添加Y_2O_3对激光熔覆原位合成TiB_2和TiC增强镍基复合涂层组织的影响  

Effect of Adding Y_2O_3 on Microstructure of TiB_2 and TiC Reinforced Ni-Based Composite Coating In-Situ Synthesized by Laser Cladding

作　　者：张瑄珺[1] 李军[1] 王慧萍[1] 李曼萍[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《机械工程材料》2012年第7期17-20,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51002093);上海市重点学科建设项目(J51402)

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。TiB2 and TiC particles reinforced Ni-based composite coatings were in-situ synthesized by laser cladding on Ti6A14V alloy surface. The effect of adding 2wt% Y2 O3 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 Y2 O3, the size of reinforcement phase TiB2 was refined greatly and and a new phase Ni3 Y 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 teeame.

关 键 词：激光熔覆 原位合成 复合涂层 组织 

分 类 号：TG178[金属学及工艺—金属表面处理]