Joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO2 braze

Zhiquan Wang; Chun Li; Ragnar Kiebach; Ilaria Ritucci; Ming Chen; Jian Cao

doi:10.1016/j.jmst.2022.01.009

Joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO₂ braze

Zhiquan Wang, Chun Li, Ragnar Kiebach, Ilaria Ritucci, Ming Chen, Jian Cao^*

^*Corresponding author for this work

Department of Energy Conversion and Storage

Harbin Institute of Technology

Research output: Contribution to journal › Journal article › Research › peer-review

22 Downloads (Pure)

Abstract

A novel Ag-SiO₂ 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-1SiO₂ braze jointed at 1000 °C 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-O₂ 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, Co₃O₄ and (Co, Fe)₃O₄ are formed by the oxidation of the prefabricated Co coating. The growth of Cr₂O₃ was effectively impeded by the formed Co-based spinesl. In a second step, Co₃O₄ reacts with the SiO₂ present in braze. The Co₂SiO₄ formed by the reaction ensures a firm bonding between the steel and Ag-SiO₂ braze.

Original language	English
Journal	Journal of Materials Science and Technology
Volume	121
Pages (from-to)	174-180
Number of pages	7
ISSN	1005-0302
DOIs	https://doi.org/10.1016/j.jmst.2022.01.009
Publication status	Published - 2022

Keywords

Co coated stainless steel
YSZ-NiO half cell
Microstructure
Interfacial reaction
Joining
Ag-SiO2 braze
Solid oxide cells

Access to Document

10.1016/j.jmst.2022.01.009

FulltextAccepted author manuscript, 1.52 MBLicence: CC BY-NC-ND

OpenUrl availability

Full text

Cite this

@article{c940b491aefd4a908dd9eda99c912dcd,

title = "Joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO2 braze",

abstract = "A novel Ag-SiO2 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-1SiO2 braze jointed at 1000 °C 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-O2 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, Co3O4 and (Co, Fe)3O4 are formed by the oxidation of the prefabricated Co coating. The growth of Cr2O3 was effectively impeded by the formed Co-based spinesl. In a second step, Co3O4 reacts with the SiO2 present in braze. The Co2SiO4 formed by the reaction ensures a firm bonding between the steel and Ag-SiO2 braze.",

keywords = "Co coated stainless steel, YSZ-NiO half cell, Microstructure, Interfacial reaction, Joining, Ag-SiO2 braze, Solid oxide cells",

author = "Zhiquan Wang and Chun Li and Ragnar Kiebach and Ilaria Ritucci and Ming Chen and Jian Cao",

year = "2022",

doi = "10.1016/j.jmst.2022.01.009",

language = "English",

volume = "121",

pages = "174--180",

journal = "Journal of Materials Science and Technology",

issn = "1005-0302",

publisher = "Zhongguo Kexueyuan Jinshu Yanjiusuo",

}

TY - JOUR

T1 - Joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO2 braze

AU - Wang, Zhiquan

AU - Li, Chun

AU - Kiebach, Ragnar

AU - Ritucci, Ilaria

AU - Chen, Ming

AU - Cao, Jian

PY - 2022

Y1 - 2022

N2 - A novel Ag-SiO2 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-1SiO2 braze jointed at 1000 °C 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-O2 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, Co3O4 and (Co, Fe)3O4 are formed by the oxidation of the prefabricated Co coating. The growth of Cr2O3 was effectively impeded by the formed Co-based spinesl. In a second step, Co3O4 reacts with the SiO2 present in braze. The Co2SiO4 formed by the reaction ensures a firm bonding between the steel and Ag-SiO2 braze.

AB - A novel Ag-SiO2 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-1SiO2 braze jointed at 1000 °C 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-O2 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, Co3O4 and (Co, Fe)3O4 are formed by the oxidation of the prefabricated Co coating. The growth of Cr2O3 was effectively impeded by the formed Co-based spinesl. In a second step, Co3O4 reacts with the SiO2 present in braze. The Co2SiO4 formed by the reaction ensures a firm bonding between the steel and Ag-SiO2 braze.

KW - Co coated stainless steel

KW - YSZ-NiO half cell

KW - Microstructure

KW - Interfacial reaction

KW - Joining

KW - Ag-SiO2 braze

KW - Solid oxide cells

U2 - 10.1016/j.jmst.2022.01.009

DO - 10.1016/j.jmst.2022.01.009

M3 - Journal article

SN - 1005-0302

VL - 121

SP - 174

EP - 180

JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

ER -