Sol-gel process for production of oxide-based glass and ceramic articles
US6620368B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2000 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Jul 13, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/441
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process which uses sol-gel to process oxide-based monoliths which are virtually free of cracks, without nullifying the desired attributes of the oxide-based monoliths. The method comprises substantially drying a wet porous gel monolith by removing a portion of the liquid from the pores of the gel monolith while the gel monolith remains wet, shrinking in size, and becoming correspondingly more dense, then removing the remaining portion of the liquid from the pores of the gel monolith such that the outer region of the gel monolith is not dried before the inner region of the gel monolith is dried. The gel monolith is substantially dried under conditions in which the liquid evaporation rate is no greater than the pore liquid diffusion rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.