Method of preparing composite sintered body

Details Method of preparing composite sintered body Method of preparing composite sintered body

1995-04-18

1996-09-10

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 6, 419 30, 419 31, 419 32, 419 35, 419 36, 419 37, 419 38, 419 46, 419 53, B22F 702

Patent

active

055543383

ABSTRACT:
The invention relates to a method of preparing a composite sintered body having inner and outer portions fitted with each other. The method includes the steps of: (a) preparing an inner powder compact; (b) preparing an outer powder compact; (c) fitting the inner and outer powder compacts with each other so as to prepare a composite powder compact; and (d) sintering the composite powder compact so as to prepare the composite sintered body. The inner and outer powder compacts are respectively selected such that, during the step (d), the amount of growth of the inner powder compact becomes greater than that of the outer powder compact. Each of the inner and outer composite powder compacts is made of one member selected from the group consisting of a wax-type segregation prevention powder mixture and a metal-soap-type segregation prevention powder mixture. At least one of the inner and outer composite powder compacts is made of the wax-type segregation prevention powder. According to the method, the mechanical property of each of the inner and outer portions of the composite sintered body is not limited, and the bonding strength between the inner and outer portions is substantially high.

REFERENCES:
patent: 4054449 (1977-10-01), Dunn et al.
patent: 4503009 (1985-03-01), Asaka
patent: 4721598 (1988-01-01), Lee
patent: 4946499 (1990-08-01), Sakuranda et al.
patent: 5279640 (1994-01-01), Ogufa et al.
patent: 5368630 (1994-11-01), Luk
"Funmatsu Yakin Gairon", pp. 84-87, Shoji et al., published by Kyoritsu Shuppan Co. 1984.

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