Sintered valve guide and production method therefor
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United States of America Patent
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Dec 15, 2015
Grant Date -
Jun 23, 2011
app pub date -
Dec 14, 2010
filing date -
Dec 21, 2009
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Abstract
A sintered valve guide exhibits a metallic structure having a mixed structure and a hard phase in which hard particles are dispersed in an alloy matrix. The mixed structure consists of pearlite, an Fe—P—C ternary eutectic phase, a ferrite phase, a copper phase, and pores, and the mixed structure consists of, by mass %, 0.075 to 0.525% of P, 3.0 to 10.0% of Cu, 1.0 to 3.0% of C, and the balance of Fe and inevitable impurities. The hard phase is dispersed at 2 to 15 mass % in the mixed structure.
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