CHEMICALLY TEMPERED GLASS
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Abstract
Chemically tempered lithium aluminosilicate glasses and methods of tempering are provided. The method allows fast tempering at moderate temperatures, which leads to a deep zone of surface tension with a high level of surface tension.
112 Citations
32 Claims
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1-12. -12. (canceled)
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13. A chemically tempered glass article, comprising:
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a lithium aluminosilicate glass comprising SiO2, Al2O3, Li2O with 4.6 to 5.4% by weight, and Na2O with 8.1 to 9.7% by weight, wherein said glass has a chemical tempered zone of compressive stress at a surface, said zone extending to a depth of at least 50 micrometers into said glass, wherein, in said zone, lithium ions are at least partially exchanged by alkali ions, and wherein said zone exhibits a surface tension of at least 600 MPa. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for producing a chemically tempered glass article, comprising:
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providing a glass is provided comprising SiO2, Al2O3, Li2O with 4.6 to 5.4% by weight; and
Na2O with 8.1 to 9.7% by weight;storing said glass in an alkali-containing salt melt for a period of not more than 8 hours to exchange alkali ions of said glass with larger alkali ions of said alkali-containing salt melt to build up a zone of compressive stress at a surface of said glass; and ensuring said alkali-containing salt melt does not exceed a temperature of 420°
C. during storing said glass,wherein said glass builds a zone of compressive stress having a thickness of at least 50 micrometers and a surface tension of at least 600 MPa. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification