ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 32, Number 3
JKCSEZ 32(3)
June 20, 1988 

Fine powders of amorphous Al2O3, SiO2, Al2O3-SiO2 system were prepared by hydrolysis of solutions containing alkoxides, aluminium tri-isopropoxide and silicon tetra-ethoxide. High purity ultrafine β-sialon powders were prepared by the carbothermal reduction-nitridation of amorphous Al2O3-SiO2 powders mixed with carbon black as a reducing agent. In the hydrolysis step the effect of the factors such as pH, reaction temperature and amount of water on the conversion rate of alkoxides to oxides was investigated. In the carbothermal reduction-nitridation the reaction path was assumed by the analysis of intermediates formed in the process of β-sialon synthesis and the reaction kinetics of β-sialon formation was considered.