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分别以硅酸铝短纤维和磷酸铝为增强体和预制体高温粘结剂,采用挤压浸渗法分别制备出体积分数为15%、20%、25%和30%的镁基复合材料。利用MM200磨损试验机,分别在外加载荷为10、20、30、40和50N及滑动速度为0.47和0.94m/s条件下,与硬度为HRC53的20Cr对磨环在干态条件下进行对磨,考察了外加载荷对不同体积分数硅酸铝短纤维增强AZ91D镁基复合材料试样磨擦率和磨损机制的影响,并通过扫描电镜对试样摩擦表面进行了形貌观察和分析。结果表明:在低滑动速度(0.47m/s)下,复合材料的磨损机制随着外加载荷的改变而改变;而在高滑动速度(0.94m/s)条件下,则没有这种改变;在干磨条件下,试样磨损率随体积分数的变化受到外加载荷和滑动速度的影响。
The magnesium matrix composites with volume fractions of 15%, 20%, 25% and 30% were prepared by squeeze infiltration method using aluminum silicate short fiber and aluminum phosphate as reinforcement and preform high temperature binder, respectively. The MM200 wear tester was used to grind the ring with 20Cr HRC53 under the condition of applied load of 10, 20, 30, 40 and 50N and sliding speed of 0.47 and 0.94m / s, respectively The effect of applied load on the friction coefficient and wear mechanism of AZ91D magnesium matrix composites with different volume fractions of aluminum silicate short fibers was investigated. The morphology of the friction surface was observed and analyzed by scanning electron microscopy. The results show that the wear mechanism of the composite changes with the applied load at low sliding velocity (0.47 m / s), but not at the high sliding velocity (0.94 m / s) Dry grinding conditions, the specimen wear rate changes with the volume fraction by the applied load and sliding speed.