Joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO_(2) braze  

作　　者：Zhiquan Wang Chun Li Ragnar Kiebach Ilaria Ritucci Ming Chen Jian Cao 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [2]Department of Energy Conversion and Storage,Technical University of Denmark,Lyngby Campus,Anker Engelunds Vej,2800,Denmark

出　　处：《Journal of Materials Science & Technology》2022年第26期174-180,共7页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(nos.51805114,52005131,and U1737205)。

摘　　要：A novel Ag-SiO_(2) braze for Solid Oxide Cells was successfully developed and applied to join Co coated AISI 441 ferritic stainless steel to YSZ-NiO half cells.The braze showed an improved wettability on the coated steel and the YSZ compared to pure Ag.A defect-free steel/YSZ joint was obtained using an Ag-1SiO_(2) braze jointed at 1000℃for 30 min in air.The microstructure of the joints was characterized by scanning electron microscopy and transmission electron microscopy with energy-dispersive X-ray spectroscopy.Furthermore,a Co-Si-O_(2)phase diagram was calculated and used to explain the experimental results and formulate a reaction mechanism.It was found,that during the air brazing process,Co_(3)O_(4)and(Co,Fe)_(3)O_(4)are formed by the oxidation of the prefabricated Co coating.The growth of Cr_(2)O_(3)was effectively impeded by the formed Co-based spinels.In a second step,Co_(2)O_(3)reacts with the SiOpresent in braze.The CoSiOformed by the reaction ensures a firm bonding between the steel and Ag-SiObraze.

关 键 词：Co coated stainless steel YSZ-NiO half cell Microstructure Interfacial reaction Joining Ag-SiO_(2)braze Solid Oxide Cells 

分 类 号：TG42[金属学及工艺—焊接] TM911.4[电气工程—电力电子与电力传动]