C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/155
C22C 14/00 (2006.01) B22F 9/20 (2006.01) C22B 34/12 (2006.01)
Patent
CA 1174083
PROCESS FOR THE PREPARATION OF ALLOY POWDERS WHICH CAN BE SINTERED AND WHICH ARE BASED ON TITANIUM ABSTRACT OF THE DISCLOSURE The invention relates to a process for the preparation of alloy powders, which can be sintered and which are based on titanium, through the calciothermal reduction of the oxides of the metals forming alloys in the presence of neutral additives. The process is characterized by the fact that titanium oxide is mixed with the oxides of the other components of the alloy in amounts, based on the metals, corresponding to the desired alloy, alkaline earth oxide or alkaline earth carbonate is added in a molar ratio of metal oxides to be reduced to alkaline earth oxide or alkaline earth carbonate of 1 : 1 to 6 : 1, the mixture is homogenized, calcined at temperatures of 1000°C to 1300°C for 6 to 18 hours, cooled and comminuted to a particles size of ? 1 mm; calcium is added in small pieces in an amount equivalent to 1.2 to 2.0 times the oxygen content of the oxides to be reduced, a booster is added as well in a molar ratio of oxide to be reduced to booster of 1 : 0.01 to 1 : 0.2, the reaction batch is mixed, the mixture molded into green compacts and filled into a reaction crucible which is closed off; the reaction cruci- ble is placed in a reaction furnace, which can be evacuated and heated, the reaction crucible is evacuated to an initial pressure of 1 x 10-4 bar to 1 x 10-6 bar and heated to a temperature of 1000 C to 1300°C for a period of 2 to 8 hours, then cooled and - 1 - the reaction crucible is taken from the reaction furnace, the reaction product is removed from the reaction crucible and crushed and milled to a particle size ? 2 mm, the calcium oxide is then leached out with a suitable dissolving agent which does not dissolve the alloy powder, and the alloy powder obtained is washed and dried. The alloy powders obtained have a uniform composition of the structure, are free from segregations of oxides, nitrides, carbides and/or hydrides. They have high bulk and tap densities. The alloy powders can therefore be molded by isostatic hot molding to components approximating the desired contour. The alloy powders are particularly suitable for the manufacture of parts, subjected to high mechanical stresses in aircraft construction. - 1a -
377215
Buttner Gunter
Domazer Hans-Gunter
Eggert Horst
Goldschmidt Ag
Marks & Clerk
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