非连续金刚石/Ta基碳化物复合涂层结构及性能  

Structure and properties of discontinuous diamond/Ta-based carbide composite coating

作　　者：曹锋 高洁[1] 刘红军 王永胜[1] 黑鸿君[1] 于盛旺[1] 刘克昌 CAO Feng;GAO Jie;LIU Hong-jun;WANG Yong-sheng;HEI Hong-jun;YU Sheng-wang;LIU Ke-chang(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Uroica Mining Security Engineering Co.,Ltd.,Tai'an 271000,China;Huayang New Material Technology Group Co.,Ltd.,Yangquan 045000,China)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]尤洛卡精准信息工程股份有限公司,泰安271000 [3]华阳新材料科技集团有限公司,阳泉045000

出　　处：《中国有色金属学报》2023年第3期839-849,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51901154);山西省科技重大专项资助项目(20181102013);山西省自然科学基金资助项目(201901D211092);山西省“1331工程”资助项目。

摘　　要：为提升硬质合金的硬度和耐磨性,改善其与金刚石涂层的结合强度,先用双辉等离子表面合金化技术在其表面制备Ta金属层,再用化学气相沉积法对Ta金属层进行碳化-沉积复合处理,制备出非连续金刚石/Ta基碳化物复合涂层。研究了源极与工件极电位差对金属层的影响以及复合涂层的结构与性能。结果表明:制备的金属层均由连续致密的胞状α-Ta组成;随电位差的增大,Ta金属层的显微硬度和结合强度均先升高后降低;电位差为240 V时,Ta金属层的显微硬度和结合力最高,分别达1151HV0.2和117 N;碳化-沉积后,涂层由表面离散分布的非连续金刚石颗粒和TaxC(TaC、Ta2C)组成,其显微硬度提高至基体的1.8倍,磨损率仅为基体的45%。非连续金刚石/Ta基碳化物复合涂层具有良好的结合性能,能有效提升硬质合金的硬度和耐磨性能。To improve the hardness and wear resistance of cemented carbide and improve its bonding strength with the diamond coating,Ta metallic layers were first prepared onto its surface via double-glowed plasma surface alloying method.And then,the Ta metallic layer was carbonized and deposited into discontinuous diamond/Ta-based carbide composite coating by chemical vapor deposition.The effect of the potential difference between the source and the workpiece on the Ta metallic layers and the microstructure and properties of the composite coating were researched.The results show that the metallic layers prepared consist of continuous and dense cellularα-Ta.With the increase of the potential difference,both the microhardness and the bonding property of Ta metallic layers first become stronger and then weaker.When the potential difference is 240 V,the hardness and bonding force of Ta metallic layers are the highest ones,reaching 1151HV0.2 and 117 N,respectively.After the carbonization and deposition,the composite coating is composed of discretely distributed discontinuous diamond particles and the TaxC(TaC,Ta2C)on the surface.The microhardness is increased to about 1.8 times that of the substrate.And the wear rate is about 45%of that of the substrate.It could be illustrated that the discontinuous diamond/Ta-based carbide composite coating has good bonding properties and can effectively improve the hardness and wear resistance of cemented carbide.

关 键 词：硬质合金 双辉等离子表面合金化 非连续金刚石/Ta基碳化物复合涂层 碳化-沉积 耐磨性能 结合性能 

分 类 号：TG178[金属学及工艺—金属表面处理]