METHOD FOR MANUFACTURING TEMPERED GLASS
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United States of America Patent
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Aug 10, 2017
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Jan 22, 2015
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Feb 14, 2014
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Abstract
The present invention relates to a method for manufacturing tempered glass and, more specifically, to a method for manufacturing alkali-free glass which has the thickness of 2.0 mm or less into tempered glass by means of heat treatment and surface treatment using fluosilicic acid. To this end, the present invention provides a method for manufacturing tempered glass, the method comprising: a preparation step for preparing alkali-free glass; a surface treatment step for surface-treating the alkali-free glass by means of a surface treatment solution comprising fluosilicic acid and thereby generating on the surface of the alkali-free glass a porous SiO2-rich layer of which the coefficient of thermal expansion (CTE) is smaller than the CTE of the inner part of the alkali-free glass; and a heat treatment step for heat-treating the alkali-free glass that has been surface-treated and thereby generating compressive stress on the surface of the alkali-free glass.
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