科研之友
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摘要
Polycarbonate (PC)/acrylonitrile butadiene styrene (ABS) composites with excellent comprehensive performance have been widely applied and studied, but their fretting wear resistance needs to be improved for automobile, electronics and marine applications. Two different forms of polytetrafluoroethylene (PTFE) particles (flake and spherical) were adopted to improve the fretting wear resistance of PC/ABS composites, and PC/ABS/PTFE composites were prepared by using a self-developed twin-eccentric rotor extruder. The effects of the two forms PTFE particles on the fretting wear resistance and mechanical properties of the composites were studied. Especially, the fretting wear behaviors of the composites with GCr15 ordinary steel and M30MN(2) marine steel balls as friction pairs were compared. The results indicate that the two different forms of PTFE particles were dispersed uniformly in the matrixes, and they can effectively improve comprehensive properties of the composites. Moreover, the flake PTFE has better improvement effects on the fretting wear resistance and mechanical properties of the composites, which accelerate the coefficient of friction and Kv values of PC/ABS composites decreased from 1.110 to 0.231 and from 22.33 to 1.41 (x 10(-3)mm(3)/N.m), respectively, and the impact strength increased by 85.7%. During fretting wear, fatigue and adhesive wear mainly occurs in PC/ABS composites, but only adhesive wear occurs when PTFE particles are added. In addition, during the wear process, the debris forms transfer film, which also improves the fretting friction performance of the PC/ABS composites.
