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对质量分数分别为20%、30%和40%的高含量B4C/Al基复合材料的磨损行为进行了研究,分析了颗粒含量、载荷变化以及磨损时间对该复合材料磨损性能的影响,探索了该复合材料磨损过程的微观机制。结果表明:B4C/Al基复合材料的磨擦系数随B4C含量的增加而减小,材料耐磨损性能随B4C硬质颗粒含量的增加而提高;随载荷从30 N增加到70 N,B4C/Al复合材料的磨擦系数先减小再增加,材料磨损速率随载荷增加而增大。随磨损进行,整个磨损过程体现出阶段性的变化,复合材料的摩擦系数先减小再增加,磨损速率先缓慢增大,然后较快增长。高含量B4C/Al基复合材料磨损过程主要表现为犁削磨损和黏着磨损的磨损方式,同时还伴随有氧化磨损机制。
The wear behavior of high content B4C / Al matrix composites with mass fraction of 20%, 30% and 40% respectively was studied. The influence of particle content, load change and wear time on the wear behavior of the composites was investigated. The microscopic mechanism of the composite wear process. The results show that the friction coefficient of B4C / Al matrix composites decreases with the increase of B4C content, and the wear resistance of B4C / Al composites increases with the increase of B4C hard particles content. With the increase of load from 30 N to 70 N, The friction coefficient of the composite material decreases first and then increases, and the wear rate of the material increases with the increase of the load. With the wear, the wear process shows a gradual change, the friction coefficient of the composite material decreases first and then increases, the wear rate increases slowly, and then grows faster. The wear process of high content B4C / Al matrix composites is mainly manifested as the abrasion mode of plow abrasion and adhesive wear, accompanied by oxidative wear mechanism.