Two commercial ceramic-to-metal braze alloys, Nioro ABA and Gold ABA, were exposure tested in high-temperature air to evaluate their oxidation behavior, microstructural stability, and materials compatibility for potential application in sealing the ceramic and metal components of a solid-state oxygen separation device. Oxidation studies were conducted on the as-received braze alloy foils, on wetting samples prepared using yttria-stabilized zirconia (YSZ) and stainless steel substrates, and on brazed YSZ/stainless steel joints. It was found that the introduction of the YSZ and/or the stainless steel can significantly modify the inherent oxidation characteristics of these brazes due to accelerated oxygen transport along the braze/ceramic interface and/or diffusion of oxidizable species from the metal substrate into the braze during joining and subsequent segregation and oxidation of these species at the braze/ceramic interface.
Revised: October 25, 2007 |
Published: December 31, 2004
Citation
Weil K.S., and J.P. Rice. 2004.The Influence of Ceramic and Metallic Substrates on the Oxidation Behavior of Gold ABA. In Joining of Advanced and Specialty Materials VI - Proceedings from Materials Solutions 2003 on Joining of Advanced and Specialty Materials, 76-84. Materials Park, Ohio:ASM International.PNNL-SA-39698.