Coatings

Details Coatings Coatings

C - Chemistry, Metallurgy

23

D

117/162

C23D 5/02 (2006.01) B01D 53/86 (2006.01) B01J 13/00 (2006.01) B01J 37/02 (2006.01) B08B 17/02 (2006.01) G21C 3/20 (2006.01)

Patent

CA 1118301

ABSTRACT OF THE DISCLOSURE Gel coatings are produced from sols, which coatings have a lower porosity and higher density than the prior art coatings. Such gel coatings are convertible to ceramic coatings of low porosity and high density even after relatively mild heat treatment. This may be done by using sols comprising unaggregated colloidal primary particles, or aggregated colloidal primary particles with additional components to occupy the gaps in the aggregated particles. A method of providing a substrate with a gel coating is described wherein the substrate is contacted with a sol of a refractory material and capable of being converted to a gel of the refractory material. The bulk density of the gel is at least 40%, preferably at least 45%, of the theoretical density of the refractory material, and the sol is converted to a gel to provide the substrate with the gel coating. A sub- strate carrying an adherent coating of a gel of a refractory material is also described wherein the density of the gel is at least 40% of the theoretical density of the refractory material.

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