Chapter 13. An Investigation of Interfacial Microstructure and Bonding in Brazed Silicon Nitride-Silicon Nitride and Silicon Nitride-Ne-Cr-Fe Alloy 600 Joints
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1989 The American Ceramic Society, Inc.
Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12
How to Cite
Hsu, S. C., Dunn, E. M., Ostreicher, K. and Emma, T. (1989) An Investigation of Interfacial Microstructure and Bonding in Brazed Silicon Nitride-Silicon Nitride and Silicon Nitride-Ne-Cr-Fe Alloy 600 Joints, in Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470312568.ch13
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1989
Print ISBN: 9780470374887
Online ISBN: 9780470312568
- metal brazes
Brazing is one of the most promising methods of ceramic-ceramic and ceramic- metal joining because of its relatively nonstringent joint tolerance requirements and because ductile brazes are able to accommodate thermal expansion mismatch. To implement this promising technology, a thorough understanding of interfacial microstructures must be developed.
A series of active metal brazes were made based on the silver-copper eutectic system with titanium additions. Foil and ribbon were made with a nominal composition of Ag-27.5 wt% Cu-2 wt% Ti. Paste was made by blending Ag-Cu eutectic powder with Ti powder and a binder.
Bond quality was evaluated by a variety of techniques, including optical metallography, microfocus x-ray radiography, and mechanical testing (modulus of rupture). Analytical electron microscopy revealed the presence of an apparently continuous layer of TiN at the interface between ceramic and braze. Interfacial phase formation is believed to play a key role in the bonding of ceramics to metals.