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Title: Pressurized heat treatment of glass ceramic

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.
Authors:
Publication Date:
OSTI Identifier:
6368058
DOE Contract Number:
AC04-76DP00053
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; PRODUCTION; GLASS; HEAT TREATMENTS; METALS; PRESSING; PRESSURIZING; SEALS; THERMAL EXPANSION; ELEMENTS; EXPANSION; FABRICATION; MATERIALS WORKING 360201* -- Ceramics, Cermets, & Refractories-- Preparation & Fabrication