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采用SHS(自蔓延高温合成)反应火焰喷涂工艺,将Al-CuO铝热反应体系引入到喷涂陶瓷材料中,在纯铜表面制备Al2O3基复合陶瓷涂层.结果表明,SHS反应热喷涂层与基体的结合好于常规热喷涂,辅以Ni-Al合金打底,复合涂层500度下热震循环40次时仍完好无损.复合涂层的XRD图谱表明,在层间及涂层内部生成的NiCu及AlxCuy化合物有助于增强涂层的性能,同时Al的适当过量可以起到弥补喷涂过程中Al的损失并为体系提供良好的液相环境的作用,提高反应转化率,降低孔隙率,同时复合涂层具有较好的耐磨性及抗氧化性.
The SHS reaction flame spraying process was used to introduce the Al-CuO thermite reaction system into the sprayed ceramic material to prepare the Al2O3-based composite ceramic coating on the pure copper surface.The results show that the thermal spray coating of SHS Is better than that of the conventional thermal spraying, supplemented by Ni-Al alloy primer, the composite coating is still intact under thermal shock cycle of 500 times at 40 degrees C. The XRD patterns of the composite coating show that the interfacial and coating interior NiCu and AlxCuy compounds can help enhance the performance of the coating. At the same time, the proper Al content can compensate for the loss of Al in the coating process and provide a good liquid environment for the system, improve the reaction conversion rate and reduce the porosity, meanwhile, Composite coating has good wear resistance and oxidation resistance.