金刚石表面激光熔覆Cu-金刚石超硬涂层的组织及摩擦性能  

Surface Modification of Tungsten Steel with Laser Cladded Cu-Diamond Bilayers

作　　者：曹妙聪[1] 徐强[1] 朱勤文[2] Cao Miaocong;Xu Qiang;Zhu Qinwen(Changchun Institute Of Technology,College of exploration and Mapping Engineering,Changchun 130011,China;Gemmological Insitute China University of Geosciences,Wuhan 430065,China)

机构地区：[1]长春工程学院勘查与测绘工程学院,长春130011 [2]中国地质大学珠宝学院,武汉430065

出　　处：《真空科学与技术学报》2020年第7期614-618,共5页Chinese Journal of Vacuum Science and Technology

基　　金：吉林省教育科学规划课题(GH19186)。

摘　　要：为了提高金刚石刀具的耐摩擦性能,利用激光熔覆在其表面制得Cu-金刚石的涂层,实验测试分析了涂层的组织及摩擦性能。研究结果表明:涂层形成了清晰的断面结构,涂层能够和硬质合金形成紧密结合状态,并没有发生剥落。经测试发现单层涂层的厚度约30μm,双层涂层厚度约50μm,并且双层涂层形成了更致密的上砂量。大部分金刚石颗粒都是沉积在涂层的(101)晶面,添加金刚石颗粒后并没有引起Cu晶体组织的改变。单层涂层形成了宽度较大而深度较小的众多表面犁沟结构,双层涂层在磨损表面形成了许多深度较大并且密集分布犁沟,表现出更优的耐磨特性。双层结构涂层摩擦测试也表现为先减小后到达3 min之后则表现为规律变化的特征。Herein,we reported the surface modification of tungsten steel(FX1020),an advanced super-hard cutting tool material,with laser-cladded diamond coatings on Cu-transition layer,pre-covered by electrochemical deposition or by laser cladding.The influence of the Cu-transition layer on the interfacial microstructures/adhesion/stress and tribological behavior was investigated with X-ray diffraction,scanning electron microscopy and conventional mechanical probes.The preliminary results show that the Cu-transition layer had a major impact.Specifically,the FCC-structured Cu-layer,forming well-defined Cu/steel interface,significantly enhanced the interfacial adhesion and decreased the interfacial stress.As expected,the laser cladded single-layer/bilayer of diamond particles,adhesively embedded in Cu-layer,displayed excellent tribological properties,including the higher hardness,stronger wear-resistance and lower friction coefficient.Besides,the 50μm-thick diamond bilayer outperforms the 30μm-thick single diamond layer because of the much greater wear-resistance,larger elastic modulus,more compactness and higher density of diamond particles.

关 键 词：激光熔覆 金刚石涂层 组织 磨削性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]