| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composite material (fiber-reinforced ceramic) part structure having excellent erosion resistance and excellent smoothness on the surface to be exposed to high temperature gases, wholly having a proper strength, and capable of being produced at a proper cost by reducing the thickness of each fiber bundle and narrowing the mutual distance of fiber bundles in the surface layers in comparison with those of the lower layer. SOLUTION: This composite material part to be exposed to high temperature gases is formed from a fiber-reinforced ceramic. In the surface layer 1 of the composite material (fiber-reinforced ceramic) part structure, the thickness of each fiber bundle 3 is reduced, and the mutual distance of fiber bundles 3 is narrowed in comparison with those of the lower layer 2. Thereby, the fiber bundles in the matrix 4 of the surface layer 1 are finely distributed, and the dense surface having improved erosion resistance and improved surface smoothness is obtained. The lower layer 2 is controlled to a proper fiber bundle thickness and a proper fiber bundle distance in the consideration of strength and cost. The thickness of the surface layer 1 is desirably 0.2-5 mm. The fiber-reinforced ceramic includes a SiC fiber/SiC matrix, C fiber/SiC matrix, and Al2O3 fiber/Al2O3 matrix. |
