发明授权
US07040601B2 Valve guide for internal combustion engine made from iron base sintered alloy 有权
由铁基烧结合金制成的内燃机导向阀

Valve guide for internal combustion engine made from iron base sintered alloy
摘要:
Valve guides made of ferrous sintered alloy for internal combustion engines have improved durability of the valve stem without soft nitriding process. The valve guides include Cu: 8 to 20 mass %, C: 0.8 to 1.5 mass %, and at least one of MnS, WS2, and MoS2: 0.5 to 2 mass % and the balance of Fe, the valve guides have many pores, have a metal structure in which the copper phase dispersed in an iron pearlite matrix exists, and have a structure in which metal sulfides are dispersed between particles between the matrix and the copper phase.
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