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<p>Although polytetrafluoroethylene (PTFE) has excellent thermal resistance, corrosion resistance, and self-lubricating properties, its poor wear resistance limits its application in tribological components. In this study, PTFE/PPS and PTFE/nano-MWO<sub>3</sub>/PPS composites were prepared by cold-press sintering, and the composite systems of PPS and surface-modified nano-WO<sub>3</sub> synergistically filled with PTFE were realized. Meanwhile, the effect of polyphenylene sulfide (PPS) content on the mechanical and tribological properties of the composites was investigated. The results showed that the addition of PPS significantly enhanced the hardness of PTFE composites. The tribological properties of PTFE/PPS composites first decreased and then increased with increasing PPS content, with composites containing 5&#xa0;wt.% PPS exhibiting excellent friction and wear performance. Moreover, PPS and nano-MWO<sub>3</sub> showed a synergistic effect in the improved properties of PTFE, with the optimal performance of PTFE/nano-MWO<sub>3</sub>/PPS composites achieved at 7.5&#xa0;wt.% PPS and 5&#xa0;wt.% nano-MWO<sub>3</sub>. The proposed component distribution and wear model of PTFE-based composites reveal that nano-MWO<sub>3</sub> plays the role of skeleton and load-bearing in the system, while PPS enhances the bonding between nano-MWO<sub>3</sub> and PTFE. These findings could offer better insights for the development of advanced engine sealing materials.</p>

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Investigation on Mechanical Properties and Tribological Characteristics of PTFE Composites by the Filler of PPS and Surface-Modified Nano-WO3

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Xuhang Lin,
  • Bo Liu,
  • Fuyun Cui,
  • Sen Liu,
  • Da Bian,
  • Shanhua Qian

摘要

Although polytetrafluoroethylene (PTFE) has excellent thermal resistance, corrosion resistance, and self-lubricating properties, its poor wear resistance limits its application in tribological components. In this study, PTFE/PPS and PTFE/nano-MWO3/PPS composites were prepared by cold-press sintering, and the composite systems of PPS and surface-modified nano-WO3 synergistically filled with PTFE were realized. Meanwhile, the effect of polyphenylene sulfide (PPS) content on the mechanical and tribological properties of the composites was investigated. The results showed that the addition of PPS significantly enhanced the hardness of PTFE composites. The tribological properties of PTFE/PPS composites first decreased and then increased with increasing PPS content, with composites containing 5 wt.% PPS exhibiting excellent friction and wear performance. Moreover, PPS and nano-MWO3 showed a synergistic effect in the improved properties of PTFE, with the optimal performance of PTFE/nano-MWO3/PPS composites achieved at 7.5 wt.% PPS and 5 wt.% nano-MWO3. The proposed component distribution and wear model of PTFE-based composites reveal that nano-MWO3 plays the role of skeleton and load-bearing in the system, while PPS enhances the bonding between nano-MWO3 and PTFE. These findings could offer better insights for the development of advanced engine sealing materials.