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Synthesis of β-SiAlON: A combined method using sol–gel and SHS processes

Authors
Journal
Ceramics International
0272-8842
Publisher
Elsevier
Publication Date
Volume
34
Issue
5
Identifiers
DOI: 10.1016/j.ceramint.2007.02.017
Keywords
  • β-Sialon
  • Shs
  • Mechanism Of Formation
  • High Pressure
  • Ceramic Nitrides

Abstract

Abstract β-SiAlON has been prepared by a SHS reaction performed under high nitrogen pressure on a compacted mixture of silicon and mullite. In order to optimise this reaction, the solid mixture was prepared from a liquid solution in which the mullite (2SiO 2-3Al 2O 3) was formed by a sol–gel process. The SHS samples were characterized by using Scanning Electron Microscopy (SEM) and X-ray diffraction. A Rietveld refinement performed on the recorded diffractograms revealed a very high formation rate of β-SiAlON (more than 80 wt%) when the reaction was carried out under low nitrogen pressure. From the whole of our results, a mechanism of β-SiAlON formation has been suggested.

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