Ceramic materials fabricated from hydridosiloxane-based...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/58 (2006.01) C04B 35/16 (2006.01) C04B 35/185 (2006.01) C04B 35/571 (2006.01) C04B 35/589 (2006.01) C04B 35/634 (2006.01) C04B 41/45 (2006.01) C08G 77/38 (2006.01) C08G 77/398 (2006.01) C08G 77/54 (2006.01) C08G 79/00 (2006.01)

Patent

CA 2189985

A method is provided for preparing ceramic precursors from hydridosiloxane starting materials and then pyrolyzing these precursors to give rise to silicious ceramic materials. Si-H bonds present in the hydridosiloxane starting materials are catalytically activated, and the activated hydrogen atoms may then be replaced with nonhydrogen substituents. These preceramic materials are pyrolyzed in a selected atmosphere to give the desired ceramic product. Ceramic products which may be prepared by this technique include silica, silicon oxynitride silicon carbide, metal silicates, and mullite.

Procédé de préparation de précurseurs céramiques à partir de matériaux de départ à base d'hydridosiloxane, et de pyrolyse de ces précurseurs pour produire des matières céramiques siliciées. Des liaisons Si-H présentes dans lesdits matériaux de départ à base d'hydridosiloxane sont soumises à une activation catalytique, après quoi les atomes d'hydrogène activés peuvent être remplacés par des substituants non hydrogène. Ces matériaux précurseurs céramiques sont pyrolysés en atmosphère régulée pour former le produit céramique requis. Les produits céramiques pouvant être préparés selon cette technique comprennent la silice, l'oxynitrure de silicium, le carbure de silicium, les silicates métalliques et la mullite.

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