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用模拟刹车制动的方法探讨了一种炭纤维布叠层炭 /炭复合材料在不同制动速度下的摩擦磨损行为 ,并用扫描电子显微镜对摩擦表面进行了观察和分析。研究结果表明 :在 5m/s的制动速度下 ,该种材料表现出低的摩擦因数 ,但随制动速度升高至 2 0m/s时 ,摩擦因数迅速升高至最大值 0 .4 0 ;当制动速度增大到 2 8m/s或 30m/s时 ,摩擦因数仅略降低至 0 .35 ,该材料表现出优良的高速高能摩擦性能。另一方面 ,制动速度升高至 2 0m/s时 ,即摩擦因数最大时 ,磨损才变得明显 ,而且随制动速度的继续升高 ,磨损呈直线增大。表面显微组织观察表明 ,在较低制动速度下 ,在摩擦表面产生了薄膜 ,对应摩擦因数较低 ,磨损小 ;在 2 0～ 2 5m/s制动速度下 ,摩擦表面形成较厚的表面膜层 ,对应摩擦因数高 ,磨损大 ;在 2 8～ 30m/s制动速度下 ,剧烈的摩擦剪切和氧化作用使摩擦表面严重破坏 ,表面基质炭氧化严重 ,纤维则被拉断或拔出
The friction and wear behavior of a carbon fiber cloth laminated carbon / carbon composite under different braking speeds was investigated by simulating brake braking. The friction surface was observed and analyzed by scanning electron microscopy. The results show that the material exhibits a low coefficient of friction at a braking speed of 5 m / s, but increases rapidly to a maximum of 0.40 with a braking speed of 20 m / s ; When the braking speed is increased to 28m / s or 30m / s, the friction coefficient is only slightly reduced to 0.35, the material exhibits excellent high-speed high-energy friction performance. On the other hand, when the braking speed is increased to 20m / s, that is, the friction factor becomes obvious when the friction coefficient is maximum, and the wear increases linearly as the braking speed continues to increase. The observation of the surface microstructure showed that the film produced on the friction surface at lower braking speed with lower friction coefficient and less wear. At the braking speed of 20 ~ 25m / s, the friction surface formed a thicker At the braking speed of 2 8 ~ 30m / s, severe frictional shearing and oxidation severely damage the friction surface, and the surface matrix carbon oxidizes seriously. The fiber is pulled off or Pull out