US 12,006,248 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. 20, 2023, as Appl. No. 18/211,702.
Application 18/211,702 is a division of application No. 17/358,818, filed on Jun. 25, 2021, granted, now 11,724,961.
Claims priority of provisional application 63/045,934, filed on Jun. 30, 2020.
Prior Publication US 2023/0348319 A1, Nov. 2, 2023
Int. Cl. C03C 10/00 (2006.01); C03C 4/02 (2006.01); C03C 21/00 (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)] 20 Claims
OG exemplary drawing
 
1. A method of manufacturing a glass-ceramic article comprising:
(a) maintaining a precursor glass in an environment for a first time period of 1.75 to 4.25 hours while the environment has a first temperature of 590° C. to 820° C., the precursor glass having a composition 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;
(b) maintaining the precursor glass in the environment for a second time period of 0.75 hour to 4.25 hours while the environment has a second temperature of 850° C. to 925° C., forming a glass-ceramic substrate, wherein (i) lithium disilicate and (ii) either β-spodumene or β-quartz are the two predominant crystalline phases by weight percentage of the glass-ceramic substrate, and wherein tetragonal ZrO2 is a crystalline phase of the glass-ceramic substrate; and
(c) subjecting the glass-ceramic substrate to an ion-exchange treatment in a molten salt bath that comprises a salt of one or more of ionic Na, K, and Ag, forming a glass-ceramic article.