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<p>This work presents the tribological characteristics of compression-moulded GNP-filled PTFE composites under aqueous media. Virgin PTFE and graphene nanoplatelets (GNP)-filled PTFE composites containing 1, 3, and 5 weight per cent GNP were subjected to comparative tests while applying a constant load of 5 N in distilled water, sand-filled distilled water and ambient air environments. Results indicate that the environment significantly influences tribological behaviour while increasing GNP content enhances wear and friction resistance. The 5 wt% GNP/PTFE nanocomposite exhibited optimal performance in distilled water, achieving a 55.56% reduction in coefficient of friction (COF) and an 80% decrease in specific wear rate compared to virgin PTFE. Transitioning from ambient air to distilled water further reduced COF and specific wear rates by 17.72 and 58.03%, respectively. However, sand-filled distilled water increased COF by 20.25% and specific wear rate by 159.26% for 5 wt% GNP/PTFE nanocomposite compared to dry sliding. Abrasive wear was identified as the primary failure mode across all test conditions. FESEM and EDS analyses of worn surfaces corroborate these findings, providing valuable insights into PTFE composite’s wear and friction characteristics in aqueous environments.</p>

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Tribological Properties of GNP/PTFE Nanocomposites Under Aqueous Media

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Ahmad Hafeeyi Mir,
  • M. S. Charoo

摘要

This work presents the tribological characteristics of compression-moulded GNP-filled PTFE composites under aqueous media. Virgin PTFE and graphene nanoplatelets (GNP)-filled PTFE composites containing 1, 3, and 5 weight per cent GNP were subjected to comparative tests while applying a constant load of 5 N in distilled water, sand-filled distilled water and ambient air environments. Results indicate that the environment significantly influences tribological behaviour while increasing GNP content enhances wear and friction resistance. The 5 wt% GNP/PTFE nanocomposite exhibited optimal performance in distilled water, achieving a 55.56% reduction in coefficient of friction (COF) and an 80% decrease in specific wear rate compared to virgin PTFE. Transitioning from ambient air to distilled water further reduced COF and specific wear rates by 17.72 and 58.03%, respectively. However, sand-filled distilled water increased COF by 20.25% and specific wear rate by 159.26% for 5 wt% GNP/PTFE nanocomposite compared to dry sliding. Abrasive wear was identified as the primary failure mode across all test conditions. FESEM and EDS analyses of worn surfaces corroborate these findings, providing valuable insights into PTFE composite’s wear and friction characteristics in aqueous environments.