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1. (WO2017177114) GLASS-BASED ARTICLES INCLUDING A METAL OXIDE CONCENTRATION GRADIENT

Pub. No.:    WO/2017/177114    International Application No.:    PCT/US2017/026561
Publication Date: Fri Oct 13 01:59:59 CEST 2017 International Filing Date: Sat Apr 08 01:59:59 CEST 2017
IPC: C03C 3/091
C03C 3/093
C03C 21/00
C03C 10/00
C03C 3/097
Applicants: CORNING INCORPORATED
Inventors: DEJNEKA, Matthew John
GOMEZ, Sinue
HU, Guangli
SMITH, Charlene Marie
TANG, Zhongzhi
TIETJE, Steven Alvin
Title: GLASS-BASED ARTICLES INCLUDING A METAL OXIDE CONCENTRATION GRADIENT
Abstract:
Embodiments of a glass-based article including a first surface and a second surface opposing the first surface defining a thickness (t) of about 3 millimeters or less (e.g., about 1 millimeter or less), and a stress profile, wherein all points of the stress profile between a thickness range from about 0∙t up to 0.3∙t and from greater than about 0.7∙t up to t, comprise a tangent with a slope having an absolute value greater than about 0.1 MPa/micrometer, are disclosed. In some embodiments, the glass-based article includes a non-zero metal oxide concentration that varies along at least a portion of the thickness (e.g., 0∙t to about 0.3∙t) and a maximum central tension in the range from about 80 MPa to about 100 MPa. In some embodiments, the concentration of metal oxide or alkali metal oxide decreases from the first surface to a value at a point between the first surface and the second surface and increases from the value to the second surface. The concentration of the metal oxide may be about 0.05 mol% or greater or about 0.5 mol% or greater throughout the thickness. Methods for forming such glass-based articles are also disclosed.