Plessey Incorporated

John A DeRosa

Anthony V Fraioli

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.

Oxidation and sinter-resistant metal powders

Oxidation and sinter-resistant metal powders and pastes

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.

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Queens Village, NY, United States of America

John A DeRosa