POWDERY OXIDE OF SILICON-ALUMINUM MIXTURE OBTAINED BY FLAME HYDROLYSIS, PRODUCTION THEREOF AND PRODUCTION OF CERAMIC AND CERAMIC PRECURSOR

摘要

Silicon-aluminum mixed oxide powder which is flame-hydrolytically produced and has a composition of 65 to 85% by weight Al2O3, remainder SiO2 and an amorphous structure, in which each primary particle contains components of SiO2 and of Al2O3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m2/g. The powder is used for the production of mullite and sintered compacts manufactured from it.