Microstructure and Abrasive Wear Behavior of Atmospheric Plasma Sprayed Ni20Cr4B2C Coatings and Anealing Strengthening

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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; postgraduate Xin-Ru Li, lixinru@mail.xjtu.edu.cn;

The previous investigations reveal that a dense Ni-based alloy coating significantly reduced oxide content can be deposited by atmospheric plasma spraying (APS) using boron-alloyed powders.In this study, a strengthening strategy to the coating hardness and wear performance is proposed by adding carbon besides boron to generate in-situ hard reinforcement phases while ensuring an low-oxide microstructure.A Ni20Cr4B2C coating was deposited by APS.The microstructure, hardness and abrasive wear of the coating were characterized. To improve the  brittleness of the as-sprayed coating and adjust the precipitation and dispersed distribution of hard phases, the coating was annealed in argon atmosphere. Results showed that the coating presents a dense microstructure of low oxide content and a microhardness of 1128 HV. After annealing at 700°C (2 h), although the hardness of the coating was reduced to 1034HV, the abrasive wear resistance was significantly enhanced compared with the as-sprayed coating.The results reveal that the wear resistance was increased by a factor of ten and four compared with that of 304SS substrate and the as-sprayed coating, respectively. The present study reveals that the properties of Ni-based coating can be significantly controlled by alloying of boron and carbon for high-performance abrasive wear applications.

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March 2026

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