The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 2000
Filed:
May. 17, 1999
Jun Kusui, Osaka, JP;
Kazuhiko Yokoe, Osaka, JP;
Kazuo Fujii, Osaka, JP;
Kyo Takahashi, Wako, JP;
Kosuke Doi, Wako, JP;
Hiroyuki Horimura, Wako, JP;
Hisao Hattori, Itami, JP;
Toshihiko Kaji, Itami, JP;
Yoshinobu Takeda, Itami, JP;
Koji Yamada, Itami, JP;
Toyo Aluminium Kabushiki Kaisha, Osaka, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A raw material for powder metallurgy contains at least 0.5 vol % and at most 10 vol % of alumina powder of which the sieve fraction with a sieve opening of 30 .mu.m is at most 0.1 wt %, and a remaining part of aluminum alloy powder. The moisture content of the alumina powder is at most 0.15 wt. % with respect to the alumina powder. Agglomeration of particles is thereby minimized or avoided. Highly reliable raw material for powder metallurgy having superior fatigue strength, impact resistance and wear resistance can be obtained. A method of preparing such a mixed powder raw material involves air classifying the powder materials, dry ball mixing the materials, and then annealing the mixed powder.