繊維強化ポリイミド複合材料を用いたトライボマテリアルの開発

抄録

The purpose of this study is to investigate the mechanical and tribological properties of carbon fiber (CF) and carbon nanotube (CNT) reinforced bismaleimide-based polyimide (PI) composites to develop the tribomaterials based on fiber reinforced PI composites. Thermosetting type commercially bismaleimide-based PI was used as a matrix polymer for composite materials. CF and CNT were used as a reinforcement fiber. CF/PI and CF/CNT/PI composites were manufactured by defibration of fiber, pre-forming, dry mixing, hot press molding (compression-molded) and heat treatment. Mechanical properties were measured by three-point bending test and tribological properties were evaluated by the ring-on-plate type sliding wear test under dry condition at 23 oC and 100 oC. It was found that bending strength and modulus of CF/PI composites decrease when filled with CNT. On the other hand, the influence of addition of CNT on the tribological properties, namely frictional coefficient and specific wear rate, of CF/PI composites differed for each tribological property. In particular, specific wear rate improved when filled with CNT. This may be attributed to change in the wear mechanism of CF/PI composites according to CNT fills or not. On the other hand, the frictional coefficient of CF/PI and CF/CNT/PI composites at 100 oC is lower than that of 23 oC. However, the specific wear rate of these composites at 100 oC is higher than that of 23 oC.