Abstract
The quality of the high-tech ceramics largely depends on the quality of the starting powders. The high quality fine silicate powders of the A1203-SIO2, ZrO2-SiO2 and MgO-AI2 O3-SIO2 systems are prepared by the aqueous sol-gel technique. In this method tetraethoxysilane is used as the precursor for silica and metal formates are used as the precursors for the corresponding metal oxides. Here water is applied as a common solvent for the precursors instead of conventionally used alcohol. The detailed characterisation of the silicate powders from gels have been done by X-ray powder diffraction, TGA, DTA, scanning electron microscope, transmission electron microscope, BET surface area measurement and IR spectroscopic analysis. After calcination of ZrO2-SiO2 gels at 600, 900 and 1100~ the nanocrystalline tetragonal ZrO2 is formed and the crystalline size varies from approximately 7 to 19 rim. Mullite (3A1203-2SIO2) is formed only after one hour calcination of the precursor gel at 1200~ This simplified aqueous sol-gel technique is more cost effective and it takes less time for the preparation of gel.
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