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通过在G111镍基自熔合金粉末中加入La2O3,利用氧-乙炔火焰喷涂工艺在Q235基体上制备熔覆涂层以提高其耐磨性。实验结果表明:添加适量的La2O3可细化熔覆涂层组织,提高熔覆涂层硬度和耐磨性,改善熔覆涂层和基体的结合状态。在一定范围内,熔覆涂层的表面硬度和耐磨性随La2O3含量的增多而显著提升,但其并不呈线性关系。当La2O3含量达到G111镍基自熔合金质量的0.6%时,熔覆涂层表面硬度和耐磨性均最佳,超过0.6%后,硬度和耐磨性反而会变差。
By adding La2O3 to G111 self-fluxing alloy powder, the overcoating coating was prepared on the Q235 matrix by oxy-acetylene flame spraying to improve the wear resistance. The experimental results show that adding appropriate amount of La2O3 can refine the microstructure of the coating, improve the hardness and wear resistance of the coating, and improve the bonding between the coating and the substrate. Within a certain range, the surface hardness and wear resistance of the cladding coatings increase significantly with the increase of La2O3 content, but not linearly. When the content of La2O3 reaches 0.6% of the G111 self-fluxing alloy, the surface hardness and wear resistance of the coating are the best. When the content of La2O3 exceeds 0.6%, the hardness and wear resistance will be worsened.