【作者】 王华明； 于荣莉； 李锁歧；

【Author】 WANG Hua-ming, YU Rong-li,Li Suo-qi, (Laboratory of Laser Materials Processing and Surface Engineering, School of Materials, Beijing University of Aeronautics and Astronautics, Beijing 100083, China; State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China)

【机构】 北京航空航天大学材料学院激光材料加工及表面工程实验室；

【摘要】 以Al2O3-NiO陶瓷粉末为原料,利用激光熔敷技术,在Al2O3陶瓷基材上制得由初生Al2O3树枝晶和枝晶间NiO薄膜状固体润滑剂组成的NiO／Al2O3陶瓷基自润滑耐磨复合涂层。与激光熔敷100％Al2O3陶瓷涂层相比, 激光熔敷NiO／Al2O3陶瓷基自润滑耐磨复合涂层虽然硬度大幅度降低,但在常温滑动干摩擦条件下的耐磨性大幅度提高、摩擦系数显著降低,自润滑相NiO体积分数约为40％时涂层的磨损失重和摩擦系数最低。更多还原

【Abstract】 NiO/Al2O3 self-lubricating wear resistant ceramic matrix composite coatings with a microstructure consisting of Al2O3 primary dendrites and the inter-dendritic film-like NiO solid lubricant phase were fabricated on Al2O3 ceramic substrate by laser cladding with Al2O3-NiO ceramic powder blends. Compared with the laser clad monolithic Al2O3 ceramic coatings, laser clad NiO/Al2O3 self-lubricating composite coatings have excellent wear resistance and low friction coefficient under room-temperature dry sliding, although the hardness of the latter is much lower than that of the former. The optimum content of NiO self-lubricant in the composite coatings in terms of friction coefficient and wear weight loss is approximately 40wt.%.更多还原