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研究了 4 5 #钢表面激光熔覆纳米Al2 O3 复合陶瓷涂层的微观组织结构、显微硬度和磨损特性。结果表明 ,激光熔覆层由α-Al2 O3 和TiO2 以及Al2 O3 纳米颗粒组成 ,在激光的作用下 ,消除了原来等离子喷涂层的片层状组织 ;纳米颗粒仍然保持纳米尺度 ,填充在涂层的大颗粒之间 ,起着桥连的作用 ;同时涂层气孔率的降低使涂层致密化程度得以提高 ,纳米Al2 O3涂层的显微硬度较高 ,且其耐磨性能明显优于等离子Al2 O3 +1 3%TiO2 喷涂层
The microstructure, microhardness and wear properties of laser cladding nano Al 2 O 3 composite ceramic coating on 45 steel were studied. The results show that the laser cladding layer consists of α-Al 2 O 3 and TiO 2, and Al 2 O 3 nanoparticles. The lamellar structure of the plasma sprayed layer is eliminated by the action of the laser. The nano-particles remain on the nano-scale and are filled in the coating Of the large particles play a role in bridging; at the same time reduce the porosity of the coating so that the degree of densification of the coating can be improved, nano Al2 O3 coating higher microhardness, and its wear resistance was significantly better than the plasma Al 2 O 3 +1 3% TiO 2 spray coating