US 11,724,961 B2
White glass-ceramic substrates and articles including tetragonal zirconia crystalline phase, and method of manufacturing the same
Carol Ann Click, Corning, NY (US); Qiang Fu, Painted Post, NY (US); Mathieu Gerard Jacques Hubert, Corning, NY (US); Charlene Marie Smith, Corning, NY (US); and Alana Marie Whittier, Painted Post, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Jun. 25, 2021, as Appl. No. 17/358,818.
Claims priority of provisional application 63/045,934, filed on Jun. 30, 2020.
Prior Publication US 2021/0403373 A1, Dec. 30, 2021
Int. Cl. C03C 10/00 (2006.01); C03C 21/00 (2006.01); C03C 4/02 (2006.01)
CPC C03C 10/0027 (2013.01) [C03C 4/02 (2013.01); C03C 10/0036 (2013.01); C03C 21/002 (2013.01); C03C 21/005 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A glass-ceramic article comprising:
a composition at a center-volume comprising, on an oxide basis:
55-75 mol % SiO2;
0.2-10 mol % Al2O3;
0-5 mol % B2O3;
15-30 mol % Li2O;
0-2 mol % Na2O;
0-2 mol % K2O;
0-5 mol % MgO;
0-2 mol % ZnO;
0.2-3.0 mol % P2O5;
0.1-10 mol % ZrO2;
0-4 mol % TiO2; and
0-1.0 mol % SnO2;
wherein (i) lithium disilicate and (ii) either β-spodumene or β-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article;
wherein the glass-article further comprises tetragonal ZrO2 as a crystalline phase; and
wherein one of the following is true: (i) the composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article comprises over 10 mol % Na2O, with the mole percentage of Na2O decreasing from the primary surface towards the center-volume (ii) the mole percentage of Na2O within the glass-ceramic article decreases as a function of depth into the thickness of the glass-ceramic article from the primary surface, with the maximum mole percentage of Na2O at any depth being 7 mol % Na2O, and sodium ions are present within the glass-ceramic article to a depth of at least 15 percent of the thickness from the primary surface.