埃洛石-玻纤/聚四氟乙烯复合材料的摩擦磨损热膨胀及力学性能

采用冷压成型烧结工艺制备出玻璃纤维（GF）和埃洛石（HNTs）填充的聚四氟乙烯（PTFE）复合材料。研究了填料类型及不同配比的填料对PTFE复合材料的界面、摩擦学性能、线膨胀系数及力学性能的影响。结果表明:适量填充HNTs可以提升GF/PTFE复合材料的摩擦磨损、热膨胀及力学性能。填充2.0%HNTs时的HNTs-GF/PTFE复合材料比GF/PTFE复合材料的磨损率降低32.7%，高温时HNTs-GF/PTFE复合材料的线膨胀系数（CTE）比纯PTFE降低近2个数量级，断裂伸长率、拉伸强度和弯曲强度分别提高40.0%、2.3%和7.1%。 

Friction wear thermal expansion and mechanical properties of halloysite-glass fiber/polytetrafluoroethylene composite

The polytetrafluoroethylene (PTFE) composite filled with glass fiber (GF) and halloysite (HNTs) were prepared by cold forming and sintering. The effects of the filler type and its matching on the interface, frictional property, linear expansion coefficient and mechanical property of PTFE composites were investigated. The results indicate that filling with HNTs suitably not only increases the friction property of GF/PTFE composites, but also causes the wear, thermal expansion and mechanical properties to increase. The wear rate of the HNTs-GF/PTFE ternary composite filled with 2.0% HNTs is reduced by 32.7% in comparison with GF/PTFE composite. The linear expansion coefficient (CTE) of this HNTs-GF/PTFE composite is reduced by almost 2 orders of magnitude compared with that of pure PTFE during high temperature. The elongation at break, tensile strength and bend strength of HNTs-GF/PTFE are improved by 40.0%, 2.3% and 7.1%, respectively.