A silver-based joining technique referred to as reactive air brazing (RAB) has been recently developed for joining high temperature structural ceramic components of the type used in gas turbines, combustion engines, heat exchangers, and burners. It was found that additions of CuO to silver have a significant effect on the wettability and joint strength characteristics of the resulting braze on polycrystalline alumina substrates. More recently, it has been found that by adding as little as 0.5 mol% titania to these Ag-CuO brazes, the wettability of the RAB on alumina surfaces is further enhanced. The results of wettabilty measurements of Ag-CuO-TiO2 RAB compositions on alumina will be presented along with the microstructural characterization of Ag-CuO-TiO2 braze joints in alumina.
Revised: August 13, 2010 |
Published: April 6, 2004
Citation
Darsell J.T., J.S. Hardy, J.Y. Kim, and K.S. Weil. 2004.AN INVESTIGATION OF WETTABILITY, AND MICROSTRUCTURE IN ALUMINA JOINTS BRAZED WITH Ag-CuO-TiO2. In Ceramic Transactions: Surfaces, Interfaces, and the Science of Ceramic Joining: Proceedings of the 106th Annual Meeting of the American Ceramic Society, edited by KS Weil, IE Reimanis and CA Lewinsohn, 158, 65-72. Westerville, Ohio:American Ceramic Society.PNNL-SA-41236.