STRENGTHENED GLASS SUBSTRATE MANUFACTURING METHOD AND STRENGTHENED GLASS SUBSTRATE
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United States of America Patent
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Feb 12, 2015
app pub date -
Jul 8, 2013
filing date -
Jul 9, 2012
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Abstract
A method of manufacturing a tempered glass substrate includes: melting glass raw materials blended so as to have a glass composition including, in terms of mass %, 40 to 71% of SiO2, 3 to 23% of Al2O3, 0 to 3.5% of Li2O, 7 to 20% of Na2O, and 0 to 15% of K2O; forming the resultant molten glass into a sheet shape; and performing ion exchange treatment in a KNO3 molten salt, the KNO3 molten salt having a controlled concentration of Na ions, to form a compressive stress layer in a surface of the glass.
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