Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1992-10-16
1995-02-28
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
419 38, 419 5, B22F 100
Patent
active
053934849
ABSTRACT:
A process for producing a sintered body, comprising inserting a separately formed first molded article in a mold for injection molding, injection-molding a material identical to or different from that of the first molded article in the mold so that the injected material and the first molded article form together a second molded article, degreasing the second molded article, sintering the degreased article thereby obtaining a sintered body having a difference in shrinkage during the sintering between the first molded article and the injection molded portion of the second molded article other than the first molded article portion being 5% or less. The resulting sintered body is useful as a magnet base.
REFERENCES:
patent: 4562092 (1985-12-01), Wiech, Jr.
patent: 5032352 (1991-07-01), Meeks et al.
Patent Abstracts of Japan, vol. 15, No. 174, Jul. 6, 1989 & JP-A-3-039405 (Mitsubishi Heavy Metal Ind KK), Feb. 20, 1991.
Patent Abstracts of Japan, vol. 15, No. 336, Aug. 26, 1991 & JP-A-3-130306 (Seiki Epson), Jun. 4, 1991.
Derwent Publications Ltd., London, Great Britain, AN 91-349234 & JP-A-3-232906 (Daido Tokushoko), Oct. 16, 1991.
Seyama Yoshihiko
Shimizu Yutaka
Chi Anthony R.
Fujitsu Limited
Walsh Donald P.
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