Oxidation and sinter-resistant metal powders

Details Oxidation and sinter-resistant metal powders Oxidation and sinter-resistant metal powders

1976-02-06

1977-07-19

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 5AC, C22C 105, C22C 502

Patent

active

040366340

ABSTRACT:
A high density precious metal powder that resists sintering at 600.degree. C. and contains a very small percentage of titania or zirconia is produced by co-nucleation and precipitation of gold and titania from an ammoniacal solution at pH 3-4 with a bisulfite.
A nickel powder including a very small percentage of a refractory oxide such as zirconia is prepared by co-nucleation and precipitation from an alkaline solution with hydrazine.
Materials so prepared have oxidation resistance and sintering temperatures superior to the pure metal, and find utility in microelectronics as air-fired thick films. Nickel powders so prepared are also useful as hydrogenation catalysts and in other applications.

REFERENCES:
patent: 3390981 (1968-07-01), Hoffman
patent: 3771996 (1973-11-01), Short

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