Chapter 5. Material Transport Mechanisms During the Diffusion Bonding of Niobium to A12O3

  1. John B. Wachtman Jr.
  1. K. Burger and
  2. M. Rühle

Published Online: 26 MAR 2008

DOI: 10.1002/9780470312568.ch5

Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12

Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12

How to Cite

Burger, K. and Rühle, M. (1989) Material Transport Mechanisms During the Diffusion Bonding of Niobium to A12O3, 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.ch5

Author Information

  1. Max-Planck-Institut für Metallforschung Institut für Werkstoffwissenschaften 7000 Stuttgart 1 West Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374887

Online ISBN: 9780470312568

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Keywords:

  • phenomena;
  • mechanisms;
  • niobium surface;
  • dimensions;
  • composite

Summary

Many different material transport phenomena may occur during the diffusion-bonding process of a metal to a ceramic at high temperatures. The operating transport mechanisms depend on the selected combination of materials as well as on the bonding conditions. Systematic studies at the Nb/Al2O3 interface allow an identification of the dominating mechanisms. Experiments were performed where different structures in the niobium surface were bonded to a polished alumina surface. The niobium sample either has a very flat polished surface or well-defined defects of different dimensions and shapes were induced into the surface. It can be shown that chemical reactions dominate the material transport under the conditions selected for these experiments.