Chapter 23. Gas Evolution from Advanced Ceramics During Fracture Under Ultra High Vacuum

  1. J. P. Singh
  1. S. Kitaoka1,
  2. H. Matsubara1,
  3. H. Kawamoto1,
  4. H. Yanagida1,
  5. M. Matsumoto2 and
  6. M. Kanno2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch23

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Kitaoka, S., Matsubara, H., Kawamoto, H., Yanagida, H., Matsumoto, M. and Kanno, M. (1997) Gas Evolution from Advanced Ceramics During Fracture Under Ultra High Vacuum, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch23

Author Information

  1. 1

    Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya, 456 JAPAN

  2. 2

    Department of Materials Science, Faculty of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113 JAPAN

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • polycrystalline;
  • evolution;
  • intermetallic;
  • microstructural;
  • simultaneously

Summary

The commercial Al2O3, SiC and Si3N4 ceramics were fractured under ultra high vacuum, and the gases evolved during fracture were analyzed by quadrupole mass spectroscopy. Various gases were detected accompanying the fracture event of all the ceramics. The relative emission peak intensities of the gases and the corresponding total pressure change in the chamber depended on the processing conditions of the ceramics. A large amount of N2 was released from the polycrystalline Al2O3 compared with the single crystal, but hardly detection of O2 in spite of the sintering in air. This may be explained by the outward diffusiveness of the gases entrapped in residual pores formed during the sintering. In the fracture of the SiC, the Ar was released in quantity from the pores formed during the sintering in Ar. A great deal of H2 evolution for the Si3N4 may be produced mainly by chemical reactions accompanying the processing. This analysis is expected to be applied for fundamental studies on processing and fracture of advanced ceramics.