METAL COMPOSITE MATERIAL

摘要

This invention provides a metal composite material comprising a composite part and a parent material part comprising a second metal (2) for covering the composite part. The composite part comprises a sinter (1) prepared by sintering a powder of a first metal, and a second metal (2') impregnated into at least pores of a surface layer part in the sinter (1). The metal composite material is characterized in that a fitting part formed by sintering both the metal powder and a melt-out material having a melting point at or below the sintering temperature of the metal powder or a burn-out material which is burned out at a temperature at or below the sintering temperature to form a sinter (1) and thus to impregnate a second metal (2') into pores of the sinter (1) and to allow the second metal (2') to enter into a site (3) formed by melt-out of the melt-out material or burn-out of the burn-out material, is provided at the interface of the composite part and the parent material part. According to this novel construction, cracking or separation in the metal composite material can be suppressed. The melt-out material preferably contains an alloying component element which forms an alloy with a main component element of the metal powder. When the main component element is iron and the alloying component element is copper, the strength of the fitting part is improved.