| 摘要 |
PROBLEM TO BE SOLVED: To obtain a wear resistant coating layer free from segregation and good in adhesion without requiring working for thinning by subjecting a white metal layer with specified thickness and porosity coated on the bearing face of a bearing base material by a thermal spraying method to diffusion adhesion heating treatment at the temperature equal to or below the m.p. thereof. SOLUTION: The bearing face of a bearing base material 1 is roughened to 5 to 50μm Ra or 30 to 500μm Rmax, preferably by blasting treatment and is thereafter thermal-sprayed with white metal powder of 10 to 200μm grain size at a high speed of 350 to 1500 m/sec by a high speed flame spraying or the like. In this way, the bearing face is densely coated with a white metal layer 2 to 1 to 30 mm thickness and <=20% porosity. Next, this coated bearing base material 1 is heated to hold it at the temperature equal to or below the m.p. of the white metal, e.g. at 100 to 250 deg.C for 30 min to 50 hr in a heating furnace and is subjected to diffusion adhesion treatment. In this way, the coating layer 2 is hardened to 18 to 35 Brinell hardness and is formed to <=10% porosity as well, and, moreover, a diffusion layer is formed on the boundary with the bearing base material 1 to the thickness of 2 to 200μm.
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