Process for making chemically bonded sol-gel ceramics
AssigneeThe University of British Columbia
InventorsTomasz Troczynski, Quanzu Yang
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Abstract
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.
Claims7
A process of preparing a chemically bonded sol-gel ceramic comprising:
- (a) preparing an oxide or hydrated oxide ceramic from a sol-gel process;
- (b) impregnating the oxide or hydrated oxide ceramic with a phosphating agent to produce system components;
- and
- (c) heat treating the system components at a temperature between about 300° C. and about 1200° C. to produce a chemically bonded sol-gel ceramic.
A process as claimed in 4 wherein a calcined ceramic filler comprised of powders or fibres of oxides, carbidcs, nitrides, borides, sulphides or mixtures thereof is incorporated in the chemicallly bonded sol-gel ceramic.
Dependencies are inferred from the claim text.