Process for fabricating fluorine-doped sol-gel article
US6223563A · kind A · utility
7Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2000 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Mar 17, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/905
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention reflects discovery of a liquid phase doping technique that, unlike previous techniques, exhibits very little fluorine depletion upon subsequent heating. The invention involves the steps of providing a silica sol comprising a tetraalkylammonium hydroxide and a di-, tri-, or tetraalkylammonium fluoride, the sol having pH of about 10 to about 14, adding a gelling agent to the sol to induce gelation, casting or extruding the sol to form a gel body, and then drying, heat treating, and sintering the body. Advantageously, the fluorine-containing compound is tetramethylammonium fluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.