CPC B32B 7/028 (2019.01) [B32B 17/06 (2013.01); C03C 3/091 (2013.01); C03C 3/097 (2013.01); C03C 4/18 (2013.01); B32B 2250/03 (2013.01); B32B 2307/308 (2013.01); C03C 21/002 (2013.01); C03C 2204/00 (2013.01)] | 20 Claims |
1. A glass substrate comprising:
a glass clad layer fused to a glass core layer, wherein:
the glass core layer comprises a core glass composition having an average core coefficient of thermal expansion (CTEcore);
the glass clad layer comprises a clad glass composition having an average clad coefficient of thermal expansion (CTEclad) that is less than the CTEcore;
a maximum tensile stress in the glass core layer is less than 15 MPa; and
a compressive stress in the glass substrate extends from a surface of the glass clad layer to a depth of compression of greater than or equal to 10% of a total thickness of the glass substrate; and
the clad glass composition comprises boron and greater than or equal to 55 wt. % SiO2 and less than or equal to 80 wt. % SiO2.
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