Method for preparing a porous ceramic material with high...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 14/04 (2006.01) C04B 14/30 (2006.01) C04B 24/24 (2006.01) C04B 38/00 (2006.01) C04B 38/02 (2006.01)

Patent

CA 2642898

The present invention relates to a method for preparing a porous ceramic material, particularly for thermal insulation, comprising the steps of: providing a first composition in the form of a stable aqueous colloidal solution of silica and oxides of alkaline metals; providing a second stable composition in the form of a suspension in an organic liquid of inorganic and/or organic particles, the second composition containing compounds which, when the second composition is mixed with the first composition, can destabilize the first composition, forming gel, and can form an organic polymeric net together with a blowing agent; mixing the first composition and the second composition to form a mixture; forming from the mixture a porous structure in gel form, where an organic structure supports inorganic structures being formed; solidifying the porous structure in gel form, obtaining a porous ceramic material in which an organic polymeric net surrounds inorganic portions.

L'invention concerne un procédé de préparation d'une céramique poreuse destinée en particulier à une isolation thermique. Ce procédé comprend les étapes consistant à: fournir une première composition se présentant sous la forme d'une solution colloïdale aqueuse stable de silice et d'oxydes de métaux alcalins; fournir une seconde composition stable se présentant sous la forme d'une suspension contenue dans un liquide organique de particules inorganiques et/ou organiques, la seconde composition contenant des composés qui, lorsque la seconde composition est mélangée à la première composition, peuvent déstabiliser la première composition, former un gel, et peuvent former un réseau polymère organique à l'aide d'un agent d'expansion; mélanger la première composition et la seconde composition pour former un mélange; former, à partir de ce mélange, une structure poreuse se présentant sous forme de gel dans laquelle une structure organique sert de support aux structures inorganiques en cours de formation; solidifier la structure poreuse se présentant sous forme de gel pour obtenir une céramique poreuse dans laquelle les parties inorganiques sont entourées d'un réseau polymère organique.

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