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为提高镁合金表面硬度和耐磨性,采用激光熔覆技术在镁合金表面制备Al-Si共晶合金涂层,系统分析了涂层的硬度和耐磨性变化特征。研究结果表明,涂层主要相组成为Mg2Si、Mg17Al12和Mg2Al3,显微组织为方向紊乱的树枝晶。涂层硬度高达350~450HK,较原始镁合金的硬度(80 HK)提高340%~462%。涂层的摩擦系数与原始镁合金相同,均为0.3左右。由磨痕宽度换算成磨损体积得到涂层磨损体积为4×10-3 mm3,而原始镁合金磨损体积为67×10-3 mm3,与原始镁合金相比,涂层的耐磨性提高74%~92%。
In order to improve the surface hardness and wear resistance of the magnesium alloy, the Al-Si eutectic alloy coating was prepared on the surface of the magnesium alloy by laser cladding, and the change characteristics of hardness and wear resistance of the coating were systematically analyzed. The results show that the main coating phase composition of Mg2Si, Mg17Al12 and Mg2Al3, the microstructure of dendrites dendritic orientation. Coating hardness up to 350 ~ 450HK, compared with the hardness of the original magnesium alloy (80 HK) increased 340% to 462%. The coefficient of friction of the coating is the same as that of the original magnesium alloy, all about 0.3. The abrasion volume of the coating is 4 × 10-3 mm3, which is converted from the wear scar to the wear volume, while the wear volume of the original magnesium alloy is 67 × 10-3 mm3. Compared with the original magnesium alloy, the wear resistance of the coating increases by 74 % ~ 92%.