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中文摘要：
以常规和纳米团聚体Al2O3-13%TiO2（质量分数）陶瓷粉末为原料,采用等离子喷涂和等离子喷涂-激光重熔复合工艺在TiAl合金表面制备了常规和纳米结构陶瓷涂层,分析了粉末结构及制备工艺对涂层抗冲蚀性能的影响,并探讨了各种涂层的冲蚀破坏机理.结果表明：相对于等离子喷涂试样,激光重熔涂层有较好的抗冲蚀性能.在同等条件下,纳米结构涂层的抗冲蚀性能优于常规涂层.常规陶瓷涂层表现为典型的脆性冲蚀特性,纳米结构陶瓷涂层呈明显的脆性冲蚀特性,同时有一定程度的塑性冲蚀特征.等离子喷涂层的冲蚀磨损以片层状脱落为主,同时有一定程度的脆性陶瓷颗粒破碎;而激光重熔试样以近表面的裂纹萌生和扩展,最终导致重熔层晶粒破碎、剥离为主.
英文摘要：
The conventional and nanostructured Al2O3-13%TiO2 （mass fraction） ceramic coating were fabricated by plasma spraying and plasma spraying-laser remelting technologies with conventional and nanostructured agglomerated powders on TiAl alloy surface. The influences of materials structure and preparation process on erosion resistance of the coatings were studied. Meanwhile, the erosion failure mechanisms of the coatings were discussed. The results show that the laser-remelted coating has better erosion resistance than the plasma-sprayed coating. And the nanostructured coating has better erosion resistance than the conventional coating. It is found that the conventional coating shows a brittleness erosion mechanism. The nanostructured coating exhibits a mainly brittleness erosion feature, as well as some plasticity erosion characteristic. Owing to the limited bonding at the interfaces between lamellar, the spalling of ceramic particles from the lamellar interface may be mainly responsible for the erosion of the both as-sprayed conventional and nanostructured coating. In contrast, cracking occurs within region near the surface of the laser-remelted ceramic coating and that erosion occurs by removal of these small blocks.
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