PHB与纳米Cu对PTFE/GF复合材料摩擦学性能的影响

Effect of PHB and Copper Nanoparticles on the Tribological Properties of PTFE/GF Composites

考察了聚苯酯(PHB)与纳米铜(Cu)协同改性对聚四氟乙烯/玻纤(PTFE/GF)复合材料摩擦磨损性能的影响,探讨了复合材料的磨损表面形貌及磨损机理。结果表明,当PHB质量分数为6%时,PTFE/GF/PHB复合材料的摩擦因数最低,达到0.175,但磨损率较大,为6.84×10-6mm3/(N.m)。在此基础上,采用PHB与纳米Cu复合改性PTFE/GF复合材料,当纳米Cu质量分数为0.3%和PHB质量分数为6%时,复合材料的摩擦学性能最佳,摩擦因数为0.194,磨损率仅为1.60×10-6mm3/(N.m)。纳米Cu的加入使复合材料的摩擦因数能较早达到平稳阶段。SEM分析表明,PTFE/GF复合材料表现为严重的磨粒磨损,磨损表面出现深且宽的犁沟;与PTFE/GF复合材料相比,PTFE/GF/PHB复合材料磨粒磨损得到极大改善,磨粒磨损程度大大减小;PTFE/GF/6%PHB/0.3%纳米Cu复合材料的磨损面更加光滑平整,表现为极轻微的磨粒磨损,耐磨性最好。

The effect of PHB and Copper nanoparticles （nano-Cu） on the friction and wear properties of polytetrafluoroethylene/glass fiber （PTFE/GF） composites was studied. The surface morphology and the wear mechanism of composites were discussed. The results showed that when PHB mass fractions was 6% , the friction coefficient of PTFE/GF composites was the lowest which was only O. 175, but the wear rate was 6.84 ×10^-6 mm3/（N · m）. On this basis, PHB and nano-Cu were commonly used to modify PTFE/GF composites. The friction coefficient was 0. 194 and the wear rate was 1.60 × 10 ^-6mm3/（N · m） when the content of nano-Cu was 0.3% and the content of PHB was 6%. The friction and wear properties were the best. The addition of nano-Cu made the friction coefficient of the composites showing flat and slight fluctuations in the trends over time. The SEM micrographs showed that PTFE/GF composites were severe abrasive wear and the wear surface presented the deep and wide furrows. Comparing with PTFE/GF composites, the abrasive wear of PTFE/GF/PHB composites had been greatly improved. The degree of abrasive wear was greatly reduced. PTFE/GF/6% PHB/0. 3% nano-Cu composites whose wear surfaces were relatively flat showed a very mild abrasive wear, it showed the best wear resistance.