| 摘要 |
PURPOSE:To easily obtain a thermally sprayed film combining heat resistance with wear resistance at a low cost, by providing a porous thermally sprayed film of low volume density to the surface of a metallic base material and by forming a dense thermally sprayed film by using a high-energy thermal spraying method on the above- mentioned film. CONSTITUTION:The surface of a metallic base material 1 is subjected to shot blasting treatment, on which a porous thermally sprayed film 2 of <=90% volume density is formed by a plasma thermal spraying method. Subsequently, a dense thermally sprayed film 3 consisting of ceramics or low-toughness metallic material is formed on the above-mentioned thermally sprayed film 2. This dense thermally sprayed film 3 is formed by a high-energy thermal spraying method consisting of a high energy gas thermal spraying method using gas combustion or explosion energy or a plasma thermal spraying method. Further, a thermally sprayed film of metal or cermet may be previously provided to the above-mentioned base material, if necessary. By this method, heat-resisting characteristics, particularly thermal shock resistance, can be improved without causing deterioration in the wear resistance of the thermally sprayed film 3, and a thermally sprayed film 6 combining heat resistance with wear resistance can be obtained.
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