Pressurized heat treatment of glass-ceramic to control thermal expansion
US4536203A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1984 |
| Grant date | Aug 20, 1985 |
| Priority date | — |
| Expiry date | Apr 19, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C10/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is also used to determine the pressure in the environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.