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.
作者
曹妙聪
徐强
朱勤文
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)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
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)。
关键词
激光熔覆
金刚石涂层
组织
磨削性能
Electrochemical deposition
Diamond coating
Microstructure
Grinding performance
