A powdered alloy sheet process which provides the required minimum wear-resistant layer was developed. This layer was obtained by bonding a flexible sheet formed with wear-resistant alloy powder using polymer as the binder to the sliding parts, and subsequently by heating.
By the heat stability tests made among Alkyd resin, Urethane polymer, Vinyl acetate and Acrylic resin, Acrylic resin was selected for the binder due to the superior properties without causing molding defects such as pin holes, because in the heating the resin was degenerated to the tar-pitch like material and the carbon like material, allowing superior bonding of the alloy sheet to the base steel. Especially, the sheeted powder of mixed SUS-410 and OS-23 with adding acrylic resin by 2-4 wt% was soft enough to bond to the curved parts by the sintering after the preheating. This process succeeded to apply for the cam shaft, the rocker arms and the swing arms.