Fe-based sintered alloy for valve seats for use in internal combustion engines
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United States of America Patent
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Jun 6, 1989
Grant Date -
N/A
app pub date -
Oct 2, 1987
filing date -
Mar 12, 1987
priority date (Note) -
Expired
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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.
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