Production method for sintered valve guide
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United States of America Patent
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Issued Date -
Apr 1, 2010
app pub date -
Sep 9, 2009
filing date -
Sep 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A production method for a sintered valve guide includes preparing a raw powder which is primarily made of an iron powder and which includes at least a copper alloy powder and a graphite powder. The production method further includes compacting the raw powder into a green compact having an approximately cylindrical shape and sintering the green compact at 950 to 1050° C. The iron powder includes particles, which do not pass through a sieve of 240 mesh, at not less than 40 mass %, and not less than 70 mass % of the powder particles have not more than 0.5 of degree of circularity.
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