Wear resistance of multi-layer interlocked fabric reinforced COPNA resin composite

Two kinds of multi-layer interlocked fabric with different fabric structures were made of pitch-based carbon fiber, and the fabric was combined with condensed polynuclear aromatic (COPNA) resin to prepare multi-layer interlocked fabric reinforced COPNA resin composites. In addition, a third type of material was prepared by adding graphite to the composite material. The wear resistance of these composite materials was evaluated under both high and low loading conditions by means of the cylinder/flat plate friction tester. The following results were obtained. In case of the composite material including graphite, at low loads the friction coefficient was low, and the wear resistance was high. However, at high loads the strength of the material was reduced due to the presence of graphite, and the sample failed. In case of composite materials made without graphite, the influence of the loading condition was small, and stable, high wear resistance was observed under conditions at both high and low loads. A higher wear resistance was observed in the case where the fibers were homogeneously distributed on the sliding surface of the composite material than in case where they were heterogeneously distributed.