Method of producing dense refractory oxide coatings on metallic

Details Method of producing dense refractory oxide coatings on metallic Method of producing dense refractory oxide coatings on metallic

1978-10-25

1981-10-27

Cannon, James C.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

148 28, 148 315, 148 38, 376457, 376900, 208 48R, 252317, 252466B, 252466PT, 4232132, 4232135, 427372A, 427380, 427419A, 427419B, 428469, 4273977, 4274192, 4274193, B01J 2108, B01J 2310, B01J 2356, B32B 1518

Patent

active

042972469

ABSTRACT:
The invention is concerned with providing substrates with coatings obtainable from sols, for example to protect the substrate (such as in nuclear reactors or hydrocarbon cracking plant) or to provide a carrier for catalytically active material.
Hitherto, coatings obtained from sols have had a high porosity and high surface area so that they have not been entirely satisfactory for the above applications.
In the invention, dense, low-porosity coatings are provided by contacting the substrate with a sol of refractory material (e.g. CeO.sub.2 or SiO.sub.2) convertible to a gel of density at least 40% of the theoretical density of the refractory material, and converting the sol to the gel. Optionally, the gel may be converted to a ceramic coating by firing.

REFERENCES:
patent: 3133829 (1964-05-01), Cupery et al.
patent: 3518050 (1970-06-01), Woodhead
patent: 3761571 (1973-09-01), Woodhead
patent: 3785998 (1974-01-01), Hoekstra
patent: 3893950 (1975-07-01), Mai et al.
patent: 3894963 (1975-07-01), Gerdes et al.
patent: 3920583 (1975-11-01), Pugh
patent: 3957692 (1976-05-01), Cairns et al.
patent: 3966645 (1976-06-01), Cairns et al.
patent: 4070286 (1978-01-01), Iler et al.
patent: 4096095 (1978-06-01), Cairns

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