Effect of w(Ti+B4C+C)/w(Ni60A) on Structure and Performance ofNickel-Based Composite Coating by Plasma Cladding
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摘要: 以Ni60A合金粉、钛（Ti）粉、石墨（C）粉和B4C粉为原料，其中w（Ti+B4C+C）/w（Ni60A）（w为质量分数/%）分别为0：100，10：90，20：80，30：70，采用反应等离子熔覆技术在304不锈钢表面制备镍基复合涂层，研究了w（Ti+B4C+C）/w（Ni60A）对涂层成形性、显微组织、硬度和耐磨性能的影响。结果表明：添加Ti+B4C+C的镍基复合涂层与基体呈冶金结合，且主要由（Ni，Fe）、CrB、TiC和Cr3Si相组成；增大w（Ti+B4C+C）/w（Ni60A）会增加强化相析出量，降低成形性；CrB在涂层中下部呈灰黑色细长条状，在上部呈细小块状或棒状，TiC主要以细小颗粒弥散分布于涂层中；当w（Ti+B4C+C）/w（Ni60A）为20：80时，涂层综合性能较优，平均显微硬度最高（948 HV），磨痕截面面积约为纯Ni60A合金涂层的1/5；镍基复合涂层主要发生黏着磨损和氧化磨损。Abstract: With Ni60A alloy, Ti, graphite (C), and B4C powders as raw materials and adjusting w(Ti+B4C+C)/w(Ni60A) (w is mass fraction/%) to 0:100, 10:90, 20:80 and 30:70, nickel-based composite coatings were synthesized by reactive plasma cladding on surface of 304 stainless steel. The effects of w(Ti+B4C+C)/w(Ni60A) on the formability, microstructure, hardness and wear resistance of the coating were studied. The results show that the nickel-based composite coatings with Ti+B4C+C were metallurgically bonded to the substrate, and were mainly composed of (Ni, Fe), CrB, TiC and Cr3Si. Increasing w(Ti+B4C+C)/w(Ni60A) improved the precipitation of strengthening phases and decreased the formability. CrB dispersed in the middle and lower part of the coating in gray-black slender strip forms, while in the upper part in small block or rod forms. TiC dispersed in the coating in fine particle forms. When w(Ti+B4C+C)/w(Ni60A) was 20:80, the comprehensive performance of the coating was relatively good; the average microhardness was the highest (948 HV) and the cross-sectional area of the wear scar was about 1/5 that of the pure Ni60A alloy coating. Adhesive wear and oxidative wear mainly occurred in nickel-based composite coatings.
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Keywords:
- reactive plasma cladding /
- nickel-based alloy coating /
- TiC /
- microhardness /
- wear resistance
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