Process for making thick-walled ceramic bodies from synthetic micas
US4622057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1985 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | May 16, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C10/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The instant invention is directed to the production of boards and other relatively thick-walled shapes of various configurations from inorganic silicates. The method for preparing such products involves five general steps: first a fully or predominantly crystalline body is formed containing crystals consisting essentially of a lithium and/or sodium water-swelling mica selected from the group of fluorhectorite, boron fluorphlogopite, and solid solutions therebetween; second, that body is contacted with a polar liquid, customarily water, to cause swelling and disintegration of the body accompanied with the formation of a gel; third, the gel is contacted with a source of large cations to effect an ion exchange reaction between the large cations and the Li.sup.+ and/or Na.sup.+ ions in the gel and to cause flocculation of the gel; fourth, the floc is substantially separated from the polar liquid and a shape of a desired geometry formed therefrom; and, fifth, the shaped body is fired at a temperature in excess of 700.degree. C., but below about 1100.degree. C., to minimize the normal hygroscopic tendencies in the materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.