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以常规和纳米团聚体Al_2O_31 3%TiO_2(质量分数)陶瓷粉末为原料,采用等离子喷涂和等离子喷涂一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。
The conventional and nanostructured ceramic coatings were prepared on the surface of TiAl alloy by using conventional and nano-scale agglomerated Al 2 O 3 31% TiO 2 ceramic powders as raw materials, plasma spraying and plasma spraying-laser remelting composite process. The effects of powder structure and The influence of preparation process on the erosion resistance of the coating was discussed and the erosion damage mechanism of various coatings was also discussed. The results show that the laser remelted coating has better erosion resistance than the plasma sprayed coating. Under the same conditions, the nanostructured coatings have better erosion resistance than conventional coatings. Conventional ceramic coatings exhibit typical brittle erosion characteristics, nanostructured ceramic coatings exhibit marked brittle erosion characteristics, with a certain degree of plastic erosion characteristics. The erosion and erosion of the plasma sprayed coatings were dominated by lamellar detachment with a certain degree of fragility of the brittle ceramic particles; while the laser remelted samples initiated and expanded near the surface cracks, eventually resulting in the remelt grain crushing, peeling the Lord.