硅灰含量对碳毡/水泥复合材料摩擦学性能的影响

摘要

以水泥为黏结剂,碳(纤维)毡为增强材料,硅灰为摩擦性能调节剂,采用浸渍法制备了不同硅灰含量碳毡/水泥复合材料,研究了硅灰含量对复合材料摩擦学性能的影响,分析了摩擦磨损机理.结果表明:随着硅灰含量的增加,复合材料的密度先增大后减小,摩擦因数和磨损率则先减小后增大;在摩擦过程中,摩擦表面温度随时间的延长均呈先升高后平稳的变化趋势,稳定后的温度随硅灰含量的增加先减小后增大;当硅灰质量分数为20%时,复合材料摩擦学性能最好,密度最大(1.53 g·cm-3),摩擦因数和磨损率最小,分别为0.55和5.32×10-6 g·N-1·m-1,对应磨损表面上的磨痕短且浅,且存在由磨屑形成的均匀连续润滑薄膜.%Carbon felt/cement composites with different silica fume content were prepared by impregnation method using cement as binder, carbon (fiber) felt as reinforcing material and silica fume as friction modifier.The effects of silica fume content on the tribological properties of the composites were investigated and the mechanism of friction and wear was analyzed.The results show that with the increase of the silica fume content, the density of the composites first increased then decreased, while friction coefficient and wear rate first decreased then increased.During the friction process, the friction surface temperature showed a trend of first increasing then stabilizing with the extension of time.And the stabilized temperature first decreased then increased with the silica fume content increasing.When the mass fraction of silica fume was 20%, the tribological properties of the composite were relatively good.The density reached the largest value of 1.53 g·cm-3, while the friction coefficient and wear rate achieved the smallest values of 0.55 and 5.32 ×10-6 g·N-1·m-1, respectively.The corresponding wear surface had some short and shallow wear marks, and also the uniform and continuous lubricating film formed by abrasive dust was observed.