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Title: JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS

Abstract

Various compositions in the Ag-CuOx system are being investigated as potential filler metals for use in air brazing high-temperature electrochemical devices such as solid oxide fuel cells and gas concentrators. Prior work has shown that the melting temperature, and therefore the potential operational temperature, of these materials can be increased by alloying with palladium. The current study examines the effects of palladium addition on the joint strength of specimens prepared from yttria stabilized zirconia (YSZ) bars brazed with three different families of filler metals: Ag-CuO, 5Pd-Ag-CuO, and 15Pd-Ag-CuO. In general it was found that palladium leads to a small-to-moderate decrease in joint strength, particularly in low copper oxide compositions filler metals. However the effect is likely acceptable if a higher temperature air braze filler metal is desired. In addition, a composition was found for each filler metal series in which the joint failure mechanism undergoes a transition, typically from ductile to brittle failure. In each case, this composition corresponds approximately to the silver-rich boundary composition of the liquid miscibility gap in each system at the temperature of brazing.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1240236
Report Number(s):
PNNL-SA-67223
AA6010000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the 23rd Annual Conference on Fossil Energy Materials, May 12-14, 2009, Pittsburgh, Pennsylvania
Country of Publication:
United States
Language:
English
Subject:
air brazing; ceramic joining; separation membranes

Citation Formats

Weil, K. Scott, and Darsell, Jens T. JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS. United States: N. p., 2009. Web.
Weil, K. Scott, & Darsell, Jens T. JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS. United States.
Weil, K. Scott, and Darsell, Jens T. Thu . "JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS". United States.
@article{osti_1240236,
title = {JOINING OF ADVANCED HIGH-TEMPERATURE MATERIALS},
author = {Weil, K. Scott and Darsell, Jens T.},
abstractNote = {Various compositions in the Ag-CuOx system are being investigated as potential filler metals for use in air brazing high-temperature electrochemical devices such as solid oxide fuel cells and gas concentrators. Prior work has shown that the melting temperature, and therefore the potential operational temperature, of these materials can be increased by alloying with palladium. The current study examines the effects of palladium addition on the joint strength of specimens prepared from yttria stabilized zirconia (YSZ) bars brazed with three different families of filler metals: Ag-CuO, 5Pd-Ag-CuO, and 15Pd-Ag-CuO. In general it was found that palladium leads to a small-to-moderate decrease in joint strength, particularly in low copper oxide compositions filler metals. However the effect is likely acceptable if a higher temperature air braze filler metal is desired. In addition, a composition was found for each filler metal series in which the joint failure mechanism undergoes a transition, typically from ductile to brittle failure. In each case, this composition corresponds approximately to the silver-rich boundary composition of the liquid miscibility gap in each system at the temperature of brazing.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {5}
}

Conference:
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