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采用自制的机械-超声混合搅拌设备制备出Mg2B2O5/6061Al铝基复合材料,复合材料的体积分数为2%。研究了载荷和滑动速度对基体以及复合材料的摩擦磨损性能的影响。实验结果表明,基体和复合材料摩擦系数总体上随着载荷和滑动速度的增加而减小。基体和复合材料的磨损率随载荷和滑动速度的增加而明显的增大,且基体和复合材料均存在一个临界载荷和临界滑动速度。当载荷和滑动速度到达临界值后,磨损率均急剧增大,此时试样摩擦磨损机制由微观疲劳磨损和磨粒磨损向粘着磨损与剥离磨损转变。
Mg2B2O5 / 6061Al aluminum matrix composites were prepared by self-made mechanical-ultrasonic mixing equipment. The volume fraction of the composites was 2%. The effects of load and sliding velocity on the friction and wear properties of the matrix and the composite were investigated. The experimental results show that the friction coefficient of matrix and composite decreases with the increase of load and sliding speed. The wear rate of matrix and composite increases obviously with the increase of load and sliding velocity, and both the matrix and composite have a critical load and critical slip velocity. When the load and the sliding speed reach the critical value, the wear rate increases sharply. At this time, the friction and wear mechanism of the sample changes from microscopic fatigue wear and abrasive wear to adhesive wear and peel wear.