PNNL

Abstract

A new ceramic brazing technique referred to as reactive air brazing (RAB) is currently under development that has potential applications in high temperature devices such as gas concentrators, solid oxide fuel cells, gas turbines, and combustion engines. Currently, the technique utilizes a silver-copper oxide system. We have previously increased the operating temperature of this system by adding palladium. In this paper, we report the effects of palladium addition on the wetting properties of the resulting braze relative to alumina. Specifically, we will discuss the apparent correlation between braze wettability and interfacial microstructure between the braze and alumina, both with and without palladium additions.