Abstract
Reaction processes which form β-sialon by reaction between SiO 2 and Al in an N 2 atmosphere up to 1440°C were studied by means of DTA and X-ray diffraction techniques. Stoichiometric mixtures of Al and SiO 2 powders, for the oxidation-reduction reaction 4Al + 3SiO 2 → 3Si + 2Al 2O 3, and mixtures containing 50% Al in excess were used. With the stoichiometric mixture, as well as β'-sialon, the X sialon phase and mullite were formed as minor constituents. In contrast, the mixture containing Al in excess produced as secondary phase a 15R sialon phase or “Y” phase. The addition of Al in excess made it possible to obtain a product enriched in β'-sialon.
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