skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Joining Mixed Conducting Oxides Using an Air-Fired Electrically Conductive Braze

Abstract

Due to their mixed oxygen ion and electron conducting properties, ceramics such as lanthanum strontium cobalt ferrites (LSCF) are attractive materials for use in active electrochemical devices such as solid oxide fuel cells (SOFC) and oxygen separation membranes. However, to take full advantage of the unique properties of these materials, reliable joining techniques need to be developed. If such a joining technique yields a ceramic-to-metal junction that is also electrically conductive, the hermetic seals in the device could provide the added function of either drawing current from the mixed conducting oxide, in the case of SOFC applications, or carrying it to the oxide to initate ionic conduction, in the case of oxygen separation and electrocatalysis applications. This would greatly reduce the need for complex interconnect design, thereby simplifying one of the major challenges faced in SOFC development. A process referred to as reactive air brazing (RAB) has been developed in which firing a Ag-CuO filler material in air creates a functional ceramic-to-metal junction, in which the silver-based matrix of the braze affords both metallic ductility and conductivity in the joint. Investigating a range of Ag-CuO alloy combinations determined that compositions containing between 1.4 and 16 mol% CuO appear to offermore » the best combination of wettability, joint strength, and electrical conductivity.« less

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15010715
Report Number(s):
PNNL-SA-39840
Journal ID: ISSN 0013-4651; JESOAN; AA1510100; TRN: US200501%%192
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society, 151(8):J48-J49
Additional Journal Information:
Journal Volume: 151; Journal Issue: 8; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ALLOYS; BRAZING; CERAMICS; COBALT; DUCTILITY; ELECTRIC CONDUCTIVITY; ELECTRONS; FERRITES; FILLERS; FUNCTIONALS; LANTHANUM; MEMBRANES; OXIDES; OXYGEN; OXYGEN IONS; SOLID OXIDE FUEL CELLS; STRONTIUM; WETTABILITY

Citation Formats

Hardy, John S, Kim, Jin Yong Y, and Weil, K Scott. Joining Mixed Conducting Oxides Using an Air-Fired Electrically Conductive Braze. United States: N. p., 2004. Web. doi:10.1149/1.1764782.
Hardy, John S, Kim, Jin Yong Y, & Weil, K Scott. Joining Mixed Conducting Oxides Using an Air-Fired Electrically Conductive Braze. United States. doi:10.1149/1.1764782.
Hardy, John S, Kim, Jin Yong Y, and Weil, K Scott. Fri . "Joining Mixed Conducting Oxides Using an Air-Fired Electrically Conductive Braze". United States. doi:10.1149/1.1764782.
@article{osti_15010715,
title = {Joining Mixed Conducting Oxides Using an Air-Fired Electrically Conductive Braze},
author = {Hardy, John S and Kim, Jin Yong Y and Weil, K Scott},
abstractNote = {Due to their mixed oxygen ion and electron conducting properties, ceramics such as lanthanum strontium cobalt ferrites (LSCF) are attractive materials for use in active electrochemical devices such as solid oxide fuel cells (SOFC) and oxygen separation membranes. However, to take full advantage of the unique properties of these materials, reliable joining techniques need to be developed. If such a joining technique yields a ceramic-to-metal junction that is also electrically conductive, the hermetic seals in the device could provide the added function of either drawing current from the mixed conducting oxide, in the case of SOFC applications, or carrying it to the oxide to initate ionic conduction, in the case of oxygen separation and electrocatalysis applications. This would greatly reduce the need for complex interconnect design, thereby simplifying one of the major challenges faced in SOFC development. A process referred to as reactive air brazing (RAB) has been developed in which firing a Ag-CuO filler material in air creates a functional ceramic-to-metal junction, in which the silver-based matrix of the braze affords both metallic ductility and conductivity in the joint. Investigating a range of Ag-CuO alloy combinations determined that compositions containing between 1.4 and 16 mol% CuO appear to offer the best combination of wettability, joint strength, and electrical conductivity.},
doi = {10.1149/1.1764782},
journal = {Journal of the Electrochemical Society, 151(8):J48-J49},
issn = {0013-4651},
number = 8,
volume = 151,
place = {United States},
year = {2004},
month = {10}
}