Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1997-08-29
1999-05-04
Jenkins, Daniel J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75246, 192107M, B22F 324, C22C 2900
Patent
active
059005599
ABSTRACT:
In an aspect of the present invention, a synchronizer ring, made of Fe-based sintered alloy, having an internal circumferential surface 101, is provided, the internal circumferential surface 101 being adapted to detachably engage in synchronized sliding with a rotating counterpart member thereof. At least the internal circumferential surface 101 is applied with aqueous vapor treatment to form iron oxide film thereon. In another aspect of the present invention, the iron oxide film has surface roughness not less than 20 .mu.mRz but not more than 55 .mu.mRz. In a further aspect of the present invention, the iron oxide film has a surface roughness not less than 25 .mu.mRz but not more than 35 .mu.mRz. In another aspect of the present invention, the iron oxide film has a thickness not less than 0.05 .mu.m but not more than 5 .mu.m. In a further aspect of the present invention, the major component of the iron oxide film is Fe.sub.3 O.sub.4. In a still further aspect of the present invention, at least the internal circumferential surface is applied with blasting treatment in addition to, and in combination with, the aqueous vapor treatment to form iron oxide film thereon.
REFERENCES:
patent: 3802849 (1974-04-01), Kimura et al.
patent: 4943321 (1990-07-01), Akutsu
patent: 4951798 (1990-08-01), Knoess
patent: 5337872 (1994-08-01), Kawamura et al.
patent: 5370725 (1994-12-01), Kawamura et al.
Masuyama Tetsuo
Nakamura Yoshikatsu
Jenkins Daniel J.
Nippon Piston Ring Co. Ltd.
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