Quality Evaluation of Diffusion Bonded Joints by Electrical Resistance Measuring and Microscopic Fatigue Testing

作     者：LI Yujia XUAN Fuzhen LI Shuxin TU Shandong 

作者机构：Key Laboratory of Pressure System and Safety of Ministry of Education East China University of Science and Technology Shanghai 20023 7 China School of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2011年第24卷第2期

页      面：187-194页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by National Natural Science Foundation of China(Grant No.50475068) 

主　　题：diffusion bonded joints interfacial failure electrical resistance microscopic fatigue testing 

摘      要：Micro-structure related behavior of diffusion bonding joints is a crucial issue in device and reactor fabrication of Micro Chemo Mechanical ***,the previous studies have been focused on the macro mechanical performance of diffusion bonded joint,especially diffusion bonding conditions effects on tensile strength,shearing strength and fatigue *** research of interfacial micro-voids and microstructures evolution for failure mechanism has not been carried out for diffusion-bonded *** interfacial electrical resistance measuring method is proposed to evaluate the quality of bonded joints and verified by using two-dimensional finite-element *** influences of micro void geometry on increments of resistance are analyzed and the relationship between bonded area fraction and resistance increment is established by theoretical analysis combined with simulated *** inspections and micro-hardness testing are conducted near the interface of diffusion bonded *** the purpose of identifying the failure mechanisms of the joints,both microscopic tensile and fatigue tests are conducted on the self-developed in-situ microscopic fatigue testing *** on the microscopic observations,the mechanism of interfacial failure is *** observation result shows that for 316LSS diffusion-bonded joints,microstructure evolution and effect of micro-voids play a key role in interfacial failure ***,a new life prediction model in terms of the increment of electrical resistance is developed and confirmed by the experimental *** proposed study is initiated that constituted a primary interfacial failure mechanism on micron scale and provide the life prediction for reliability of components sealed by diffusion bonding.