METHOD FOR PRODUCTION OF BILLETS FROM POWDERS OF HIGH-TEMPERATURE NICKEL ALLOYS Russian patent published in 1994 - IPC

FIELD: powder metallurgy. SUBSTANCE: method consists in filling powder into mold, heating in vacuum up to sintering temperature and holding at this temperature between liquidus and the solidus with subsequent cooling. Before filling, the initial powder is treated with complexon ammonium salts, mainly, of atpa^5- type or edta^4- type with concentration of 0.4-0.6 mole/l at 65-85 C for 20-40 min, heating within range of 20-300 C is carried out at rate of 16-20 deg/min, and from 1100 C to sintering point at rate of 5-9 deg/min, and holding at sintering temperature lasts 0.5-1 h. EFFECT: improved mechanical properties of products. 2 tbl