C/C复合材料特性对其摩擦磨损性能的影响

在MM-2000环-块摩擦试验机上研究了制备工艺、石墨化度、密度、纤维取向等材料特性对其摩擦磨损性能的影响。研究结果表明，采用化学气相渗透(CVI) 浸渍工艺制备并经过多次浸渍增密且石墨化后的材料具有优良的摩擦磨损特性。石墨化后试样的密度越大，其摩擦磨损性能也越好。一般情况下在载荷适中时，垂直试样的摩擦系数要大于平行试样，而体积磨损量却小于平行试样。C／C复合材料比高强石墨材料更适宜用作航空发动机轴间密封材料。

The effect of C/C composites characteristic on sliding friction and wear behavior

The sliding friction and wear behaviors of C/C composites to be used in the seal ring of the main axis of turbine engines for airplane were tested on a MM-2000 ring-block frictional tester. The effect of preparation conditions, graphitization treatment in the final step, density, and carbon fiber direction in the composites on the behavior was investigated. It is found that after CVI, resin impregnation, densification and graphitization, the C/C composites have good tribology properties. When the composites are graphitized in the final step, their densities are higher and tribology properties are better than those of un-graphitized samples. When the load is moderate, the friction coefficient of perpendicular samples is higher than that for parallel ones, but the volume loss of perpendicular samples is lower than that for parallel ones. The C/C composite rings are superior to those made of high strength graphite for this application.