Cadmium-free silver and metal oxide composite useful for electri

Details Cadmium-free silver and metal oxide composite useful for electri Cadmium-free silver and metal oxide composite useful for electri

1985-11-15

1986-09-02

Andrews, Melvyn J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 19, 419 21, 419 23, 419 31, 419 54, B22F 316, B22F 702

Patent

active

046095250

ABSTRACT:
The composite according to the invention is prepared by milling an atomized silver, two metal oxide alloy powder dry or wet in a mill in order to reduce its particle size and deform its particle shape. Subsequently an internal oxidation of the powder is carried out in two stages, at a first temperature range between 673.degree. K. and 773.degree. K. for two to six hours and in a second temperature range between 873.degree. K. and 1073.degree. K. for 0.5 to 2 hours. The internally oxidized powder is pressed into molded parts and these are densified by sintering in a temperature range between 973.degree. K. and 1173.degree. K. in air or a neutral atmosphere and by coining.

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