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研究了钛合金表面等离子喷涂纳米结构的Al_2O_3+13wt.%TiO_2复合陶瓷涂层激光重熔的微观结构形貌、物相、显微硬度及结合强度。结果表明涂层在激光重熔后,消除了等离子喷涂后的片层结构组织,在涂层中仍存在部分未熔的纳米结构颗粒,分散了涂层内的应力。原等离子喷涂层中的γ-Al_2O_3亚稳态相消失,全部转变为稳态相α-Al_2O_3,TiO_2则由板钛矿相完全转变为热力学稳定的金红石相,重熔后的喷涂层致密性、显微硬度和结合强度均得到了明显提高。
The microstructure, phase, microhardness and bonding strength of laser remelted Al 2 O 3 + 13wt.% TiO 2 composite coating on the surface of titanium alloy plasma sprayed nanostructured were studied. The results show that after the laser remelting, the structure of the lamellar structure after plasma spraying is eliminated, and some unmelted nanostructured particles still exist in the coating, which disperses the stress in the coating. The metastable phases of γ-Al 2 O 3 in the original plasma sprayed coatings disappeared and all of them changed to α-Al 2 O 3 in the steady state. TiO 2 completely transformed from the brookite phase to the thermodynamically stable rutile phase. The dense, Microhardness and bonding strength have been significantly improved.