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

Conference · Sat Mar 19 04:00:00 EST 2005

OSTI ID:992024

Darsell, Jens T; Hardy, John S; Kim, Jin Yong Y; Weil, K Scott

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 992024
• Report Number(s): PNNL-SA-41074; AA1510100
• Country of Publication: United States
• Language: English

Related Subjects

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