Ecologically compatible water-based mullite sols, mullite...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 30/02 (2006.01) B01D 39/20 (2006.01) B01D 53/02 (2006.01) C04B 14/46 (2006.01) C04B 35/185 (2006.01) C04B 35/624 (2006.01) C04B 35/80 (2006.01) C04B 41/50 (2006.01)

Patent

CA 2236477

This invention relates to novel ecologically compatible water-based stable mullite precursor sols, mullite composites, and methods for making the same. The mullite precursor sols are synthesized using tetraethoxysilane and aluminum nitrate in water. The tetraethoxysilane is hydrolyzed with water and ammonium hydroxide catalyst to make a silica sol, which is then quenched with an aqueous solution of aluminum nitrate. The mullite precursor sols of the invention may be used to make highly densified ceramic composites.

Cette invention se rapporte à de nouveaux sols précurseurs de mullite, stables, à base aqueuse, compatibles du point de vue écologique, à des composites de mullite et à leurs procédés de fabrication. Les sols précurseurs de mullite sont synthétisés au moyen de tétraéthoxysilane et de nitrate d'aluminium dans l'eau. Le tétraéthoxysilane est hydrolysé avec de l'eau et un catalyseur d'hydroxyde d'ammonium pour obtenir un sol de silice qui est ensuite refroidi brusquement avec une solution aqueuse de nitrate d'aluminium. Les sols précurseurs de mullite de l'invention peuvent être utilisés pour obtenir des matériaux composites céramiques hautement densifiés.

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