Pressurized heat treatment of glass-ceramic to control thermal e

Details Pressurized heat treatment of glass-ceramic to control thermal e Pressurized heat treatment of glass-ceramic to control thermal e

1984-04-19

1985-08-20

Kellogg, Arthur

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

65 32, 65 33, 65 5922, C03C 2702

Patent

active

045362033

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.

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