Fabrication and characterization of Al_2O_3-metal composite coating on steel plate with nonpressure combustion synthesis  

作　　者：Chang-Hao Wang Ze-Hua Wang Ze-Hua Zhou Shao-Qun Jiang Xiao-Feng Xue Jing-Jing Yao 

机构地区：[1]College of Mechanics and Materials, Hohai University [2]School of Materials Science and Engineering, Shanghai University

出　　处：《Rare Metals》2013年第4期390-396,共7页稀有金属（英文版）

基　　金：financially supported by the Ministry of Education of China(No.625010312)

摘　　要：Al2O3-metal composite coatings with different reactants and diluents were fabricated on mild steel plate with nonpressure combustion synthesis process. The coat-ings were characterized by means of X-ray diffraction, scanning electron microscopy, and energy-dispersive spec-trometry, respectively. Thermal shock tests were carried out to determine the bond strength of the coating with the steel substrate. The results indicate that the coating is composed of α-A1203, α-（Fe-Cr） and Al2SiO5 as the main phases. It is found that the coating with the diluents of Al2O3-SiO2 and transition layer of Al2O3-Cr presents the hi.ghest hardness of 2270 HV0.2 and the lowest porosity of 3.93 %. Owing to a metallurgical bond of the coating-to-substrate, the coating exhibits a good thermal shock resistance.Al2O3-metal composite coatings with different reactants and diluents were fabricated on mild steel plate with nonpressure combustion synthesis process. The coat-ings were characterized by means of X-ray diffraction, scanning electron microscopy, and energy-dispersive spec-trometry, respectively. Thermal shock tests were carried out to determine the bond strength of the coating with the steel substrate. The results indicate that the coating is composed of α-A1203, α-（Fe-Cr） and Al2SiO5 as the main phases. It is found that the coating with the diluents of Al2O3-SiO2 and transition layer of Al2O3-Cr presents the hi.ghest hardness of 2270 HV0.2 and the lowest porosity of 3.93 %. Owing to a metallurgical bond of the coating-to-substrate, the coating exhibits a good thermal shock resistance.

关 键 词：Combustion synthesis Al2O3-metalcomposite coating DILUENTS Thermal shock resistance 

分 类 号：TG174.44[金属学及工艺—金属表面处理]