添加Y2O3对激光熔覆原位合成TiB2和TiC增强镍基复合涂层组织的影响
Effect of Adding Y2O3 on Microstructure of TiB2 and TiC Reinforced Ni-Based Composite Coating In-Situ Synthesized by Laser Cladding
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摘要: 在Ti6Al4V合金表面激光熔覆原位合成了TiB2和TiC颗粒增强镍基复合涂层, 通过X射线衍射仪、光学显微镜和扫描电镜以及能谱仪研究了添加2%(质量分数)Y2O3对涂层组织的影响。结果表明: 未添加Y2O3的涂层由增强相、少量如CrB和基体组织组成; 添加Y2O3后, 涂层中增强相TiB2的尺寸显著细化且有新相Ni3Y生成, CrB化合物数量减少, 涂层与基底形成冶金结合, 且界面更平整、致密, 成分过渡区有一定程度的缩小。Abstract: TiB2 and TiC particles reinforced Ni-based composite coatings were in-situ synthesized by laser cladding on Ti6Al4V alloy surface. The effect of adding 2wt% Y2O3 content on microstructure of the coating was studied by X-ray diffraction, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. The results show that the coating without Y2O3 consisted of reinforcement phases, a small quantity of CrB and the substrate. After adding Y2O3, the size of reinforcement phase TiB2 was refined greatly and and a new phase Ni3Y was found, and the number of CrB compound decreased. A metallurgical bonding was formed between the coating and substrate and the interface became smoother and more compact. The composition transition zone was reduced to a certain extent tecame.