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汽车轻量化是当今汽车工业发展的主旋律.针对制动盘的轻量化,研究了SiC颗粒增强铝基复合材料与摩擦材料干滑动的摩擦行为,并探讨了其增摩的机理.结果表明:随SiC质量百分数从50%增加到55%,最大静摩擦系数增大了约80%.两对摩擦副的静摩擦系数随压力增大均明显增大,随滑动速度提高则呈先增后减的趋势.干滑动摩擦导致的摩擦表面温度升高造成基体软化,增强相脱落,且使得磨损机理由磨粒磨损向黏着磨损转变,从而严重影响摩擦系数的稳定性.
The light weight of the automobile is the main theme of the development of the automobile industry today.Aiming at the weight reduction of the brake disc, the frictional behavior of the SiC particle reinforced aluminum matrix composites with the frictional material is studied, and the mechanism of its friction increasing is discussed. The mass fraction of SiC increased from 50% to 55%, and the maximum static friction coefficient increased about 80%. The static friction coefficient of two pairs of friction pairs increased obviously with increasing pressure, and then increased with the increase of sliding velocity. Dry sliding friction caused by the friction surface temperature causes the matrix to soften and enhance the phase loss, and make the wear mechanism from abrasive wear to adhesive wear change, thus seriously affecting the stability of the friction coefficient.