Method of producing dense refractory oxide coatings on metallic substrates and the production of catalysts from the coated substrates
US4297246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1978 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Oct 25, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S376/90
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.