Invention Grant
- Patent Title: Glasses and glass ceramics including a metal oxide concentration gradient
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Application No.: US17147663Application Date: 2021-01-13
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Publication No.: US11465937B2Publication Date: 2022-10-11
- Inventor: Guangli Hu , Charlene Marie Smith , Zhongzhi Tang , Steven Alvin Tietje
- Applicant: CORNING INCORPORATED
- Applicant Address: US NY Corning
- Assignee: CORNING INCORPORATED
- Current Assignee: CORNING INCORPORATED
- Current Assignee Address: US NY Corning
- Agent Jeffrey A. Schmidt
- Main IPC: C03C21/00
- IPC: C03C21/00 ; C03C3/091 ; C03C10/00 ; C03C23/00 ; C03C3/093 ; C03C3/097

Abstract:
A glass-based article may include from about 45 mol. % to about 80 mol. % SiO2; from about 0 mol. % to about 10 mol. % Na2O; less than about 5 mol. % K2O; a non-zero amount of Al2O; and an amorphous phase and a crystalline phase. The article may further in include a stress profile comprising a surface compressive stress (CS) and a maximum central tension (CT). A ratio of Li2O (mol. %) to R2O (mol. %) in the article is from about 0.5 to about 1, where R2O is the sum of Li2O, Na2O, and K2O in the article. CT may be greater than or equal to about 50 MPa and less than about 100 MPa. CS may be greater than 2.0·CT. A depth of compression (DOC) of the stress profile may be greater than or equal to 0.14·t and less than or equal to 0.25·t, where t is the thickness of the article.
Public/Granted literature
- US20210130233A1 GLASSES AND GLASS CERAMICS INCLUDING A METAL OXIDE CONCENTRATION GRADIENT Public/Granted day:2021-05-06
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