CoCrMo和CoCrMoW合金的组织结构、力学性能及在小牛血清溶液中的腐蚀摩擦学性能研究  

Research on the Structural,Mechanical and Corrosion Tribological Properties of CoCrMo and CoCrMoW Alloys in Calf Serum Solution

作　　者：王江[1,2,3] 马玉天[1] 程少逸 张东[1] 孟军虎[3] 辛本斌[3] WANG Jiang;MA Yutian;CHENG Shaoyi;ZHANG Dong;MENG Junhu;XIN Benbin(National Key Laboratory for the Development and Comprehensive Utilization of Nickel Cobalt Co Associated Resources,Jinchuan Group Co.,Ltd.,Jinchang 737100,China;School of Materials Science and Engineering,Central South University,Changsha 410000,China;Research and Development Center for Advanced Lubrication and Protective Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]金川集团股份有限公司镍钴共伴生资源开发与综合利用全国重点实验室,甘肃金昌737100 [2]中南大学材料科学与工程学院,湖南长沙410000 [3]中国科学院兰州化学物理研究所先进润滑与防护材料研究发展中心,甘肃兰州730000

出　　处：《材料保护》2024年第7期73-84,共12页Materials Protection

基　　金：工信部生物医用材料创新任务揭榜挂帅项目;第十九批次西部之光访问学者培养任务;甘肃省重点人才项目(2022RCXM006);金川集团重点科研项目(2023-03)。

摘　　要：为了明确CoCrMo和CoCrMoW合金在小牛血清溶液中的腐蚀摩擦行为和耐腐蚀磨损机制,使用真空熔炼技术制备CoCrMo和CoCrMoW合金,采用SEM-EDS、TEM、XRD、压缩力学性能试验和腐蚀磨损试验研究2种合金的组织结构、力学和腐蚀摩擦学性能。结果表明:2种合金均由γ-Co和ε-Co组成,且微观组织以等轴晶为主。CoCrMo合金展现出优异的压缩力学性能,且其在小牛血清溶液中具有良好的耐腐蚀性,而CoCrMoW合金出现点蚀。2种合金在小牛血清溶液中具有较好的腐蚀摩擦学性能,其摩擦系数和磨损率分别为0.11~0.21和1.01×10^(-6)~2.46×10^(-6)mm^(3)/(N·m)。随着载荷和频率的增加,2种合金的摩擦系数降低,实时摩擦系数稳定性提高。在低载荷条件下,合金的耐腐蚀磨损性能随频率的增大而增强,其磨损机制以磨粒磨损为主;在高载荷条件下,合金的磨损率随频率的增加而增大,磨粒磨损和腐蚀磨损并存。总体而言,CoCrMo合金的耐腐蚀磨损性能优于CoCrMoW合金,这主要是因为CoCrMo合金具有较好的压缩力学性能和耐腐蚀性能。In order to clarify the corrosion friction behavior and corrosion wear resistance mechanism of CoCrMo and CoCrMoW alloys in calf serum solution,CoCrMo and CoCrMoW alloys were prepared using the vacuum melting technique,and the microstructure,mechanical and cor-rosion tribological properties of the two alloys were investigated by means of scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),transmission electron microscope(TEM),X-ray diffraction(XRD),compression mechanical performance experiments and corro-sion wear tests.Results showed that the two alloys were composed ofγ-Co andε-Co,and the microstructure was dominated by equiaxial crys-tals.CoCrMo alloy exhibited excellent compressive mechanical properties and good corrosion resistance in calf serum solution,while pitting cor-rosion occurred in the CoCrMoW alloy.The two alloys showed good corrosion tribological properties in calf serum solution,with friction coeffi-cients and wear rates of 0.11~0.21 and 1.01×10^(-6)~2.46×10^(-6)mm^(3)/(N·m),respectively.The friction coefficients of the two alloys de-creased with the increase in load and frequency,and the stability of real-time friction coefficients increased.At low loads,the corrosive wear resistance of the alloys increased with frequency,and their wear mechanisms were dominated by abrasive wear.At high loads,the wear rate of the alloys increased with frequency,and abrasive wear and corrosive wear coexisted.Overall,the corrosion wear resistance of CoCrMo alloy was better than that of CoCrMoW alloy,which was mainly due to the better compressive mechanical properties and corrosion resistance of CoCrMo alloys.

关 键 词：CoCrMo系合金 微观组织 力学性能 腐蚀摩擦学性能 腐蚀耐磨机制 

分 类 号：R318.08[医药卫生—生物医学工程]