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Title: Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina

Abstract

A reactive air brazing (RAB) technique utilizing silver-copper oxide (Ag-CuO) alloys has previously been developed for joining ceramics components used in high temperature devices ranging from oxygen separation membranes, gas turbines and combustion engines. The application of the Ag-CuO system as a brazing material is limited by its solidus and liquidus temperatures, which are known to be in the range of 935 C and 967 C. Some joined ceramic components may be used in devices, which require further processing steps, or may be used in applications, that exceed these temperatures. It has been found that the addition of palladium to the silver copper oxide system will increase solidus and liquidus temperatures of the resulting alloy. In our work, we are studying the effects of palladium addition on the wetting properties of Ag-CuO braze system on alumina. Quality of brazing is evaluated through microstructural analysis and bending strength of brazed joints created with alumina. The presentation will include processing, and characterization of Ag-CuO brazed system with and without palladium addition on alumina.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
992024
Report Number(s):
PNNL-SA-41074
AA1510100; TRN: US201021%%464
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Surfaces, Interfaces, and the Science of Ceramic Joining: Proceedings of the 106th Annual Meeting of the American Ceramic Society. Ceramic Transactions, 158:173-182
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AIR; ALLOYS; BENDING; BRAZED JOINTS; BRAZING; CERAMICS; COMBUSTION; COPPER OXIDES; ENGINES; GAS TURBINES; MELTING; MEMBRANES; MICROSTRUCTURE; OXIDES; OXYGEN; PALLADIUM; PALLADIUM ADDITIONS; PROCESSING; SILVER; air brazing

Citation Formats

Darsell, Jens T, Hardy, John S, Kim, Jin Yong Y, and Weil, K Scott. Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina. United States: N. p., 2005. Web.
Darsell, Jens T, Hardy, John S, Kim, Jin Yong Y, & Weil, K Scott. Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina. United States.
Darsell, Jens T, Hardy, John S, Kim, Jin Yong Y, and Weil, K Scott. Sat . "Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina". United States.
@article{osti_992024,
title = {Microstructure, Melting and Wetting Properties of Pd-Ag-CuO Air Braze on Alumina},
author = {Darsell, Jens T and Hardy, John S and Kim, Jin Yong Y and Weil, K Scott},
abstractNote = {A reactive air brazing (RAB) technique utilizing silver-copper oxide (Ag-CuO) alloys has previously been developed for joining ceramics components used in high temperature devices ranging from oxygen separation membranes, gas turbines and combustion engines. The application of the Ag-CuO system as a brazing material is limited by its solidus and liquidus temperatures, which are known to be in the range of 935 C and 967 C. Some joined ceramic components may be used in devices, which require further processing steps, or may be used in applications, that exceed these temperatures. It has been found that the addition of palladium to the silver copper oxide system will increase solidus and liquidus temperatures of the resulting alloy. In our work, we are studying the effects of palladium addition on the wetting properties of Ag-CuO braze system on alumina. Quality of brazing is evaluated through microstructural analysis and bending strength of brazed joints created with alumina. The presentation will include processing, and characterization of Ag-CuO brazed system with and without palladium addition on alumina.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {3}
}

Conference:
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