Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1987-10-02
1989-06-06
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75237, 75241, C22C 3808
Patent
active
048368482
ABSTRACT:
An Fe-base sintered alloy for valve seats for use in internal combustion engines and a method of manufacturing the same are provided. The alloy consists essentially of 0.6 to 1.3% C, 1 to 5% Cr, 4 to 15% Mo, 0.5 to 2% Ni, 2 to 8% Co, 0.2 to 2% Nb, 0.2 to 2% at least one lubricating component selected from the group consisting of a CaF.sub.2 and BaF.sub.2 and the balance of Fe and inevitable impurities. Starting powders are blended into the same composition as above, and mixed into a mixed powder. The mixed powder is pressed into a green compact. Then, the green compact is presintered, hot forged, sintered, and, if required, further heat treated, in sequence to be formed into an Fe-base sintered alloy having a structure wherein particles of the at least one lubricating component and hard particles of other components are dispersed in a matrix formed principally of a pearlite phase. The resulting alloy possesses a density of at least 7.3 g/cm.sup.3 and Rockwell handness of 30-50 in Rockwell Scale C, and hence exhibits excellent abrasion resistance as well as excellent lubricity.
REFERENCES:
patent: 3479289 (1969-11-01), Van Wyk
patent: 3880600 (1975-04-01), Zboril
patent: 4204031 (1980-05-01), Takemura et al.
patent: 4345943 (1982-08-01), Takahashi et al.
patent: 4348232 (1982-09-01), Hiraoka et al.
patent: 4546737 (1985-10-01), Kazuoka et al.
patent: 4599110 (1986-07-01), Kohler et al.
patent: 4614544 (1986-09-01), Lall
Henderson et al., "Metallurgical Dictionary", 1953, p. 79.
Ishikawa Yoshimi
Mayama Osamu
Jorgensen Eric
Lechert Jr. Stephen J.
Mitsubishi Kinzoku Kabushiki Kaisha
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