C/C-SiC复合材料的水润滑摩擦磨损特性

Friction and Wear Behaviors of C/C-SiC under Water Lubrication

通过液相气化热梯度CVI法与反应熔渗法（RMI法）相结合,制备出C/C-SiC复合材料;材料密度1.4-1.6 g/cm^3。通过环块摩擦磨损实验考察了在水润滑条件下的载荷和摩擦速度对其摩擦磨损特性的影响。实验结果表明：在水润滑环块式摩擦试验中,摩擦速度对C/C-SiC试样的摩擦系数和比磨损率影响较大：①当摩擦速度小于1.046 m/s时,摩擦系数稳定在0.12左右;②当摩擦速度高于1.046 m/s,摩擦系数减小很快,尤其是当摩擦速度达到2.092 m/s后,摩擦系数减小到0.01-0.02,这与水润滑膜的形成有关;③随着摩擦速度的增加,摩擦系数和比磨损率都有较大减小。载荷的影响相对较小：随着载荷的增加,摩擦系数和比磨损率都有所增大。C/C-SiC试样的摩擦磨损过程以磨粒磨损和微凸体断裂机理为主。

C/C-SiC composites,prepared by a modified thermal gradient chemical vapor infiltration（preparing C/C） combined with reactive melt infiltration（infiltrating Si）,were studied for the friction and wear behaviors in this paper.The results show that during block-on-ring tests under water lubrication,the friction coefficient and specific wear rate of C/C-SiC samples increase with the increasing of load,but decrease with the increasing of sliding velocity,and the sliding velocity is with greater effect on the friction and wear behaviors than the load does.The C/C-SiC samples mainly subject to the grain wear and fracture wear in the process of friction.