A glass-ceramic article includes from 60 mol % to 72 mol % SiO2; from 2.5 mol % to 8 mol % Al.sub.2O.sub.3; from 17 mol % to 26 mol % Li.sub.2O; from 0.2 mol % to 4 mol % ZrO.sub.2; and from 0.5 mol % to 2 mol % P.sub.2O.sub.5. The sum of alkaline earth oxides and transitional metal oxides in the glass-ceramic article may be from 0.1 mol % to 6 mol %, wherein alkaline earth oxides is the sum of CaO, MgO, SrO, and BaO and transition metal oxides is the sum of La.sub.2O.sub.3, Y.sub.2O.sub.3, Ta.sub.2O.sub.5, and GeO.sub.2. The sum of P.sub.2O.sub.5 and ZrO.sub.2 in the glass-ceramic article may be from 1 mol % to 6 mol %. The glass-ceramic article may comprise a crystalline phase comprising lithium disilicate and petalite. The total amount of lithium disilicate and petalite in the crystalline phase of the glass-ceramic article may be greater than 50 wt %, based on a total weight of the crystalline phase.

Glass articles with infrared reflectivity and methods for making the same are disclosed herein. In one embodiment, glass article having infrared reflectivity includes a first surface, a second surface and a body extending between the first and second surfaces. A plurality of discrete layers of metallic silver are formed in the body creating at least one optical cavity in the body. Each discrete layer may have a thickness T such that 100 nm≤T≤250 nm and may be spaced apart from adjacent layers of metallic silver by a spacing S≤500. The glass article reflects at least a portion of electromagnetic radiation incident on the glass article having a wavelength from 800 nm to 2500 nm and transmits at least a portion of electromagnetic radiation incident on the glass article having a wavelength from 390 nm to 750 nm.

In embodiments, a conveyor apparatus can include a conveyor ribbon having a length, a width, a thickness less than the width, and a plurality of receiving apertures located along the length and extending through the thickness of the conveyor ribbon. The plurality of receiving apertures are dimensioned to receive and hold a plurality of glass articles. A conveyor drive and guidance system directs the conveyor ribbon along a predefined conveyor path. The predefined conveyor path can include an immersion section and a drain section. The immersion section can be oriented to direct the conveyor ribbon into and out of an immersion station and the conveyor ribbon is rotated about a horizontal axis in the drain section after being directed out of the immersion station.

A property-enhanced cover sheet, and methods for forming a property-enhanced cover sheet, for a portable electronic device are disclosed. A property-enhanced cover sheet is formed by thermoforming a glass sheet into a specified contour shape while modifying one or more properties of the glass. Other property-enhanced sheets can be formed by layering two or more glass sheets having different material properties, and then thermoforming the layered sheets into a required contour shape. Property enhancement for a cover sheet includes, hardness, scratch resistance, strength, elasticity, texture and the like.

A glass for chemical strengthening has a Young's modulus E of 70 GPa or more. The glass satisfies X.sub.1+X.sub.2+X.sub.3 being 1760 or less. Here, X.sub.1 is a numerical value equivalent to a value [unit: kPa/° C.] obtained by multiplying the Young's modulus E by an average coefficient α of thermal expansion at 50° C. to 350° C., X.sub.2 is a numeral value equivalent to a value of a temperature Tf [unit: ° C.] at which a viscosity of the glass reaches 100 MPa.Math.s, and X.sub.3 is a numerical value equivalent to a value of a difference [unit: 10.sup.5 Pa.Math.s] between the viscosity (100 MPa.Math.s) at the Tf and a viscosity η.sub.+10 at a temperature 10° C. higher than the Tf.

Embodiments of a method of cold-forming a glass article are disclosed. In one or more embodiments, the method includes bending a glass sheet over the chuck such that a first major surface of the glass sheets conforms to a bending surface of the chuck. In one or more embodiments, the method includes adhering a frame to the second major surface of the glass sheet such that at least one spacer is positioned between the glass sheet and the frame.

A glass-ceramic article includes a crystalline phase; a residual glass phase; greater than or equal to 52 mol % and less than or equal to 70 mol % SiO.sub.2, greater than or equal to 14 mol % and less than or equal to 35 mol % Li.sub.2O, greater than or equal to 0.1 mol % and less than or equal to 15 mol % CaO, greater than or equal to 0.5 mol % and less than or equal to 10 mol % ZrO.sub.2; and greater than or equal to 0.5 mol % and less than or equal to 5 mol % P.sub.2O.sub.5.

A colored glass article includes greater than or equal to 50 mol % and less than or equal to 70 mol % SiO.sub.2, greater than or equal to 10 mol % and less than or equal to 17.5 mol % Al.sub.2O.sub.3, greater than or equal to 3 mol % and less than or equal to 10 mol % B.sub.2O.sub.3, greater than or equal to 8.8 mol % and less than or equal to 14 mol % Li.sub.2O, greater than or equal to 1.5 mol % and less than or equal to 8 mol % Na.sub.2O, and greater than 0 mol % and less than or equal to 2 mol % Cr.sub.2O.sub.3. R.sub.2O+RO−Al.sub.2O.sub.3 is greater than or equal to 0.5 mol % and less than or equal to 6 mol %. Al.sub.2O.sub.3+MgO+ZnO is greater than or equal to 12 mol % and less than or equal to 22 mol %.

A glass composition includes greater than or equal to 50 mol % and less than or equal to 70 mol % SiO.sub.2; greater than or equal to 10 mol % and less than or equal to 20 mol % Al.sub.2O.sub.3; greater than or equal to 1 mol % and less than or equal to 10 mol % B.sub.2O.sub.3; greater than or equal to 7 mol % and less than or equal to 14 mol % Li.sub.2O; greater than 0 mol % and less than or equal to 8 mol % Na.sub.2O; greater than 0 mol % and less than or equal to 1 mol % K.sub.2O; greater than or equal to 0 mol % and less than or equal to 7 mol % CaO; greater than or equal to 0 mol % and less than or equal to 8 mol % MgO; and greater than or equal to 0 mol % and less than or equal to 8 mol % ZnO. R.sub.2O+R′O is less than or equal to 25 mol %, wherein R.sub.2O is the sum of Li.sub.2O, Na.sub.2O, and K.sub.2O and R′O is the sum of CaO, MgO, and ZnO. The glass composition includes at least one of NiO+CO.sub.3O.sub.4+Cr.sub.2O.sub.3+CuO is greater than or equal to 0.001 mol %, CeO.sub.2 is greater than or equal to 0.1 mol %, and TiO.sub.2 is greater than or equal to 0.1 mol %.

A colored glass article may include 50-80 mol % SiO.sub.2; 7-20 mol % Al.sub.2O.sub.3; 1-35 mol % R.sub.2O, wherein R.sub.2O comprises at least one of Li.sub.2O, Na.sub.2O, and K.sub.2O; 1×10.sup.−6-10 mol % of a colorant, wherein the colorant comprises at least one of Cr.sub.2O.sub.3, Au, Ag, CuO, NiO, Co.sub.3O.sub.4, TiO.sub.2, CeO.sub.2; and 12-24 mol % of Al.sub.2O.sub.3+MgO+CaO+ZnO. The colored glass article may have a transmittance color coordinate in the CIELAB color space with an L* value of 55 to 96.5. The colored glass article may have a compressive stress profile with a depth of compression ≥0.15t, a thickness t from 0.4 mm-5 mm, a compressive stress ≥200 MPa, and a central tension ≥60 MPa. The colored glass article may have a dielectric constant from 5.6 to 6.4 over the frequency range from 10 GHz to 60 GHz.