Process for making chemically bonded sol-gel ceramics

Details Process for making chemically bonded sol-gel ceramics Process for making chemically bonded sol-gel ceramics

C - Chemistry, Metallurgy

04

B

C04B 41/50 (2006.01) C04B 35/622 (2006.01) C04B 35/624 (2006.01) C04B 41/45 (2006.01) C23C 18/12 (2006.01)

Patent

CA 2382591

This invention relates to a novel method of decreasing porosity of ceramics produced by sol-gel processing. The process of preparing chemically bonded sol- gel ceramics comprises phosphating a sol-gel derived oxide or hydrated oxide and polymerizing the phosphated product with heat treatment. Such combined sol- gel/chemical bonding process can be used to fabricate dense, thick ceramics or ceramic coatings for a variety of applications, including high temperature corrosion protection, wear resistance, dielectric properties, non-sticky surfaces, bio-active ceramics, thermal barrier ceramics, non-wetted surfaces, and others.

L'invention concerne un nouveau procédé servant à diminuer la porosité de céramiques fabriquées au moyen d'un traitement sol-gel. Ce procédé de préparation de céramiques sol-gel agglutinées chimiquement consiste à phosphater un oxyde dérivé de sol-gel ou un oxyde hydraté et à polymériser le produit phosphaté au moyen d'un traitement thermique. On peut utiliser ce procédé combiné sol-gel/agglutination chimique afin de fabriquer des céramiques denses et épaisses ou des revêtements céramiques pour une variété d'applications, y compris protections contre corrosion à température élevée, résistance à l'usure, propriétés diélectriques, surfaces non collantes, céramiques bio-actives, céramiques créant une barrière thermique, surfaces non mouillées.

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