WC与TiC复合增强镍基涂层的组织和性能  

Microstructure and Properties of WC and TiC Composite Reinforcement Ni Based Coatings

作　　者：迟静[1] 王淑峰[1] 李敏[1] 吴杰[1] 韩野[1] CHI Jing;WANG Shufeng;LI Min;WU Jie;HAN Ye(College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学材料科学与工程学院,青岛266590

出　　处：《中国表面工程》2021年第1期85-96,共12页China Surface Engineering

基　　金：山东省自然科学基金资助项目(ZR2014EMM009)。

摘　　要：利用等离子熔覆技术制备Ni基涂层,用直接加入的WC和原位合成的TiC复合增强,分析原料体系中(Ti+C)和WC的含量变化对涂层物相组成、微观组织、显微硬度和滑动摩擦磨损性能的影响。结果表明:WC在熔池中溶解,分解出W和C,W扩散进入原位生成的TiC中,形成(Ti,W)C固溶体,W的扩散不充分使(Ti,W)C呈现核壳结构。随原料中(Ti+C)含量的增多(0~20%)和WC相应含量的减少(40%~20%),WC溶解程度增大,(Ti,W)C颗粒形貌由八面体转变为椭圆形;(Ti,W)C生成量的增多使涂层上部硬度提高,WC聚集沉底现象的减弱使涂层下部硬度下降,与基材Q235之间形成较平稳的硬度梯度。涂层耐磨损性能显著优于基材,当(Ti+C)和WC的含量分别为10%和30%时,涂层的磨损体积为基材的8.33%。The Ni-based coatings are prepared by plasma cladding technology,which are reinforced with directly added WC and in-situ synthesized TiC.The influences of the(Ti+C)and WC content changes in the raw materials on the phase composition,microstructure,microhardness and sliding friction and wear properties of the coatings are analyzed.WC dissolves in the molten pool and decomposes W and C.W diffuses into the in-situ TiC to form(Ti,W)C solid solution.The insufficient diffusion of W makes(Ti,W)C present a core-shell structure.With the increase of(Ti+C)content(0-20%)and the decrease of corresponding WC content(40%-20%),the solubility of WC increases,and the morphology of(Ti,W)C particle changes from octahedron to ellipse.With the increase of(Ti,W)C content,the hardness of the upper part of the coating increases,while the decrease of WC aggregation and sinking phenomenon makes the hardness of the lower part of the coating decrease,forming a relatively stable hardness gradient with the Q235 substrate.The wear resistance of the coating is significantly better than that of the substrate.When the content of(Ti+C)and WC are 10%and 30%respectively,the wear volume of the coating is 8.33%of the substrate.

关 键 词：NI基涂层 WC TIC 微观组织 硬度 摩擦磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]