Scholarlink

<p>To improve the reliability of solid lubricating coatings in engineering applications, this study systematically investigated the effects of substrate surface pretreatment, curing process and storage time on the tribological properties of epoxy-based molybdenum disulfide (MoS<sub>2</sub>) composite lubricating coatings. The coatings were prepared by a spray method, and their properties were characterized via ball-on-disc friction tests, white-light interferometry and scanning electron microscopy (SEM). The results showed that the coating on the substrate polished with 1000-grit sandpaper had superior wear resistance, as the moderate roughness increased the actual contact area and bonding energy between the coating and the substrate. The coating cured at 220&#xa0;°C for 30&#xa0;min exhibited the lowest steady-state friction coefficient (≈0.10) and the smallest wear scar under a load of 2 N and a rotational speed of 500&#xa0;rpm; this temperature enabled a balance between the crosslinking density and structural integrity of the epoxy resin, avoiding insufficient curing at low temperatures and resin carbonization and embrittlement at high temperatures. The wear resistance of the coating was significantly improved after room-temperature storage for 168&#xa0;h and 360&#xa0;h, with the wear scar width reduced from 580&#xa0;μm to 200 ~ 230&#xa0;μm and the depth from 16&#xa0;to 3&#xa0;μm. This was attributed to the relaxation of residual internal stress generated during curing and slight densification of the resin matrix microstructure during storage, which inhibited crack propagation under cyclic stress. This study defined a practical processing window for the coating and provided important guidance for its preparation, storage and reliability evaluation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Process optimization and storage-aging effects on the tribological performance of epoxy-based MoS2 composite lubricating coatings

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月24日

查看全文
  • Bo Gao,
  • Hanzhi Yao,
  • Ruizhe Li,
  • Yuting Zhao,
  • Xiang Liu,
  • Xianhao Gu,
  • Qiuying Chang

摘要

To improve the reliability of solid lubricating coatings in engineering applications, this study systematically investigated the effects of substrate surface pretreatment, curing process and storage time on the tribological properties of epoxy-based molybdenum disulfide (MoS2) composite lubricating coatings. The coatings were prepared by a spray method, and their properties were characterized via ball-on-disc friction tests, white-light interferometry and scanning electron microscopy (SEM). The results showed that the coating on the substrate polished with 1000-grit sandpaper had superior wear resistance, as the moderate roughness increased the actual contact area and bonding energy between the coating and the substrate. The coating cured at 220 °C for 30 min exhibited the lowest steady-state friction coefficient (≈0.10) and the smallest wear scar under a load of 2 N and a rotational speed of 500 rpm; this temperature enabled a balance between the crosslinking density and structural integrity of the epoxy resin, avoiding insufficient curing at low temperatures and resin carbonization and embrittlement at high temperatures. The wear resistance of the coating was significantly improved after room-temperature storage for 168 h and 360 h, with the wear scar width reduced from 580 μm to 200 ~ 230 μm and the depth from 16 to 3 μm. This was attributed to the relaxation of residual internal stress generated during curing and slight densification of the resin matrix microstructure during storage, which inhibited crack propagation under cyclic stress. This study defined a practical processing window for the coating and provided important guidance for its preparation, storage and reliability evaluation.