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<p>Atmospheric plasma-sprayed (APS) Al<sub>2</sub>O<sub>3</sub> −40 wt.% TiO<sub>2</sub> coatings are extensively utilized in numerous industrial applications owing to their advantageous characteristics and economical processing methods. However, their tribological performance under sliding wear remains a critical factor influencing service life. The present study thoroughly examines the significance of laser surface treatment on the mechanical behavior, microstructural development, and sliding wear resistance of APS Al<sub>2</sub>O<sub>3</sub>−40TiO<sub>2</sub> coatings. Surface roughness and topographical characteristics of untreated and laser-treated coatings were systematically characterized, and a comprehensive analysis of wear track morphology was performed. Results indicate that laser treatment reduced surface roughness by 20.8%, significantly enhancing surface uniformity. Furthermore, laser-treated coatings exhibited a 52% reduction in wear volume loss compared to untreated counterparts, demonstrating substantially improved wear resistance. Microstructural characterization revealed that the laser-induced morphological changes enhance the coating’s resistance to wear-induced degradation and plastic deformation, underscoring the potential of laser remelting to extend the durability of ceramic-coated stainless-steel components in demanding environments.</p>

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Microstructural Evolution and Enhanced Wear Resistance of Laser-Treated Plasma-Sprayed Al2O3–40 wt.% TiO2 Coatings

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • S. Maharajan,
  • F. Michael Thomas Rex

摘要

Atmospheric plasma-sprayed (APS) Al2O3 −40 wt.% TiO2 coatings are extensively utilized in numerous industrial applications owing to their advantageous characteristics and economical processing methods. However, their tribological performance under sliding wear remains a critical factor influencing service life. The present study thoroughly examines the significance of laser surface treatment on the mechanical behavior, microstructural development, and sliding wear resistance of APS Al2O3−40TiO2 coatings. Surface roughness and topographical characteristics of untreated and laser-treated coatings were systematically characterized, and a comprehensive analysis of wear track morphology was performed. Results indicate that laser treatment reduced surface roughness by 20.8%, significantly enhancing surface uniformity. Furthermore, laser-treated coatings exhibited a 52% reduction in wear volume loss compared to untreated counterparts, demonstrating substantially improved wear resistance. Microstructural characterization revealed that the laser-induced morphological changes enhance the coating’s resistance to wear-induced degradation and plastic deformation, underscoring the potential of laser remelting to extend the durability of ceramic-coated stainless-steel components in demanding environments.