铝合金基体电热爆炸喷涂钼涂层的制备工艺与性能

采用电热爆炸喷涂技术在铝合金基体上制备钼涂层,用SEM、划痕仪、显微硬度计、表面粗糙度仪、微磨损试验机等表征了涂层性能。借助正交试验方法分析了钼涂层制备中各工艺参数对涂层质量的影响,确定了最佳工艺参数。结果表明:用电热爆炸喷涂方法制备的钼涂层均匀致密,孔隙率低;涂层与基体形成冶金结合,结合强度高;涂层硬度为基体的4.9倍,体积磨损量仅为基体的11.2%,耐磨性大幅增加。电爆炸喷涂的工艺参数中,对涂层质量和结合力影响最大的是喷涂距离,其次是喷涂次数,影响最小的是喷涂电压。

Process and properties of molybdenum coatings prepared by electro-thermal explosion spraying on aluminum alloy surface

Molybdenum coatings were prepared on aluminum alloy by electro-thermal explosion spray.Properties of the molybdenum coatings were studied by SEM,scratch tester,microhardness and surface roughness tests,and micro-wear test machine.The effects of process parameters on the coating qualities are analysed and the process parameters are optimized based on orthogonal experiments.The results show that the molybdenum coatings are uniform,continuous,compact and low porosity.Metallurgical bond is formed between the coatings and the substrate.Microhardness of the molybdenum coatings is 4.9 times as that of the substrate,while the wear volume loss is only 11.2%,compare with that of the substrate,indicating the improvement of the aluminum alloy surface wear resistance.Among the process parameters,which affect the coating quality and binding strength,the distance of spray is critical,then is the times of spraying,the mild effect is observed for the spray voltage.