退火对钛合金钽涂层力学及生物性能的影响  

Effect of Annealing on Mechanical and Biological Properties of Titanium Alloy Tantalum Coating

作　　者：廖士铸 张颂红[1] 宋振纶[2] 杨丽景[2] 杨驰[3] 郑吉驷[3] 周政印 LIAO Shizhu;ZHANG Songhong;SONG Zhenlun;YANG Lijing;YANG Chi;ZHENG Jisi;ZHOU Zhengyin(School of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Zhejiang Ningbo 315201,China;The Medical College's Affiliated Ninth People's Hospital,Shanghai Jiao Tong University,Shanghai 200011,China;The Chinese University of Hong Kong,Guangdong Shenzhen 518172,China)

机构地区：[1]浙江工业大学化学工程学院,杭州310014 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [3]上海交通大学医学院附属第九人民医院,上海200011 [4]香港中文大学,广东深圳518172

出　　处：《表面技术》2024年第2期184-192,共9页Surface Technology

基　　金：国家重点研发计划(2023YFC2509100,2019YFE0118600);上海市口腔医学重点实验室、上海交通大学医学院附属第九人民医院、上海交通大学口腔医学院研究项目(2022SKLS-KFKT006)。

摘　　要：目的 针对钛合金(TC4)在骨植入、骨替换方面因受体液腐蚀及骨骼之间的相互摩擦使改性涂层容易遭受破坏导致有毒金属离子的释放,通过退火提高TC4表面钽涂层的力学性能和生物相容性能。方法 采用磁控溅射技术在TC4基体上沉积钽涂层,并在不同的热处理温度650、750、850℃下退火5 h,使用扫描电子显微镜、能谱仪、XRD、划痕仪、摩擦磨损试验机、电化学工作站和生物毒性实验对Ta涂层的组织形貌、力学性能及生物性能进行测试与表征。结果 所制备的Ta涂层组织较致密,在一定的退火温度下,组织结构变得更加致密。在退火温度650℃时的硬度值(16.68 GPa)和弹性模量值(208.90 GPa)最高,这是由于产生较强的β-Ta峰,使硬度值显著提高。经750℃退火后,涂层具有最大的结合强度(20.82N),优异的耐腐蚀性,摩擦曲线波动最小、最平稳且平均摩擦系数值(COF)最小。这是由于涂层与基体之间的元素相互扩散,降低了界面应力,促进了结合强度的提高。这有利于提高涂层的致密度,可降低涂层表面的微孔缺陷,阻碍腐蚀溶液通过涂层的路径作用,从而提高基体的耐腐蚀性。同时有效避免了涂层大面积脱落,减少了摩擦表面积,也提高了涂层的摩擦性能。在750℃和850℃退火温度下钽涂层的KRGR>80%,表现出良好的生物相容性。结论 经退火后的钽涂层组织更加致密,结合强度更高,耐磨性、耐腐蚀性、生物相容性更好。The work aims to solve the problem that the modified coating of titanium alloy(TC4) is easily damaged due to the corrosion of body fluids and the friction between bones in bone implantation and replacement,which leads to the release of toxic metal ions,tissue and cell necrosis,thus causing the failure of implantation.The mechanical and biological properties of tantalum coating on the surface of TC4 can be improved by annealing process.In this study,TC4 titanium alloy with the size of ? 25 × 2 mm was selected as the matrix,which was ground to 2000# with sandpaper.Ta coating was deposited on the surface of TC4 matrix by magnetron sputtering technology,and annealed at different heat treatment temperature of 650,750 and 850 ℃ for 5 h.The cross section morphology,composition distribution,phase structure,bonding strength,wear resistance,corrosion resistance and biocompatibility of Ta coating were tested and characterized by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD) scratch instrument,multi-functional high temperature friction and wear testing machine,electrochemical workstation and biotoxicity test.The microstructure of the prepared Ta coating was relatively dense,and became denser at a certain annealing temperature without obvious micropores.The hardness value(16.68 GPa) and elastic modulus value(208.90 GPa) at the annealing temperature of 650 ℃ showed the highest performance,which was due to the generation of strong β-Ta peak,improving the hardness value significantly.After annealing at 750 ℃,the coating had the maximum bond strength(20.82 N),the excellent corrosion resistance,the smallest fluctuation of the friction curve,the most stability and the lowest average coefficient of friction(COF) value.This was due to the mutual diffusion of elements between the coating and the matrix,which reduced the interfacial stress and promoted the increase of bond strength.This was beneficial to improving the density of the coating,reducing the microporous defects on the c

关 键 词：TC4钛合金 磁控溅射 退火 结合强度 Ta涂层 生物相容性 

分 类 号：TG166.5[金属学及工艺—热处理] TB34[金属学及工艺—金属学]