利用MHK-500型环-块磨损试验机,对陶瓷颗 粒SiC、Si3N4、BN和B2O3填充的聚四氟乙烯(PTFE)复合材料在干摩擦条件下与GCr1 5 轴承钢对摩时的摩擦磨损性能进行了较为系统的研究,并利用扫描电子显微镜(SEM)和光学 显微镜对PTFE复合材料的摩擦表面进行了观察。结果表明,添加B2O3降低了PTFE的摩擦 系数,而添加SiC、Si3N4及BN则增大了PTFE的摩擦系数。但是,SiC、Si3N4、BN和B 2O3均可将PTFE的磨损量降低1～2个数量级,其中以Si3N4的减磨效果最好,B2O3 的减磨效果最差。
Friction and wear properties of polytetraf luoroethylene(PTFE) composites filled with SiC, Si3N4, BN and B2O3 sliding against GCr15 bearing steel under dry friction conditions were studied by usi ng an MHK-500 ring-on-block wear tester, and the frictional surfaces of the PTFE composites were examined by using a scanning electron microscope and an optical microscope. Experimental results show that B2O3 reduces the friction coefficient of PTFE, but SiC, Si3N4 and BN increase the friction coefficient of PTFE. However, filling PTFE with SiC, Si3N4, BN and B2O3 can reduce the wear of PTFE by 1 to 2 orders of magnitude, but the wear-reducing action of Si 3N4 is the most effective, while that of B2O3 is the worst.
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