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<p>This study investigates the room-temperature tribological performance of cold-spray (CS) additively manufactured Cu-based composite coatings, including pure Cu, Cu-50 vol% Al₂O₃, and Cu-50 vol% Al₂O₃-10 vol% Ag, deposited on stainless steel substrates. Post-processing techniques, including heat treatment (HT), laser shock peening (LSP), and their combination (HT + LSP), were applied to study their influence on coating microstructure, porosity, and wear behavior. Dry and lubricated sliding tests were conducted using Al₂O₃ balls to analyze the frictional response. Results indicate that Al₂O₃ contributes to increased hardness and plowing resistance, while the addition of Ag enhances self-lubrication, particularly under LSP and HT + LSP conditions. Post-processing significantly reduced porosity and improved interfacial bonding, with the HT + LSP-treated Cu-Al₂O₃-Ag coatings showing the best overall tribological performance. The study provides insight into how material composition and post-processing synergistically affect friction mechanisms and coating integrity in Cu-based cermets.</p>

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Exploring the effect of post-processing on friction mechanisms in cold-sprayed Cu-Al₂O₃-Ag coatings

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Subin Antony Jose,
  • Pradeep L. Menezes

摘要

This study investigates the room-temperature tribological performance of cold-spray (CS) additively manufactured Cu-based composite coatings, including pure Cu, Cu-50 vol% Al₂O₃, and Cu-50 vol% Al₂O₃-10 vol% Ag, deposited on stainless steel substrates. Post-processing techniques, including heat treatment (HT), laser shock peening (LSP), and their combination (HT + LSP), were applied to study their influence on coating microstructure, porosity, and wear behavior. Dry and lubricated sliding tests were conducted using Al₂O₃ balls to analyze the frictional response. Results indicate that Al₂O₃ contributes to increased hardness and plowing resistance, while the addition of Ag enhances self-lubrication, particularly under LSP and HT + LSP conditions. Post-processing significantly reduced porosity and improved interfacial bonding, with the HT + LSP-treated Cu-Al₂O₃-Ag coatings showing the best overall tribological performance. The study provides insight into how material composition and post-processing synergistically affect friction mechanisms and coating integrity in Cu-based cermets.