Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
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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Rothkegel Bernhard
Schreiner Horst
Andrews Melvyn J.
Siemens Aktiengesellschaft
Zimmerman John J.
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