In order to improve the tribological properties of Al-Si alloy,the optimum preparation process of supersonic plasma spraying Al-35Si-4Fe coating was obtained adopting three factor and three level orthogonal experimental method by using YL113 Al-Si alloy as the substrate,with spraying power,total gas flow rate,and spraying distance as experimental factors,microhardness and porosity as assessment indicators.The tribological properties of the coating under this process were studied.The results show that the coating quality is best when the spraying power is 65 kW,the total air flow rate is 110 L/min,and the spraying distance is 95 mm,the microhardness of the Al-35Si-4Fe coating reaches(465±24.4)HV0.2,and the porosity of the coating is 1.3％.Under experimental conditions,the wear mechanism of Al-35Si-4Fe coating is mainly fatigue wear,supplemented by abrasive wear.The wear rate of Al-35Si-4Fe coating is 1.88×10-4 mm3/(N·m),and the friction coefficient is 0.37.The optimized Al-35Si-4Fe coating can effectively protect the internal YL113 Al-Si alloy,extend its service life,and cope with more complex working conditions.
维普
万方数据