Nb对等离子熔覆NbC-WC/镍基复合涂层的组织性能的影响  

Effects of Nb on microstructure properties of NbC-WC composite coatings by plasma cladding

作　　者：梁斌 李敏[1] 薛均贤 陈琳琳 国增磊 LIANG Bin;LI Min;XUE Junxian;CHEN Linlin;GUO Zenglei(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,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2023年第3期70-75,共6页Journal of Shandong University of Science and Technology(Natural Science)

摘　　要：采用等离子熔覆技术成功制备了不同(Nb+C)/WC比例的镍基复合涂层,借助高分辨扫描电镜、X射线衍射仪、显微硬度计、室温干滑动摩擦磨损试验机、三维形貌仪对复合涂层的组织及力学性能进行了表征。实验结果表明,涂层底部区域存在未熔WC颗粒,随着Nb含量的增加,WC的溶解行为得到促进;涂层由NbC、WC、γ(Fe,Ni)和M_(23)C_(6)组成;当n(Nb+C)∶n(WC)=2∶2时,涂层拥有较高的显微硬度(~750 HV_(0.1))、较好的耐磨性能和相对光滑平整的磨损形貌;随着Nb的添加,涂层的磨损机制由粘着磨损转变为粘着磨损和磨粒磨损。Ni-based composite coatings with different(Nb+C)/WC ratios were successfully prepared by plasma cladding.The microstructure and mechanical properties of the composite coatings were characterized by high resolution scanning electron microscopy,X-ray diffractometer,microhardness tester,room temperature dry sliding friction and wear experimental equipment and three-dimensional morphology tester.The experimental results show that unmelted WC particles exist at the bottom of the coating and the dissolution behavior of WC is promoted with the increase of Nb content.The coatings is composed of NbC,WC,γ(Fe,Ni)and M_(23)C_(6).When the molar ratio of(Nb+C)and WC is 2∶2,the coating shows a higher microhardness(~750 HV_(0.1)),better wear-resisting property,and relatively smooth wear morphology.With the addition of Nb,the wear mechanism of the coatings change from adhesive wear into adhesive wear and abrasive wear.

关 键 词：等离子熔覆 碳化钨 碳化铌 镍基复合涂层 显微组织演化 磨损性能 

分 类 号：TG142[一般工业技术—材料科学与工程]