碳纤维增强纸基摩擦材料是应用于汽车自动变速器中的一种新型湿式摩擦材料. 在固定原材料配比和含量的基础上, 通过改变摩擦材料厚度, 制备出几种孔隙率不同的碳纤维增强纸基摩擦材料. 采用液体渗透法测试摩擦材料的孔隙率. 利用扫描电镜观察试样形貌. 通过惯量试验机研究孔隙率对碳纤维增强纸基摩擦材料湿态摩擦磨损性能的影响. 试验结果表明: 短切碳纤维在树脂基体中均匀分散, 相互桥接, 形成了大小不一的贯穿性孔隙; 随着孔隙率的增大, 摩擦力矩曲线趋于平稳; 动摩擦系数升高, 静摩擦系数降低, 磨损率增大.
Paper-based friction material reinforced by carbon fiber is a new type wet friction material for automobile transmission. Based on the same percentage of components, paper-based friction materials reinforced by carbon fiber with different porosity percentage were prepared by changing the thickness of friction materials. The porosity percentage of materials was obtained
by a liquid permeation method. The surfaces of samples were analyzed by using scanning electronic microscope (SEM). The effects of porosity percentage on wet friction performance were investigated by using an inertia friction tester machine. Experiment results show that short carbon fiber is dispersed in resin matrix uniformly, as a result, pores with different sizes are formed inthis way. With the increase of porosity percentage, the shape of friction torque curves becomes flat, and the dynamic friction coefficient tends to increase in the procession, but the trend of static friction coefficient is reversed, the wear rate is trending up.
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