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<p>In this study, WC/NiCu composite coatings with micron and nano WC particles were prepared using the directed energy deposition (DED) technique. The effect of WC particle size on the properties of NiCu alloys was investigated. The experimental results reveal that the micron WC particles underwent microfusion, inducing localized refinement within the coating. In comparison, the carbides formed from nano WC particles were distributed throughout the coating, which effectively contributed to the development of a finer grain structure in the nano WC/NiCu composite coatings. Between the two types of composite coatings, the micron WC/NiCu coating exhibited superior performance in terms of hardness, wear resistance, and corrosion resistance. In WC/NiCu coatings, micron WC particles largely retain their original structure, showing minimal interaction with the matrix. In contrast, nano WC particles melt extensively and react with matrix elements to form carbides. The microhardness of the micron WC/NiCu composite coating exhibited a 13.14% enhancement in comparison to that of the nano WC/NiCu composite coating. Under applied loads of 90&#xa0;N, 120&#xa0;N, and 150&#xa0;N, the average coefficient of friction for the micron WC/NiCu composite coating decreased by 19.61%, 19.03%, and 23.02%, respectively, in comparison to the nano WC/NiCu composite coating. The uniform dispersion of micron WC particles and the reduced grain boundary density in the micron WC/NiCu composite coatings contributed to enhanced corrosion resistance, evidenced by a 38.16% increase in R<sub>p</sub> and a 51.29% reduction in I<sub>corr</sub>.</p> Graphical Abstract <p></p>

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Comparative Study on the Enhancement of the Tribological and Corrosion Resistance of NiCu Alloys Reinforced with Micron/Nano WC Particles

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Shengnan Chen,
  • Tianqi Wang,
  • Yanli Su,
  • Jianbo Lei,
  • Yan Fang,
  • Xin Chen

摘要

In this study, WC/NiCu composite coatings with micron and nano WC particles were prepared using the directed energy deposition (DED) technique. The effect of WC particle size on the properties of NiCu alloys was investigated. The experimental results reveal that the micron WC particles underwent microfusion, inducing localized refinement within the coating. In comparison, the carbides formed from nano WC particles were distributed throughout the coating, which effectively contributed to the development of a finer grain structure in the nano WC/NiCu composite coatings. Between the two types of composite coatings, the micron WC/NiCu coating exhibited superior performance in terms of hardness, wear resistance, and corrosion resistance. In WC/NiCu coatings, micron WC particles largely retain their original structure, showing minimal interaction with the matrix. In contrast, nano WC particles melt extensively and react with matrix elements to form carbides. The microhardness of the micron WC/NiCu composite coating exhibited a 13.14% enhancement in comparison to that of the nano WC/NiCu composite coating. Under applied loads of 90 N, 120 N, and 150 N, the average coefficient of friction for the micron WC/NiCu composite coating decreased by 19.61%, 19.03%, and 23.02%, respectively, in comparison to the nano WC/NiCu composite coating. The uniform dispersion of micron WC particles and the reduced grain boundary density in the micron WC/NiCu composite coatings contributed to enhanced corrosion resistance, evidenced by a 38.16% increase in Rp and a 51.29% reduction in Icorr.

Graphical Abstract