Effect of Post-Heat Treatment on Microstructure and Abrasive Wear Behavior of Atmospheric Plasma Sprayed Ni20Cr4B2C Coatings

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Dr. zhenyu zhang, zzy3123302138@stu.xjtu.edu.cn; Prof. Chang-Jiu Li, licj@mail.xjtu.edu.cn; Prof. Xiao-tao Luo, luoxiaotao@mail.xjtu.edu.cn; 

Existing research demonstrates that the addition of boron or carbon as deoxidizing elements enables atmospheric plasma spraying to produce metal coatings with significantly reduced oxide content, based on this result, this study introduces a design strategy that proactively utilizes a significant excess of these elements to leverage the surplus B and C to generate in-situ hard reinforcement phases while ensuring an low-oxide microstructure. A novel Ni20Cr4B2C coating was fabricated by APS,the coating displayed an low-oxide microstructure with a remarkable microhardness of 1128 HV.To mitigate as-sprayed brittleness and promote the precipitation and dispersed distribution of secondary phases, argon-protected heat treatments were conducted. Results showed that heat treatment significantly enhanced toughness. Specifically, the coating treated at 700 °C (2 h) maintained a hardness of 1034HV, offering an optimal balance of mechanical properties.Comparative abrasive wear testing against a 304 stainless steel substrate revealed that the 700 °C heat-treated coating exhibited the lowest wear rate ,approximately one-tenth that of the 304SS substrate. The study confirms that the Ni20Cr4B2C coating is a promising candidate for high-performance abrasive wear applications.

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March 2026

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