钛合金TC4表面医用氧化物陶瓷涂层的残余热应力分析  

Analysis of Residual Thermal Stress of Medical Oxide Ceramic Coating on TC4 Titanium Alloy

作　　者：丁一帆 单湘衡 袁乾鸿 王皓 汤迎红[1] 丁泽良[1] DING Yifan;SHAN Xiangheng;YUAN Qianhong;WANG Hao;TANG Yinghong;DING Zeliang(College of Mechanical Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412007

出　　处：《包装学报》2022年第1期32-39,共8页Packaging Journal

基　　金：湖南省自然科学基金资助项目(2019JJ60059,2020JJ6079);湖南省教育厅科学研究基金资助项目(20A159)。

摘　　要：采用有限元方法分析了钛合金TC4表面分别溅射沉积的4种医用陶瓷涂层Ta_(2)O_(5)、Nb_(2)O_(5)、ZrO_(2)和TiO_(2)的残余热应力分布情况,并以Ta_(2)O_(5)涂层为例,研究涂层的厚度与结构对残余热应力最大值的影响。结果表明,4种氧化物涂层的残余热应力都表现为拉应力,且应力最大值均位于涂层/基体结合界面的外边缘,其中残余热应力最大值最大的是Ta_(2)O_(5)涂层(32.2 MPa),其次是Nb_(2)O_(5)(19.7 MPa)和ZrO_(2)涂层(10.2 MPa),最小是TiO_(2)涂层(1.03 MPa)。当涂层厚度由1μm增加到4μm时,Ta_(2)O_(5)涂层的残余热应力最大值呈现先减小后增大的变化趋势,其中涂层厚度为2.5μm时的残余应力最大值最小。对于不同结构的Ta_(2)O_(5)涂层来说,在表面层厚度或涂层总厚度相同的情况下,残余热应力最大值由小到大的涂层结构依次为梯度涂层、复合涂层、单层涂层。The residual thermal stress distribution characteristics of Ta_(2)O_(5),Nb_(2)O_(5),ZrO_(2),and TiO_(2) medical oxide ceramic coatings on TC4 titanium alloy were analyzed via the finite element method,and the influence of coating thickness and structure on the maximum residual thermal stress value of Ta_(2)O_(5) layer was investigated.The results show that the residual thermal stress in the four oxide coatings is tensile,and the maximum stress value is located at the outer edge of the coating/substrate interface.Among them,Ta_(2)O_(5) coating has the highest maximum residual thermal stress value(32.2 MPa),followed by Nb_(2)O_(5) coating(19.7 MPa)and ZrO_(2) coating(10.2 MPa),and then TiO_(2) coating(1.03 MPa).When the coating thickness increases from 1μm to 4μm,the maximum residual thermal stress value of Ta_(2)O_(5) coating decreases first and then increases.Ta_(2)O_(5) layer with 2.5μm thickness shows the smallest maximum residual stress value.For Ta_(2)O_(5) coatings with different structures,the maximum residual thermal stress value in ascending order is gradient coating,composite coating,single-layer coating.

关 键 词：钛合金 氧化物涂层 有限元分析 残余热应力 

分 类 号：TG174.4[金属学及工艺—金属表面处理]