【摘要】 以短炭纤维针刺整体毡为增强体,采用化学气相渗透(CVI)法制备C/C多孔坯体,利用气压熔渗将Cu渗入到C/C多孔体中制备C/C-Cu复合材料.在QDM150型干摩擦试验机上测试了不同速度下C/C-Cu复合材料的摩擦磨损性能.采用金相显微镜和扫描电镜分别观察材料的结构和摩擦表面形貌.结果表明:在滑动速度分别为20.5m/s,28.5m/s和35m/s条件下,材料摩擦因数分别为0.32,0.49和0.37,线磨损量分别为0.05mm,0.09mm和0.85mm;低速下,材料表面未形成摩擦膜,以磨粒磨损为主,较高速度下,形成摩擦膜,以粘着磨损为主.更多还原

【Abstract】 C/C-Cu composites were prepared by chopped carbon fiber needled felts which were intensified by chemical vapor infiltration(CVI)and subsequent molten Cu infiltration technique under pressure.The friction and wear behavior of the composites was investigated at various sliding velocities on a QDM150 wear test.The microstructures and friction surfaces were observed by optical microscopy and scanning electron microscopy respectively.The results show that the friction coefficients at 20.5 m/s,28.5 m/s,35m/s were 0.32,0.49,0.37,respectively and linear wear value were 0.05 mm,0.09 mm,0.85 mm,respectively.At lower sliding velocity,no patina is formed and wear mechanism of C/C-Cu composites is mainly abrasives worn,while at higher sliding velocity,friction film is formed and their worn is mainly adhesion worn.更多还原