Microstructure and Wear Behaviour of Laser-induced Thermite Reaction Al_2O_3 Ceramic Coating on AA7075 Aluminum Alloy

作     者：Kaijin HUANG Xin LIN Changsheng XIE T.M. Yue 

作者机构：State Key Laboratory of Plastic Forming Simulation and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi＇an 710072 China Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Hom Hong Kong China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2007年第23卷第2期

页      面：201-206页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The Open Fund of the State Key Laboratory of Plastic Forming Simulation and Mould Technology in Huazhong University of Science and Technology the Open Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnic University 

主　　题：Laser cladding Thermite reaction Aluminum alloy Wear 

摘      要：The microstructure and wear behaviour of the thermite reaction coating produced by the hybrid laser claddingremelting on AA7075 aluminum alloy for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, Al-Fe2O3-SiO2, and Al-TiO2-SiO2 were studied. The results of the X-ray diffraction （XRD） analysis show that in all the four reaction coatings, α-Al2O3 and γ-Al2O3 phases were present at the top surface, together with various intermetallic phases, the corresponding reduced metal and Al phase in the fusion zone. Under the dry sliding condition, the wear resistance, in terms of weight loss, of the laser-clad specimens was considerably higher than that of the untreated specimen. The predominant wear mechanism of the former specimens was abrasive wear, while for the latter, it was the adhesive wear that prevailed.