An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An Ag-Al2TiO5 composite braze was developed and successfully tested as seal for solid oxide cells. The thermo-mechanical properties of the Ag-Al2TiO5 system and the chemical compatibility between this composite braze and relevant materials used in stacks were characterized and the leak rates as a function of the operation temperature were measured. The thermal expansion coefficient in the Ag-Al2TiO5 system can be tailored by varying the amount of the ceramic filler. The brazing process can be carried out in air, the joining partners showed a good chemical stability and sufficient low leak rates were demonstrated. Furthermore, the long-term stability of the Ag-Al2TiO5 composite braze was studied under relevant SOFC and SOEC conditions. The stability of brazed Crofer/Ag-Al2TiO5/NiO-YSZ assemblies in reducing atmosphere and in pure oxygen was investigated over 500 h at 850 °C. Additionally, a cell component test was performed to investigate the durability of the Ag-Al2TiO5 seal when exposed to dual atmosphere. The seals performed well over 900 h under electrolysis operation conditions (−0.5 A cm2, 850 °C), and no cell degradation related to the Ag-Al2TiO5 sealing was found, indicating that the developed braze system is applicable for the use in SOFC/SOEC stacks.
Original languageEnglish
JournalJournal of Power Sources
Volume315
Pages (from-to)339-350
Number of pages12
ISSN0378-7753
DOIs
Publication statusPublished - 2016

Keywords

  • Brazing
  • Sealant
  • Solid oxide fuel cell
  • Solid oxide electrolysis cell
  • Silver
  • Corrosion

Cite this

@article{b5aa2a783ba6411a94eb18860d370a0d,
title = "An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells",
abstract = "An Ag-Al2TiO5 composite braze was developed and successfully tested as seal for solid oxide cells. The thermo-mechanical properties of the Ag-Al2TiO5 system and the chemical compatibility between this composite braze and relevant materials used in stacks were characterized and the leak rates as a function of the operation temperature were measured. The thermal expansion coefficient in the Ag-Al2TiO5 system can be tailored by varying the amount of the ceramic filler. The brazing process can be carried out in air, the joining partners showed a good chemical stability and sufficient low leak rates were demonstrated. Furthermore, the long-term stability of the Ag-Al2TiO5 composite braze was studied under relevant SOFC and SOEC conditions. The stability of brazed Crofer/Ag-Al2TiO5/NiO-YSZ assemblies in reducing atmosphere and in pure oxygen was investigated over 500 h at 850 °C. Additionally, a cell component test was performed to investigate the durability of the Ag-Al2TiO5 seal when exposed to dual atmosphere. The seals performed well over 900 h under electrolysis operation conditions (−0.5 A cm2, 850 °C), and no cell degradation related to the Ag-Al2TiO5 sealing was found, indicating that the developed braze system is applicable for the use in SOFC/SOEC stacks.",
keywords = "Brazing, Sealant, Solid oxide fuel cell, Solid oxide electrolysis cell, Silver, Corrosion",
author = "Wolff-Ragnar Kiebach and Kurt Engelbrecht and Laila Grahl-Madsen and Bertil Sieborg and Ming Chen and Johan Hjelm and Kion Norrman and Christodoulos Chatzichristodoulou and Hendriksen, {Peter Vang}",
year = "2016",
doi = "10.1016/j.jpowsour.2016.03.030",
language = "English",
volume = "315",
pages = "339--350",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells. / Kiebach, Wolff-Ragnar; Engelbrecht, Kurt; Grahl-Madsen, Laila; Sieborg, Bertil; Chen, Ming; Hjelm, Johan; Norrman, Kion; Chatzichristodoulou, Christodoulos; Hendriksen, Peter Vang.

In: Journal of Power Sources, Vol. 315, 2016, p. 339-350.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells

AU - Kiebach, Wolff-Ragnar

AU - Engelbrecht, Kurt

AU - Grahl-Madsen, Laila

AU - Sieborg, Bertil

AU - Chen, Ming

AU - Hjelm, Johan

AU - Norrman, Kion

AU - Chatzichristodoulou, Christodoulos

AU - Hendriksen, Peter Vang

PY - 2016

Y1 - 2016

N2 - An Ag-Al2TiO5 composite braze was developed and successfully tested as seal for solid oxide cells. The thermo-mechanical properties of the Ag-Al2TiO5 system and the chemical compatibility between this composite braze and relevant materials used in stacks were characterized and the leak rates as a function of the operation temperature were measured. The thermal expansion coefficient in the Ag-Al2TiO5 system can be tailored by varying the amount of the ceramic filler. The brazing process can be carried out in air, the joining partners showed a good chemical stability and sufficient low leak rates were demonstrated. Furthermore, the long-term stability of the Ag-Al2TiO5 composite braze was studied under relevant SOFC and SOEC conditions. The stability of brazed Crofer/Ag-Al2TiO5/NiO-YSZ assemblies in reducing atmosphere and in pure oxygen was investigated over 500 h at 850 °C. Additionally, a cell component test was performed to investigate the durability of the Ag-Al2TiO5 seal when exposed to dual atmosphere. The seals performed well over 900 h under electrolysis operation conditions (−0.5 A cm2, 850 °C), and no cell degradation related to the Ag-Al2TiO5 sealing was found, indicating that the developed braze system is applicable for the use in SOFC/SOEC stacks.

AB - An Ag-Al2TiO5 composite braze was developed and successfully tested as seal for solid oxide cells. The thermo-mechanical properties of the Ag-Al2TiO5 system and the chemical compatibility between this composite braze and relevant materials used in stacks were characterized and the leak rates as a function of the operation temperature were measured. The thermal expansion coefficient in the Ag-Al2TiO5 system can be tailored by varying the amount of the ceramic filler. The brazing process can be carried out in air, the joining partners showed a good chemical stability and sufficient low leak rates were demonstrated. Furthermore, the long-term stability of the Ag-Al2TiO5 composite braze was studied under relevant SOFC and SOEC conditions. The stability of brazed Crofer/Ag-Al2TiO5/NiO-YSZ assemblies in reducing atmosphere and in pure oxygen was investigated over 500 h at 850 °C. Additionally, a cell component test was performed to investigate the durability of the Ag-Al2TiO5 seal when exposed to dual atmosphere. The seals performed well over 900 h under electrolysis operation conditions (−0.5 A cm2, 850 °C), and no cell degradation related to the Ag-Al2TiO5 sealing was found, indicating that the developed braze system is applicable for the use in SOFC/SOEC stacks.

KW - Brazing

KW - Sealant

KW - Solid oxide fuel cell

KW - Solid oxide electrolysis cell

KW - Silver

KW - Corrosion

U2 - 10.1016/j.jpowsour.2016.03.030

DO - 10.1016/j.jpowsour.2016.03.030

M3 - Journal article

VL - 315

SP - 339

EP - 350

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -