Cadmium-free silver and metal oxide composite useful for electri

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article

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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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