Pressurized heat treatment of glass-ceramic to control thermal expansion

Patent · Tue Aug 20 00:00:00 EDT 1985

OSTI ID:6041472

Kramer, D P

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.

• Assignee: The United States of America as represented by the Department of Energy
• Patent Number(s): US 4536203
• OSTI ID: 6041472
• Resource Relation: Patent File Date: Filed date 19 Apr 1984; Other Information: PAT-APPL-602035
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CHEMICAL PREPARATION
FABRICATION
THERMAL EXPANSION
THERMODYNAMIC PROPERTIES
GLASS
COMPRESSION
HEAT TREATMENTS
PRESSURE EFFECTS
PRESSURIZING
TEMPERATURE EFFECTS
EXPANSION
PHYSICAL PROPERTIES
SYNTHESIS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360601 - Other Materials- Preparation & Manufacture