金属硫化物及石墨填充PTFE 复合材料的摩擦磨损性能研究

利用MHK-500 型环-块磨损试验机, 对MoS₂、CuS、PbS 及石墨(添加量均为30 vo l% )填充的聚四氟乙烯(PTFE) 复合材料在干摩擦条件下与GCr15 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 复合材料的磨屑和摩擦磨损表面进行了观察。结果表明, 添加石墨降低了PTFE 的摩擦系数, 而添加MoS₂、CuS 及PbS则增大了PTFE 的摩擦系数; 同时, 添加MoS₂、CuS、PbS 及石墨均可将PTFE 的磨损量降低2 个数量级, 其中以PbS 的减磨效果为最好, 而MoS₂ 的减磨效果则最差。 

STUDY ON FRICTION AND WEAR PROPERTIES OF METAL SULFIDES AND GRAPHITE FILLED PTFE COMPOSITES

The friction and wear properties of polytetrafluoroethylene (PTFE) composites filled with MoS 2, CuS, PbS, and graphite (addition quantity is 30 vol% in volume fraction) sliding against GCr15 bearing steel under dry friction conditions were studied by using an MHK 500 ring block wear tester (Timken wear tester), then the wear debris and the frictional surfaces of these PTFE composites were examined by using a scanning electron microscope (SEM) and an optical microscope. Experimental results show that graphite reduces the friction coefficient of the PTFE, but MoS 2, CuS and PbS increase the friction coefficient of the PTFE. Meanwhile, filling PTFE with MoS 2, CuS, PbS, or graphite can reduce the wear of PTFE by 2 orders of magnitude, but the wear reducing action of PbS is the most effective, while that of MoS 2 is the worst. SEM and optical microscope investigations show that the MoS 2, CuS, PbS, and graphite not only prevent the banded structure of PTFE from destruction, but also enhance the adhesion of the transfer films to the counterfaces, so they greatly reduce the wear of the PTFE.