Sodium fluormica glass-ceramics
US4624933A · kind A · utility
5Cited by
9References
2Claims
0Family size
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Key dates
| Filing date | Dec 20, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Dec 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/0366
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A family of synthetic mica glass-ceramic compositions is disclosed based on a modified sodium fluoromontmorillonoid stoichiometry. These are spontaneously crystallizable glass-ceramics which are composed of 50-62% SiO.sub.2, 20-28% MgO, 5-15% Na.sub.2 O, and 8-13% F. The method comprises supplying excess fluoride during melting to devise a synthetic mica having sodium fluoromontmorillonoid or a solid solution on the talc axis as the dominant crystal phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.