Microstructure and tribological properties of WC-20Cr3C2-7Ni/8YSZ composite coatings by plasma spraying

doi:10.13251/j.issn.0254-6051.2023.02.040

Abstract

Abstract: In order to improve the service life of the pulling and straightening roller of the continuous caster, WC-20Cr₃C₂-7Ni+8YSZ composite coatings with different mass ratios were prepared on the surface of H13 steel by plasma spraying technology, and the microstructure, microhardness, scratch resistance, wear resistance and wear form of each coating were analyzed. The results show that the compactness of the composite coating is significantly increased by adding 30wt% or 50wt% 8YSZ into the WC-20Cr₃C₂-7Ni powder, and the coating grains are obviously refined. WC_1-x and W phases appear in WC-20Cr₃C₂-7Ni coating, and the crystallization strength of WC phase weakens with the addition of 8YSZ. The average hardness of WC-20Cr₃C₂-7Ni+30wt%8YSZ coating (1172 HV0.2) is not significantly changed relative to that of WC-20Cr₃C₂-7Ni coating (1152 HV0.2), but the hardness of WC-20Cr₃C₂-7Ni+50wt%8YSZ coating (1052 HV0.2) is decreased by 8.7% compared to that of WC-20Cr₃C₂-7Ni coating. The scratch resistance performance of WC-20Cr₃C₂-7Ni coating is weaker than that of the two composite coatings. The surface morphology of friction and wear changes from a large number of shedding pits to furrows, and the wear form also changes from fatigue wear to abrasive wear. The wear rate of WC-20Cr₃C₂-7Ni+30wt%8YSZ coating is 2.3×10^-5mm³/(N·m), which is about 50% less than WC-20Cr₃C₂-7Ni and WC-20Cr₃C₂-7Ni+50wt%8YSZ coatings. The composite coatings are prepared on the surface of the straightening roll of the continuous casting machine and applied in production practice. The test data show that the surface temperature of WC-20Cr₃C₂-7Ni and the addition of 30wt% and 50wt%8YSZ coatings are reduced by 40.4 ℃, 97.2 ℃ and 127 ℃, respectively. Their working life are increased by 73.3%, 133.3% and 100%, respectively, compared with conventional pull rollers.

Key words: WC-20Cr₃C₂-7Ni, 8YSZ, composite coating, frictional wear, microstructure, application

CLC Number:

TG174.44

Zhu Donglin, Sun Dengyue, Yang Jiahui, Yan Chaopeng, Wu Yanfei, Qing Xiaokang. Microstructure and tribological properties of WC-20Cr₃C₂-7Ni/8YSZ composite coatings by plasma spraying[J]. Heat Treatment of Metals, 2023, 48(2): 256-262.

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Microstructure and tribological properties of WC-20Cr₃C₂-7Ni/8YSZ composite coatings by plasma spraying

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