Study On Polymer Matrix Antifriction And Wearable Composites

In this paper, Bismaleimide(BMI) resin was modified by diamine(DDM) epoxy resin(E-5l) and modifying agent A which hax better wearability. The modifying mechanism was analyzed by infrared spectrum (IR). The best prescription was made certain by comparing the bend strength, impact strength and Martin heat-resistant temperature. The modified resin has its best performance when BMI/DDM /A/EP is 30/15/10/55wt. Its bend strength is 144.1 MPa, impact strength is 13.5 kJ/m2 and Martin heat-resistant temperature is 160℃.And the heat decompounding temperature of the resin is 350℃ ,which is confirmed by the TGA of cured resin. The results show that the modified BMI has better mechanical performance and heat-resistance.The CF/modified BMI wearable composite was prepared by using the modified BMI as matrix, graphite and MoS2 as solid lubricating agents, and carbon fiber (CF) as reinforcing material. The results of friction and wear test showed that this wearable composite has lower wear rating, but has bigger friction coefficient. So this wearable composite can use as common wearable composite, the friction coefficient is bigger if it is used as antifriction and wearable composite. At the same time, the study shows that adding 30wt CF has little influence on friction coefficient of bismaleimide matrix wearable composite, but it can reduce the wear rating greatly.To reduce the friction coefficient of bismaleimide resin matrix wearable composite and get better antifriction and wearable composite, the idea of modified BMI blending with ultra high molecular weight polyethylene(UHMWPE) resin powders is put forward in this paper. This wearable composite was prepared by using the moulding pressing technology. And the mould pressing parameters were found out. The friction and wear performance and wear mechanism of wearable composite varying with the content of UHMWPE, graphite, and CF are studied recuring to friction and wear tests, TGA and SEM. At last, the best prescription of antifriction and wearable composite was found out. The friction coefficient of the composite prepared according to the best prescription is only 0.11 , the wear rating is only 0.38 X 10-13 m3 N-1 m-1 at 100℃. And at 150℃, the friction is 0.25, the wear rating is 1.0 X 10-13m 3 N-1 m-1. So this composite has perfect antifriction and wearable ability at 100℃,and better antifriction and wearable ability at 150℃. The mechanical performance is good, and no distortion happened at 150℃. That is to say, their heat-resistance and wearability can complement each other by blending of modified BMI and UHMWPE. The wearable composite not only has perfect antifriction and wearable ability, but also has better heat-resistance.