Method for production of powder material on basis of titanium

FIELD: metallurgy.

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-2265
a mixture of technical powders PTM and Nickel NCPnot less than 30
the copper powder PMS-13 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.



 

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