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<p>Valued for their high hardness and chemical stability, diamond-like carbon (DLC) coatings are crucial to advancing product quality and application range in electronics, optics, and biomedicine. This study investigates the tribological performance of DLC coatings on SUS316L substrates against four metallic counterparts (brass, SUS316L, AISI 52100, K20) under dry sliding conditions. The DLC coatings demonstrate superior friction reduction, with average coefficients of friction (COF) between 0.10 and 0.18, decreasing by 30-45% as counterpart hardness increases. Raman spectroscopy reveals a tribologically induced sp3-to-sp2 transformation, correlating with reduced COF. Adhesive wear dominates, with severity dependent on counterpart hardness: Brass-DLC pairs exhibit severe material transfer, while K20-DLC pairs show minimal wear due to suppressed plastic deformation. AISI 52100-DLC pairs display pronounced oxidative wear (8.7-10.8% oxygen content). Thermomechanical simulations and experimental characterization jointly validate that reciprocating frequency dominates temperature rise while counterpart hardness controls stress distribution, revealing decoupled thermal-mechanical responses at the tribo-interface. These findings provide a framework for optimizing DLC coatings by tailoring counterpart materials and operating conditions.</p>

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Friction Reduction and Wear Resistance of DLC Coatings: Time-Series Analysis, Characterization, and Thermomechanical Simulation

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Xin Zhang,
  • Yi Tao,
  • Liuchen Wu,
  • Wenxiao Wang,
  • Keyi Zhang,
  • Xiao Kang

摘要

Valued for their high hardness and chemical stability, diamond-like carbon (DLC) coatings are crucial to advancing product quality and application range in electronics, optics, and biomedicine. This study investigates the tribological performance of DLC coatings on SUS316L substrates against four metallic counterparts (brass, SUS316L, AISI 52100, K20) under dry sliding conditions. The DLC coatings demonstrate superior friction reduction, with average coefficients of friction (COF) between 0.10 and 0.18, decreasing by 30-45% as counterpart hardness increases. Raman spectroscopy reveals a tribologically induced sp3-to-sp2 transformation, correlating with reduced COF. Adhesive wear dominates, with severity dependent on counterpart hardness: Brass-DLC pairs exhibit severe material transfer, while K20-DLC pairs show minimal wear due to suppressed plastic deformation. AISI 52100-DLC pairs display pronounced oxidative wear (8.7-10.8% oxygen content). Thermomechanical simulations and experimental characterization jointly validate that reciprocating frequency dominates temperature rise while counterpart hardness controls stress distribution, revealing decoupled thermal-mechanical responses at the tribo-interface. These findings provide a framework for optimizing DLC coatings by tailoring counterpart materials and operating conditions.