摘要
选用纳米Al2O3颗粒作为增强相,成功开发了Ag-CuO-Al2O3复合钎料,并将其应用于空气反应钎焊固体氧化物燃料电池(SOFC)组件.对复合钎料的空气反应钎焊工艺进行研究,在1050℃/30 min工艺条件下实现了SOFC电池片与铝化不锈钢连接体的无缺陷连接,分析了接头两侧界面连接特征以及纳米Al2O3增强相在连接过程中的演化行为.对焊后接头进行高温服役性能测试,探究了接头组织和性能在高温氧化(空气)和还原(H2-50H2O-N2)气氛中的演化规律.结果表明,铝化不锈钢的Al2O3保护层对不锈钢基体起到了良好的保护作用,避免了不锈钢基体在连接以及高温服役过程中的性能衰减,在确保接头组织稳定性中发挥了关键作用.系统分析了高温服役过程对接头气密性的影响,综合评定了Ag-CuO-Al2O3复合钎料空气反应钎焊SOFC组件的适用性.
In this study,the Ag-CuO-Al2O3 composite braze was successfully developed through adding Al2O3 nanoparticle reinforcements,which was suitable for reactive air brazing(RAB)solid oxide fuel cell(SOFC)components.The RAB joining process was investigated in detail.The cell was successfully joined to the aluminized steel at 1050℃for30 min.The interfacial joining properties were studied.The evolution behavior of Al2O3 nanoparticle reinforcements in the RAB process was also analyzed.As-brazed joints were tested in high-temperature service atmospheres.The microstructure properties of joints after aging in high-temperature oxidization(air)and reduction(H2-50 H2 O-N2)atmospheres was investigated.It is shown that the Al2O3 protective layer of aluminized steel had good protective effects on the steel matrix,avoiding its performance degradation during brazing and hightemperature aging.The Al2O3 protective layer play a key role in ensuring the stability of joint structure.The influence of the high-temperature service on the gas-tightness of joints was systematically studied.The applicability of the Ag-CuO-Al2O3 composite braze used for RAB joining SOFC components was comprehensively evaluated.
作者
司晓庆
李淳
郑庆伟
亓钧雷
冯吉才
曹健
SI Xiaoqing;LI Chun;ZHENG Qingwei;QI Junlei;Feng Jicai;CAO Jian(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2020年第5期1-6,I0001,共7页
Transactions of The China Welding Institution
基金
国家自然科学基金航天联合基金资助项目(U1737205)
中国博士后科学基金资助项目(2019TQ0075)
黑龙江省博士后科学基金资助项目(LBH-Z19142)。
关键词
固体氧化物燃料电池
空气反应钎焊
界面组织
高温服役
solid oxide fuel cell
reactive air brazing
interfacial microstructure
high-temperature service
作者简介
第一作者:司晓庆,1989年出生,博士,讲师,主要从事空气反应钎焊及能源器件封接方面的科研工作,发表论文10余篇,Email:sixq@hit.edu.cn;通信作者:曹健,博士,教授,博士研究生导师,国家优秀青年科学基金获得者,“万人计划”青年拔尖人才,Email:cao_jian@hit.edu.cn.
