Y_(2)O_(3)对WC/Ni60梯度复合涂层组织及性能的影响  

Effect of Y_(2)O_(3)on Microstructure and Properties of WC/Ni60 Gradient Composite Coatings

作　　者：姚芳萍[1] 薛胜利 李金华[1] 明智 杨宇航 YAO Fang-ping;XUE Sheng-li;LI Jin-hua;MING Zhi;YANG Yu-hang(School of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhou 121001,China)

机构地区：[1]辽宁工业大学机械工程与自动化学院,辽宁锦州121001

出　　处：《稀有金属与硬质合金》2023年第6期39-46,52,共9页Rare Metals and Cemented Carbides

基　　金：辽宁省教育厅基本科研项目(LZMKZ20220969,LZMKZ20220972)。

摘　　要：利用激光熔覆原位生成方法在H13钢表面制备了不同Y_(2)O_(3)含量的WC/Ni60复合涂层,分析其宏观形貌、显微组织、显微硬度得出最佳Y_(2)O_(3)添加量,分析了最佳Y_(2)O_(3)添加量的WC/Ni60梯度复合涂层的物相组成、显微组织、显微硬度及磨损机理。结果表明,复合涂层的显微硬度随Y_(2)O_(3)含量的增加呈先上升后下降的趋势;当Y_(2)O_(3)含量为1.5%时,涂层的宏观质量最好,晶粒得到细化,显微硬度最大;当Y_(2)O_(3)含量继续增加后,涂层中的WC颗粒再次变大,显微硬度有所降低。稀土掺杂梯度复合涂层较未添加稀土的梯度复合涂层厚度有所减小,显微组织形态和分布均发生了一些变化,且内部增强相颗粒更加细密均匀,棱角有所钝化,各层显微硬度从上至下分别增加49.2、75.78、72.78HV0.5,不同时间下的磨损量均有所减少,磨损机理仍为黏着磨损、脆性剥落和磨粒磨损。Ni60/WC composite coatings with different Y_(2)O_(3)contents were prepared on the surface of H13 steel by laser cladding in-situ generation method,and the macrostructure,microstructure,and microhardness of the coatings were analyzed to find the optimal Y_(2)O_(3)addition.And the phase composition,microstructure,microhardness,and wear mechanism of the WC/Ni60 gradient composite coatings with the optimal Y_(2)O_(3)addition were also investigated.The results show that the microhardness of the composite coatings presents a trend of increasing at first and then decreasing with the increase of Y_(2)O_(3)content.When the Y_(2)O_(3)content is 1.5%,the macroscopic quality of the coatings reaches the best with refined grains and the largest microhardness.And when the Y_(2)O_(3)content continues to increase,the WC particles in the coatings become larger again while the microhardness decreases.Compared with gradient composite coatings without the addition of rare earth,the thickness of the gradient composite coatings doped with rare earth is reduced,and the morphology and distribution of the microstructure undergo some changes.And the internal enhancement phase particles become finer and more uniform with the angles being blunted,and the microhardness of each layer from top to bottom increases by 49.2 HV_(0.5),75.78 HV_(0.5),and 72.78 HV_(0.5),respectively.The wear loss receives a decrease for different time,and the wear mechanism still consists of adhesive wear,brittle spalling,and abrasive wear.

关 键 词：激光熔覆 稀土掺杂 梯度复合涂层 显微组织 显微硬度 磨损机理 

分 类 号：TG146[一般工业技术—材料科学与工程]