【摘要】 采用MM-1000型摩擦磨损试验机对以光滑层、粗糙层为基体炭的2种C/C复合材料在不同刹车压力下的摩擦磨损性能进行了测试。借助微区拉曼光谱和扫描电镜对其摩擦表面的石墨化度与形貌进行了分析。结果表明:以粗糙层为基体炭的C/C复合材料比以光滑层为基体炭的C/C复合材料有更优异的摩擦压力或温度特性。微区拉曼光谱检测证实在摩擦面上粗糙层基体炭相对光滑层基体炭更易变形,所以以粗糙层为基体炭的C/C复合材料的摩擦面在刹车压力达到0.59 MPa时便能形成较厚的摩擦膜,故其摩擦因数能在较高刹车压力下(1.05~1.82 MPa)保持较高的稳定值(0.31),且磨损适当;而光滑层基体炭C/C复合材料需在刹车压力超过0.82 MPa时摩擦面才能形成较薄的摩擦膜,并且由于其导热系数低,高压刹车时摩擦表面氧化严重,所以高压刹车时其摩擦因数衰减大,线性磨损率大,尤其是质量损失急剧升高。更多还原

【Abstract】 Friction and wear properties of carbon/carbon(C/C) composites with a smooth laminar(SL) pyrolytic carbon texture and a rough laminar(RL) pyrolytic carbon texture at different braking pressures were investigated with a home-made laboratory scale dynamometer.The degree of graphitization and morphologies of worn surfaces were investigated with micro-Raman spectroscopy and Scanning Electron Microscopy(SEM).The results show that C/C composites with a RL carbon texture have better friction-pressure or temperature properties.As RL carbon is more deformable,which confirmed by Raman spectra,a rather thick friction film can form in worn surfaces of C/C composites with RL carbon at braking pressure of 0.59 MPa and above,resulting in the constant friction coefficient and moderate wear rates at higher braking pressure(1.05～1.82 MPa).While only a thin friction film forms on worn surfaces of that with a SL carbon at braking pressure of 0.82 MPa and above.Furthermore,much matrix carbon suffers oxidation in worn surfaces at higher braking pressures,causing the decline in friction coefficient and the increase in linear wear rates,especially the steep augment in mass loss.更多还原