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Method of Annealing Glass Articles

IP.com Disclosure Number: IPCOM000081718D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

A procedure is provided for annealing glass structures so as to reduce their residual stress.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Method of Annealing Glass Articles

A procedure is provided for annealing glass structures so as to reduce their residual stress.

The glass panel to be annealed is encased in an aluminum housing whose walls are 1/4 to 1/2 inch thick. In a particular example, the encased glass was heated to a temperature of 480 degrees C, the initial temperature of the glass, and cooling began at this temperature at the rate of 3.5 degrees C/min until room temperature was reached.

Such heating and cooling in the encased aluminum housing resulted in a substantially stress-free panel, due mainly to the fact that a uniform thermal distribution existed in the panel throughout the annealing cycle. By encasing the glass in aluminum, faster cooling rates can e tolerated and low-temperature gradients throughout the glass panel were maintained during such cooling.

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