Provided is a Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass that has a high permeability to light in a ultraviolet to infrared range and is less likely to be broken. A Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% Si.sub.O2, 5 to 30% Al.sub.2O.sub.3, 1 to 10% Li.sub.2O, 0 to 20% SnO.sub.2, 0 to 5% ZrO.sub.2, 0 to 10% MgO, 0 to 10% P.sub.2O.sub.5, and 0 to 4% TiO.sub.2 and a mass ratio of Li.sub.2O/(MgO+CaO+SrO+BaO+Na.sub.2O+K.sub.2O) is 3 or less.

The present invention relates to a chemically strengthened glass ceramic including a crystalline phase, having two main surfaces opposed to each other, and including an amorphized region in a surface layer of at least one of the main surfaces and a crystallized region inside the glass, in which the amorphized region has a crystallinity of 10 vol % or less at a depth of 100 nm from an outermost surface of the glass.

A glass-ceramic component is provided that has a low average coefficient of thermal expansion (CTE) and a high CTE homogeneity. The use of such a component and a process for producing such a component are also provided.

The present invention discloses a glass material, and a preparation method and a product thereof. The glass material contains a lithium salt crystalline phase and a phosphate crystalline phase. For the entire material, the crystallinity is 40-95%, the lithium salt crystalline phase accounts for 40-90 wt % of the entire material, and the phosphate crystalline phase accounts for 2-15 wt % of the entire material, wherein the lithium salt crystalline phase is one or more of lithium silicate, lithium disilicate and petalite, and the phosphate crystalline phase is aluminum phosphate or/and aluminum metaphosphate. After the glass material of the present invention is toughened, the Vickers hardness (Hv) is 900 kgf/mm.sup.2 or above. The glass material or a substrate of the present invention is suitable for protective members such as mobile terminal equipment and optical equipment and has high hardness and strength. Furthermore, the present invention may also be used for other decorations such as outer frame members of portable electronic equipment.

A transparent article is described herein that includes: a glass-ceramic substrate comprising first and second primary surfaces opposing one another and a crystallinity of at least 40% by weight; and an optical film structure disposed on the first primary surface. The optical film structure comprises a plurality of alternating high refractive index (RI) and low RI layers and a scratch-resistant layer. The article also exhibits an average photopic transmittance of greater than 80% and a maximum hardness of greater than 10 GPa, as measured by a Berkovich Hardness Test over an indentation depth range from about 100 nm to about 500 nm. The glass-ceramic substrate comprises an elastic modulus of greater than 85 GPa and a fracture toughness of greater than 0.8 MPa.Math.√m. Further, the optical film structure exhibits a residual compressive stress of ≥700 MPa and an elastic modulus of ≥140 GPa.

Glass-based articles are provided that exhibit improved fracture resistance. The relationships between properties attributable to the glass composition and stress profile of the glass-based articles are provided that indicate improved fracture resistance.

A glass-ceramic article having greater than or equal to 65.00 wt. % and less than or equal to 80.00 wt. % SiO.sub.2, greater than 4.00 wt. % and less than or equal to 12.00 wt. % Al.sub.2O.sub.3, greater than or equal to 0.10 wt. % and less than or equal to 3.5 wt. % P.sub.2O.sub.5, greater than or equal to 8.00 wt. % and less than or equal to 17.00 wt. % Li.sub.2O, greater than or equal to 4.00 wt. % and less than or equal to 15.00 wt. % ZrO.sub.2, and greater than or equal to 0.05 wt. % and less than or equal to 4.00 wt. % CaO.

In one or more embodiments disclosed herein, an electronic device may include a display device operable to project an image, a front cover substrate positioned over the display device and including a transparent material, and a protective coating disposed on at least a portion of the non-display area of the front cover substrate. The front cover substrate may include a display area over the display device and a non-display area around at least the perimeter of the front cover substrate. The protective coating may include an inorganic material. The protective coating may not be positioned over the display area.

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.sup.−9/μm×diagonal.sup.2) 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 (%)>0.91×10.sup.(2−0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.

A glass-ceramic includes glass and crystalline phases, where the crystalline phase includes non-stoichiometric suboxides of titanium, forming ‘bronze’-type solid state defect structures in which vacancies are occupied with dopant cations.