纳米SiC改性PTFE复合材料的力学与摩擦磨损性能  

Frictional and Mechanical Properties of PTFE Composites Filled with Nano-SiC

作　　者：路琴[1] 张静[1] 何春霞[1] 

机构地区：[1]南京农业大学工学院,江苏南京210031

出　　处：《材料科学与工程学报》2008年第5期743-745,782,共4页Journal of Materials Science and Engineering

基　　金：江苏省自然科学基金资助项目(BK2004103);江苏省农机局基金资助项目(gxz08011)

摘　　要：评价了用不同含量纳米SiC改性聚四氟乙烯(PTFE)复合材料的力学性能,利用MM-200型摩擦磨损试验机研究了纳米SiC含量对PTFE复合材料摩擦磨损性能的影响。借助于扫描电子显微镜观察分析了试样磨损表面形貌,并探讨其磨损机理。结果表明:纳米SiC能够提高PTFE复合材料的硬度,但复合材料的拉伸强度有所降低。纳米SiC能够增加PTFE复合材料的摩擦系数,降低其磨损量,当其质量分数为7%时,PTFE复合材料的耐磨损性能最佳。纳米SiC可以阻止PTFE带状结构的大面积破坏,以及在摩擦过程中于偶件表面能够形成转移膜并隔离复合材料与偶件的直接接触是减摩耐磨的主要原因。Effects of nano-SiC on friction and wear properties of polytetrafluoroethylene （PTFE） were investigated using an MM-200 wear tester. Mechanical performances of PTFE composites were measured. Experimental results show that nano-SiC could reduce wear and increase friction coefficient of PTFE. Furthermore, it also increased hardness but the tensile strength of the composites decreased to some extent. When content is 7% in weight, the wear performance of PTFE composites is optimal. Worn surfaces of nano-SiC filled PTFE composites were observed using a scanning electron microscope. The reasons that the wear of PTFE is decreased are probably that nano SiC resisted severe mangle of PTFE strip structure, and that film transferred from counterpart surface prevented direct contact between PTFE composites and steel ring.

关 键 词：纳米碳化硅 聚四氟乙烯 复合材料 力学性能 摩擦磨损性能 

分 类 号：TB332[一般工业技术—材料科学与工程]