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<p>WC-based metal-ceramic coatings are widely used in cavitation erosion environments, where their service performance is primarily determined by their microstructural characteristics. Sintering serves as a crucial method for optimizing the coating microstructure. This study employed an innovative short-time vacuum sintering process for post-treating HVAF-sprayed WC-Ni60-Co-Cr coatings. Results showed that the coating treated at 1120&#xa0;°C exhibited the best cavitation erosion resistance, demonstrating a cumulative mass loss of only 22.5% compared to the as-sprayed state, with the maximum erosion depth decreasing from 29.08&#xa0;μm to 1.26&#xa0;μm. This significant improvement was attributed to temperature-driven diffusion acceleration and phase transformation, which were critical for achieving rapid coating densification. These findings provide a novel approach for developing efficient coating post-treatment processes while offering valuable insights into the cavitation erosion mechanisms of thermally post-treated WC-based coatings.</p> Graphic Abstract <p></p>

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Accelerated Microstructural Evolution and Enhanced Cavitation Resistance of HVAF-Sprayed WC-Ni60-Co-Cr Coatings Via Short-Time Vacuum Sintering

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Zheyu He,
  • Tong Zhuang,
  • Junxiao Xu,
  • Tonghan Yang,
  • Bohan Xu,
  • Huichao Zhu,
  • Yongjun Hu

摘要

WC-based metal-ceramic coatings are widely used in cavitation erosion environments, where their service performance is primarily determined by their microstructural characteristics. Sintering serves as a crucial method for optimizing the coating microstructure. This study employed an innovative short-time vacuum sintering process for post-treating HVAF-sprayed WC-Ni60-Co-Cr coatings. Results showed that the coating treated at 1120 °C exhibited the best cavitation erosion resistance, demonstrating a cumulative mass loss of only 22.5% compared to the as-sprayed state, with the maximum erosion depth decreasing from 29.08 μm to 1.26 μm. This significant improvement was attributed to temperature-driven diffusion acceleration and phase transformation, which were critical for achieving rapid coating densification. These findings provide a novel approach for developing efficient coating post-treatment processes while offering valuable insights into the cavitation erosion mechanisms of thermally post-treated WC-based coatings.

Graphic Abstract