Gas evolution from advanced ceramics during fracture under ultra high vacuum

S. Kitaoka, H. Matsubara, H. Kawamoto, H. Yanagida, M. Matsumoto, M. Kanno

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume18
Issue number4 B
Publication statusPublished - 1997 Jan 1
EventProceedings of the 1997 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures-B - Cocoa, FL, USA
Duration: 1997 Jan 121997 Jan 16

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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