A bioactive glass-ceramic composition as defined herein. Also disclosed are methods of making and using the disclosed compositions.

Embodiments of glass compositions, glass articles and chemically strengthened glass articles are disclosed. In one or more embodiments, the glass composition comprises Li.sub.2O, greater than about 0.9 mol % B.sub.2O.sub.3, Al.sub.2O.sub.3 in an amount greater than or equal to 10 mol %, and from about 60 mol % to about 80 mol % SiO.sub.2. Embodiments of the chemically strengthened glass article include a first major surface and an opposing second major surface defining a thickness t, a compressive stress layer extending from the first major surface to a depth of compression greater than about 0.12 t, a maximum compressive stress of about 200 MPa or greater, and a Knoop Lateral Cracking Scratch Threshold greater than about 6 N, as measured on either one of the first major surface and the second major surface. Methods for forming such chemically strengthened glass articles are also disclosed.

A coated glass or glass ceramic substrate includes a substrate with a surface area and a coating on that surface area. The coating includes a glass matrix and IR-reflecting pigments. The IR-reflecting pigments have a TSR value of at least 20%, as determined according to ASTM G 173. The coating, at a wavelength of 1500 nm, exhibits a remission of at least 35%, as measured according to ISO 13468.

The present disclosure relates to non-metallic articles that can be burner shields having grease flow control and/or chemical resistance. The present disclosure also relates to glass-ceramic burner shields that can have grease flow control and/or chemical resistance, and preferably both.

A glass-ceramic-ferrite composition containing a glass, a ferrite, and a ceramic filler, in which the glass contains, by weight, about 0.5% to about 5.0% R.sub.2O (R represents at least one selected from the group consisting of Li, Na, and K), about 5.0% or less Al.sub.2O.sub.3, about 10.0% to about 25.0% B.sub.2O.sub.3, and about 70.0% to 85.0% SiO.sub.2 with respect to the total weight of the glass, the percentage by weight of the ferrite is about 10% to 80% with respect to the total weight of the composition, the ceramic filler contains at least forsterite selected from forsterite and quartz, the percentage by weight of the forsterite is about 1% to about 10% with respect to the total weight of the composition, and the percentage by weight of the quartz is about 40% or less with respect to the total weight of the composition.

Glass-based articles that include a compressive stress layer extending from a surface of the glass-based article to a depth of compression are formed by exposing glass-based substrates to water vapor containing environments. The glass-based substrates have compositions selected to avoid the formation of haze during the treatment process. The methods of forming the glass-based articles may include elevated pressures and/or multiple exposures to water vapor containing environments selected to avoid the formation of haze during the treatment process.

Embodiments of glass ceramic articles and precursor glasses are disclosed. In one or more embodiments, the glass-ceramic articles are transparent and include a nepheline phase and a phosphate phase. The glass-ceramic articles are colorless and exhibit a transmittance of about 70% or greater across the visible spectrum. The glass-ceramic articles may optionally include a lithium aluminosilicate phase. The crystals of the glass-ceramic articles may have a major cross-section of about 100 nm or less.

A glass powder is a glass powder comprising vanadium-tellurium-silver, which has a softening temperature of 230-330° C. and a median particle size of 1-2 μm; when the glass powder is applied to the silver paste, the requirement that the silver paste is sintered at the temperature of 230-400° C. can be met, and a firm three-dimensional network structure can be formed in the glass system after the silver paste is sintered, and the welding tension of a front silver electrode can be improved; the addition of other metal elements to the glass powder can enable the network structure of the glass powder to be more compact and complete and ensure the stability of the glass powder; the prepared silver paste can be sintered at a temperature of 230-400° C.

The present invention provides a microcrystalline glass and microcrystalline glass product with excellent mechanical properties, microcrystalline glass product, the components of which, expressed in weight percent, contain: SiO.sub.2: 65 ∼80%; AI.sub.2O.sub.3: below 5%; Li.sub.2O: 10 ∼25%; ZrO.sub.2: 5 ∼15%; P.sub.2O.sub.5: 1 ∼8%. Through the reasonable component design, the microcrystalline glass product obtained by the present invention have excellent mechanical properties.

A compositional range of manganese aluminosilicate glass-ceramics with high durability, and methods for making the same, are described herein. The glass-ceramics can be used in conjunction with electronic devices, such as in protective exteriors for such devices. The glass-ceramics can be characterized as having ring-on-ring strengths of at least 300 MPa and fracture toughnesses of at least 1.5 MPa.Math.m.sup.1/2.