| 摘要 |
PURPOSE:To provide the highest wear resistance by forming a structure contg. an Fe-Mo intermetallic compound phase dispersed as a hard phase in the matrix of a sintered iron alloy with a specified porosity as a base material. CONSTITUTION:When fine iron powder of <=30mum grain size is blended with prescribed amounts of copper powder, P alloy powder, carbon powder and Fe- Mo alloy powder, the iron powder is granulated and used as granulated powder of 30-200mum apparent grain size. The iron powder may be mixed with other powder and granulated. The powdery blend is molded into a green compact of 75-85% green compacting density, and the compact is sintered at 1,030-1,130 deg.C in a reducing atmosphere to manufacture a sintered iron alloy for members of the valve mechanism of an internal-combustion engine. Thus, the sintered alloy for the member of control valve mechanism of internal-combustion engine is obtained, which has a structure contg. an Fe-Mo intermetallic compound phase dispersed in the iron matrix of the alloy with 5-15% porosity, and the dispersed phase is harder than the matrix.
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