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US 5,312,791 AGranted
Process for the preparation of ceramic flakes, fibers, and grains from ceramic sols
AssigneeSaint-Gobain/Norton Industrial Ceramics Corporation
InventorsWilliam S. Coblenz, Michael D. Kavanaugh
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Abstract
A process for producing ceramic flake, fiber and grain materials comprising solidifying a hydrated alumina sol, freeze drying the solidified sol and thereafter sintering the freeze dried material is disclosed. Novel ribbed flake material made by the process of the present invention is also disclosed.
Claims18
A process for producing a ceramic material comprising:
- (i) freezing a sol comprising a hydrated alumina material so as to obtain a frozen aqueous phase and a solid hydrated alumina phase;
- (ii) drying the solid hydrated alumina by removing the frozen aqueous phase without causing redispersion in water of the solid hydrated alumina;
- and therafter
- (iii) sintering the dried hydrated alumina to produce a ceramic material.
1 more element
Dependencies are inferred from the claim text.