Cordierite ceramic body having low thermal expansion coefficient, process for producing the same, and method of evaluating cordierite composition
US4851376A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/195
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing a cordierite ceramic body by using a reclaimed cordierite composition for a cordierite ceramic article which has a composition similar to that of the cordierite ceramic body. The process includes the steps of: forming a desired formed body under a pressure by using a starting material which includes the recovered reclaimed cordierite composition, or a mixture of the reclaimed cordierite composition and a fresh cordierite composition; firing the formed body at a temperature between 1280.degree.-1330.degree. C. into a sample of the cordierite ceramic body; measuring a reaction ratio (R) between the amount of protoenstatite and cordierite crystals present in the sample; and formulating the starting material so that the reaction ratio (R) is 0.3 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.