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Hot pressing and α-β′ phase transformation of compositions corresponding to β′-sialons

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Abstract

The reaction hot pressing at 1750°C of compositions corresponding to pure β′-sialons, Si6−zAlzOzN8−z with z-values 1.0 to 2.0, has been studied. The liquid phase, present in the system at the beginning of the process, was found to disappear completely during the heating-up period of the hot-pressing run. During the presence of transient liquid the particle rearrangement process was the main densification mechanism. After reaching the hot-pressing temperature and removal of the liquid phase, the grain-boundary sliding is thought to be the densification mechanism and phase transformation is probably controlled by vapour transport.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, 842 36, Bratislava, Czechoslovakia

    Miroslav Haviar

  2. Laboratory of Applied Physics I, Technical University of Denmark, 2800, Lyngby, Denmark

    Poul Lenvig Hansen

Authors
  1. Miroslav Haviar
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  2. Poul Lenvig Hansen
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Haviar, M., Hansen, P.L. Hot pressing and α-β′ phase transformation of compositions corresponding to β′-sialons. J Mater Sci 25, 992–996 (1990). https://doi.org/10.1007/BF03372192

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  • DOI: https://doi.org/10.1007/BF03372192

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