	US 12,371,367 B2
	High strength glass-ceramics
George Halsey Beall, Big Flats, NY (US); Qiang Fu, Painted Post, NY (US); and Charlene Marie Smith, Corning, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Aug. 7, 2024, as Appl. No. 18/796,933.
Application 18/131,556 is a division of application No. 17/119,037, filed on Dec. 11, 2020, granted, now 11,634,357, issued on Apr. 25, 2023.
Application 16/835,878 is a division of application No. 16/564,340, filed on Sep. 9, 2019, granted, now 11,168,021, issued on Nov. 9, 2021.
Application 16/564,340 is a division of application No. 16/181,815, filed on Nov. 6, 2018, granted, now 10,427,975, issued on Oct. 1, 2019.
Application 18/796,933 is a continuation of application No. 18/736,100, filed on Jun. 6, 2024, granted, now 12,098,090.
Application 18/736,100 is a continuation of application No. 18/585,702, filed on Feb. 23, 2024, granted, now 12,049,423, issued on Jul. 30, 2024.
Application 18/585,702 is a continuation of application No. 18/131,556, filed on Apr. 6, 2023, granted, now 11,952,306, issued on Apr. 9, 2024.
Application 17/119,037 is a continuation of application No. 17/024,299, filed on Sep. 17, 2020, granted, now 11,034,610, issued on Jun. 15, 2021.
Application 17/024,299 is a continuation of application No. 16/835,878, filed on Mar. 31, 2020, granted, now 11,148,968, issued on Oct. 19, 2021.
Application 16/181,815 is a continuation of application No. 15/904,926, filed on Feb. 26, 2018, granted, now 10,189,741, issued on Jan. 29, 2019.
Application 15/904,926 is a continuation of application No. 14/878,133, filed on Oct. 8, 2015, granted, now 10,239,780, issued on Mar. 26, 2019.
Claims priority of provisional application 62/205,120, filed on Aug. 14, 2015.
Claims priority of provisional application 62/061,385, filed on Oct. 8, 2014.
Prior Publication US 2025/0042804 A1, Feb. 6, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. C03C 10/00 (2006.01); C03B 32/02 (2006.01); C03C 3/097 (2006.01); C03C 4/02 (2006.01); C03C 21/00 (2006.01)

CPC C03C 10/0027 (2013.01) [C03B 32/02 (2013.01); C03C 3/097 (2013.01); C03C 4/02 (2013.01); C03C 10/0054 (2013.01); C03C 21/002 (2013.01); C03C 2204/00 (2013.01)]

20 Claims

1. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO₂);

at least 7 wt % and no more than 20 wt % lithia (Li₂O);

zero to no more than 5 wt % sodium oxide (Na₂O);

at least 0.5 wt % and no more than 15 wt % zirconia (ZrO₂);

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li₂Si₂O₅);

wherein the lithium disilicate is a primary crystalline phase;

wherein grains in the glass-ceramic article have a length of less than 100 nm;

wherein crystals of the lithium disilicate are interlocking, thereby influencing mechanical properties of the glass-ceramic article; and

wherein the glass-ceramic article has fracture toughness of 1 MPa·m^1/2or greater.

13. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO₂);

at least 7 wt % and no more than 20 wt % lithia (Li₂O);

zero to no more than 5 wt % sodium oxide (Na₂O);

at least 0.5 wt % and no more than 15 wt % zirconia (ZrO₂);

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li₂Si₂O₅);

wherein the lithium disilicate is a primary crystalline phase;

wherein grains in the glass-ceramic article have a length of less than 100 nm;

wherein crystals of the lithium disilicate are interlocking, thereby influencing mechanical properties of the glass-ceramic article; and

wherein the glass-ceramic article has a Vickers hardness of at least 600 kgf/mm²and no more than 900 kgf/mm².

18. A glass-ceramic article, comprising in oxide wt %:

at least 55 wt % and no more than 75 wt % silica (SiO₂);

at least 12 wt % and no more than 20 wt % lithia (Li₂O);

at least 1 wt % and no more than 6 wt % phosphorous pentoxide (P₂O₅)

zero to no more than 5 wt % sodium oxide (Na₂O);

zero to no more than 4 wt % potash (K₂O);

at least 3 wt % and no more than 15 wt % zirconia (ZrO₂);

zero to no more than 5 wt % magnesia (MgO);

zero to no more than 10 wt % zinc oxide (ZnO);

wherein the glass-ceramic article comprises a crystalline phase and a glass phase;

wherein the crystalline phase comprises lithium disilicate (Li₂Si₂O₅);

wherein the lithium disilicate is a primary crystalline phase and the glass-ceramic;

wherein grains in the glass-ceramic article have a length of less than 100 nm, thereby facilitating transparency thereof;

wherein the glass-ceramic article is transparent such that average transmittance of the glass-ceramic article along a 1 mm pathlength is 85% or greater for light between 400 nm to 1000 nm.