Corning Incorporated

Mathieu Gerard Jacques Hubert

Carol Ann Click

Charlene Marie Smith

Qiang Fu

Jill Marie Hall

John Robert Saltzer, Jr

Andrew Peter Kittleson

Rohit Rai

Zheming Zheng

Matthew Daniel Trosa

James Howard Edmonston

Katherine Weber Kroemer

Ljerka Ukrainczyk

Bin Yang

John Richard Ridge

Dhananjay Joshi

Alana Marie Whittier

Galan Gregory Moore

Shelby Kerin Wilson

Erika Lynn Stapleton

Indrajit Dutta

Shuo Cui

Ozgur Gulbiten

I-Wen Chou

A method for forming glass ceramic articles includes heating a stack of glass sheets to a nucleation temperature to create a nucleated crystallizable stack of sheets; heating the nucleated crystallizable stack of glass sheets to a crystallization temperature; and maintaining the crystallization temperature for a predetermined period of time to produce the glass-ceramic articles. The stack of glass sheets has a mass index of less than or equal to 35.

Methods for forming glass ceramic articles

A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (μm)<(3.65×10/μm×diagonal) where diagonal is a diagonal measurement of the glass ceramic article in μm, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)<0.0994t+0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)>0.91×10of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.

Glass ceramic articles having improved properties and methods for making the same

A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO; 0.2-10 mol % AlO; 0-5 mol % BO; 15-30 mol % LiO; 0-2 mol % NaO; 0-2 mol % KO; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % PO; 0.1-10 mol % ZrO; 0-4 mol % TiO; and 0-1.0 mol % SnO. Lithium disilicate and either β-spodumene or β-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrOas a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % NaO (on an oxide basis), with the mole percentage of NaO decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.

White glass-ceramic substrates and articles including tetragonal zirconia crystalline phase, and method of manufacturing the same

A method for ceramming a glass article to a glass-ceramic includes placing a glass article into a heating apparatus, and heating the glass article to a first hold temperature at a first predetermined heating rate. The glass article is held at the first hold temperature for a first predetermined duration. The viscosity of the glass article is maintained within log viscosity &#xb1;1.0 poise during the first predetermined duration. The glass article is then heated from the first hold temperature to a second hold temperature at a second predetermined heating rate. The glass article is held at the second hold temperature for a second duration. A density of the glass article is monitored from the heating of the glass article from the first hold temperature through the second duration, and the second duration is ended when an absolute value of a density rate of change of the glass article is less than or equal to 0.10 (g/cm)/min.

Methods for ceramming glass with nucleation and growth density and viscosity changes

A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO; 0.2-10 mol % AlO; 0-5 mol % BO; 15-30 mol % LiO; 0-2 mol % NaO; 0-2 mol % KO; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % PO; 0.1-10 mol % ZrO; 0-4 mol % TiO; and 0-1.0 mol % SnO. Lithium disilicate and either &#x3b2;-spodumene or &#x3b2;-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrOas a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % NaO (on an oxide basis), with the mole percentage of NaO decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.

A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (&#x3bc;m)&#x3c;(3.65&#xd7;10/&#x3bc;m&#xd7;diagonal) where diagonal is a diagonal measurement of the glass ceramic article in &#x3bc;m, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)&#x3c;0.0994t+0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)&#x3e;0.91&#xd7;10of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.

Glass stack configurations including a carrier plate, setter plates, and glass sheets for thermal treatment of the glass sheets to form glass ceramic articles are provided. The glass stacking configurations and components described herein are selected to improve thermal uniformity throughout a glass stack during ceramming processes while maintaining or even reducing the stresses in the resultant glass ceramic article. Accordingly, the glass ceramic articles made according to the various embodiments described herein exhibit improved optical qualities and less warp than glass ceramic articles made according to conventional processes. Various embodiments of carrier plates, setter plates, parting agent compositions, and methods of stacking glass sheets are described.

Methods of ceramming glass articles having improved warp

A black &#x3b2;-spodumene lithium disilicate glass ceramic is provided. The glass ceramic includes at least one of magnetite, &#x3b2;-quartz, cristobalite, and lithium phosphate as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 15.0 to 35.0, a*: &#x2212;3.0 to 3.0, and b*: &#x2212;5.0 to 5.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.

Black beta-spodumene lithium silicate glass ceramics

A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (&#x3bc;m)&#x3c;(3.65&#xd7;10/&#x3bc;m&#xd7;diagonal) where diagonal is a diagonal measurement of the glass ceramic article in &#x3bc;m, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)&#x3c;0.0994t +0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)&#x3e;0.91&#xd7;10of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.

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Corning, NY, United States of America

Mathieu Gerard Jacques Hubert