工业气氛下电流场辅助Ni-ZrO_(2)陶瓷扩散焊  

Current Field-assisted Ni-ZrO_(2) Ceramic Diffusion Welding in Industrial Atmosphere

作　　者：张耀豪 谷岩 李雪松[2] 周杰 ZHANG Yaohao;GU Yan;LI Xuesong;ZHOU Jie(Department of Material Science and Engineering,Yangtze Normal University,Chongqing 408100,China;Department of Material Science and Engineering,Changchun University of Technology,Changchun 130000,China)

机构地区：[1]长江师范学院材料科学与工程学院,重庆408100 [2]长春工业大学材料科学与工程学院,长春130000

出　　处：《精密成形工程》2024年第2期149-156,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51605042);全国大学生创新创业训练计划(202210647001)。

摘　　要：目的研究电流驱动下金属Ni向ZrO_(2)陶瓷的定向扩散以及界面化学反应,实现两者在工业气氛下的快速连接。方法在1200℃下采用独特的电流场耦合扩散焊连接系统制备Ni-ZrO_(2)扩散偶样品。利用扫描电子显微镜(SEM)、能谱仪(EDS)对不同直流电参数(电流密度0~5.09 mA/mm^(2))下制备的样品界面焊缝形貌以及原子分布进行观察和解析;测试Ni-ZrO2扩散偶的剪切强度,并结合不同样品的界面微观结构演变初步揭示电流场辅助Ni-ZrO_(2)的连接机制。结果电流场有效地促进了工业气氛下金属-陶瓷界面的交互作用,当电子流由金属Ni指向ZrO_(2)陶瓷时,界面反应层厚度随着电流密度的增大而持续增大;样品接头的连接强度随着电流强度的增大呈先升高后降低的趋势,在1200℃下通电(电流密度为3.82 mA/mm^(2))5 min时得到最佳剪切强度164 MPa。结论施加直流电场引发的金属电迁移效应和固体电解质陶瓷中氧离子的定向运动是促进界面互扩散以及化学反应的重要原因,而局部的过度“失氧”容易导致陶瓷结构和功能特性丧失。与高真空环境相比,在工业气氛下界面附近较高的氧浓度抑制了陶瓷变质,使焊接接头在电流强度较大时仍然保持了较高的剪切强度。The work aims to study the directional diffusion of metal Ni to ZrO_(2) ceramics driven by electric current and the corresponding interface chemical reaction,and achieve the rapid connection of the two in an industrial atmosphere.The Ni-ZrO_(2) diffusion couple samples were prepared by a unique current field-coupled diffusion welding connection system at 1200℃.A scanning electron microscopy(SEM)and an energy spectroscopy(EDS)were used to observe and analyze the morphology and atomic distribution of sample interface welds prepared under different direct current parameters(current density 0-5.09 mA/mm^(2)).The shear strength of Ni-ZrO_(2) diffuser couple was tested,and the connection mechanism of current field assisted Ni-ZrO_(2) was preliminarily revealed by combining the evolution of the interface microstructure of different samples.The current field effectively promoted the interface interaction between metal and ceramic in industrial atmosphere,and when the electron flow pointed from metal Ni to ZrO_(2) ceramics,the thickness of the interface reaction layer continued to increase with the increase of current density.The connection strength of the sample connector showed a trend of first increasing and then decreasing with the increase of current intensity,and the optimal shear strength of 164 MPa was obtained when the power was applied to"3.82 mA/mm^(2),5 min"at 1200℃.The electromigration effect of metals caused by the application of direct current electric field and the directional movement of oxygen ions in solid electrolyte ceramics may be important reasons for promoting interfacial diffusion and chemical reactions,and local excessive"oxygen loss"are likely to cause the loss of ceramic structure and functional properties.Compared with the high vacuum environment,the higher oxygen concentration near the interface in the industrial atmosphere inhibits the deterioration of the ceramic,so that the welded joint still maintains high shear strength when the current intensity is large.

关 键 词：电流辅助扩散焊 工业气氛 镍/氧化锆陶瓷焊接 界面扩散 高剪切强度 

分 类 号：TB333[一般工业技术—材料科学与工程]