Oxidation and sinter-resistant metal powders and pastes

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

1975-04-07

1976-06-29

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 5A, 75 5AC, 75118R, C22B 1104

Patent

active

039664635

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: 2424085 (1947-07-01), Bersteinsson et al.
patent: 3055840 (1962-09-01), Koch
patent: 3235515 (1966-02-01), Taylor
patent: 3252831 (1966-05-01), Ragan
patent: 3277020 (1966-10-01), Janakirama-Rao
patent: 3380934 (1968-04-01), Batzold
patent: 3573229 (1971-03-01), Herbst et al.
Poniatowski et al.; Gold Bulletin; vol. 5, No. 2, pp. 34-36; 4/1972.

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