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

2007; Elsevier BV; Volume: 34; Issue: 5 Linguagem: Inglês

10.1016/j.ceramint.2007.02.017

1873-3956

Nicolas Pradeilles, Marie‐Christine Record, Dominique Granier, R.M. Marin-Ayral,

Boron and Carbon Nanomaterials Research

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 (2SiO2-3Al2O3) 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.