镁合金表面冷喷涂316L/WC涂层的制备及摩擦学性能研究

Cold spraying processes and tribological properties of 316L/WC coating on magnesium alloy

采用冷喷涂工艺在AZ80镁合金表面制备316L和316L/WC-12Co两种涂层,利用SEM分析原始粉末形貌及涂层的显微组织,研究不同冷喷涂气体温度和压力对涂层沉积效率和孔隙率的影响,以及涂层的摩擦磨损性能和磨损机理。结果表明:采用冷喷涂工艺可在AZ80镁合金基体上制备出316L和316L/WC-12Co涂层;冷喷涂气体压力和温度对粉末沉积效率、涂层孔隙率有较大影响,气体压力和温度越高,粉末沉积效率越高,涂层孔隙率越低;冷喷涂316L和316L/WC-12Co涂层都可显著提高镁合金的耐磨性能,由于WC-12Co的加入,冷喷涂316L/WC-12Co涂层表现出更为优异的耐磨性能。

316 L and 316L/WC-12 Co coatings were deposited on AZ80 magnesium alloy substrate by cold spraying(CS). The original powder morphology and the coating microstructure were analyzed by using SEM. The effects of gas temperature and pressure on deposition efficiency and the porosity of the coatings were studied,and friction wear properties and wear mechanism of the coatings were also analyzed. The results show that 316 L and 316L/WC- 12 Co coatings can be prepared on AZ80 magnesium alloy substrate by cold spraying technology. Cold spraying gas pressure and temperature have great influence on the deposition efficiency of powder and the porosity of the coating. The higher the gas pressure and temperature,the higher the deposition efficiency,and the lower the porosity of the coating. Cold sprayed coating of 316 L and 316L/WC- 12 Co can significantly improve the wear resistance of magnesium alloy,and the 316L/WC- 12 Co coating shows more excellent wear resistance due to the addition of WC-12 Co.