| 摘要 |
PURPOSE:To form a coating layer where fine metallic oxide particles are uniformly dispersed on the surface of a metallic matrix and to drastically improve the corrosion resistance and oxidation resistance of the thermal spraying coated metallic member. CONSTITUTION:The surface of a heat resistant alloy matrix of an Ni base, Co base or the like is coated with mechanically allayed powder in which coarse particles having >=100mum particle size and fine particles of <=50mum are mixed by thermal spraying. As the metallic oxide, Al2O3 or rare earth metallic oxide is used, and >=50vol.% of the whole body is formed of fine particles having <=1mum particle size. Moreover, the ratio of the fine particles in the mechanically alloyed powder is preferably regulated to 0.2 to 1.0 times by weight to the coarse particles. Furthermore, after the thermal spraying, it is subjected to heat treatment at <=1200 deg.C in a vacuum or the like to improve its corrosion resistance and oxidation resistance. |
