Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1992-06-03
1995-04-04
Mai, Ngoclan T.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
419 31, 419 33, 419 46, 75247, 75623, 252514, B22F 100, B22F 300
Patent
active
054035430
ABSTRACT:
Disclosed is a manufacturing process of an alloy material comprising a chromium component and a base component which comprises at least one element selected from tile group consisting of copper and silver, the manufacturing process comprising steps of: subjecting a chromium material with a carbon material to heat treatment; and manufacturing the alloy material using the chromium material treated at the heat treatment subjecting step and a raw material for tile base component. At the heat treatment subjecting step, the chromium material, mixed with 50 ppm to 5,000 ppm of the carbon material, is heated to a temperature within the range of 800.degree. C. to 1,400.degree. C. in a non-oxidizing atmosphere. According to this manufacturing process, the level of oxygen content in the alloy material are decreased to be not more than 200 ppm. The obtained alloy material can be used as a contact material for vacuum circuit breakers.
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IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 14, No. 2, Jun. 1991.
Majima Yoshiko
Okawa Mikio
Okutomi Tsutomu
Seki Tsuneyo
Sekiguchi Tadaaki
Kabushiki Kaisha Toshiba
Mai Ngoclan T.
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