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利用SEM，TEM，EDAX，声发射及磨损试验等方法研究了激光熔覆Al2O3-NiCrAl复合陶瓷层的组织结构、脆性及其干滑动摩擦磨损特性。结果表明：Al2O3激光馆覆层由α-Al2O3往状晶及往晶间少量的Ni2Al18O29相组成，熔覆层硬度达2351～2667Hv0.2，熔覆层的脆性与等离子喷涂层相比有所增大；其耐磨性能为等离子喷涂层的2倍左右，在滑动摩擦条件下熔覆展的磨损机制是脆性剥落和磨料磨损。
The microstructure, brittleness and dry sliding friction and wear properties of laser clad Al2O3-NiCrAl composite ceramic coatings were studied by means of SEM, TEM, EDAX, acoustic emission and abrasion tests. The results show that the cladding of Al2O3 laser cladding consists of α-Al2O3 dendrite and a small amount of interfacial Ni2Al18O29 phase. The hardness of cladding layer reaches 2351-2667Hv0.2. The brittleness of cladding layer increases compared with that of plasma sprayed layer Its abrasion resistance is about 2 times that of the plasma sprayed coating, and the wear mechanism of the cladding during the sliding friction is brittle spalling and abrasion.