprises high-pressure vessel to accommodate furnace chamber to house articles to be processed. At least one guide channel connected with said furnace chamber makes an external cooling circuit. Note here that working fluid at section of said circuit is directed nearby high-pressure vessel walls and those of top end closing device before getting into furnace chamber.
EFFECT: fast and controlled cooling at hot isostatic forming.
6 cl, 7 dwg