The disclosure relates to bioactive glasses for use in biomedical applications. In particular, the glasses described herein are phosphate glasses that show fast filling rates of dentin tubules and have advantageous release rates of metal ions, which provide advantages in antibacterial applications and wound healing.

The present invention relates to a glass ceramic having a three-dimensional shape including plural R-shapes including a smallest R-shape whose average radius of curvature is 5.0×10.sup.2 mm or less and a largest R-shape whose average radius of curvature is 1.0×10.sup.3 mm or more, having a maximum value of retardations of 20 nm/mm or less, and having a haze value converted into a value corresponding to a thickness of 0.8 mm of 1.0% or less in the largest R-shape.

A cover glass made of a glass ceramic that is silica based and has a main crystal phase of high quartz solid solution or keatite solid solution is provided. The cover glass has a stress profile with at least one inflection point at a depth of the cover glass of more than 10 μm, a thickness from 0.1 mm to 2 mm, and a chemical tempering structure with a surface compressive stress of at least 250 MPa and at most 1500 MPa. A process for producing the cover glass is provided that includes producing a silica based green glass, hot shaping the silica based green glass, thermally treating the silica based green glass with a nucleation step and a ceramization step, and performing an ion exchange at an exchange bath temperature for a duration of time in an exchange bath.

The present invention relates to a manufacturing method for a chemically strengthened glass, the method including: performing a first ion exchange by immersing a glass for chemical strengthening containing first alkali metal ions in a first molten salt composition containing second alkali metal ions; after the first ion exchange, performing a second ion exchange by immersing the chemically strengthened glass obtained after the first ion exchange in a second molten salt composition containing the first metal ions and third alkali metal ions; continuously using the first molten salt composition after being used for the first ion exchange; and continuously using a second molten salt composition after being used for the second ion exchange, in which: a concentration of the second molten salt composition is controlled by adding the first alkali metal ions to the second molten salt composition and a resulting second molten salt composition is used continuously.

A laminated glass article comprises a core layer comprising a core glass composition having an average core coefficient of thermal expansion (CTE.sub.core) and a clad layer directly adjacent to the core layer and comprising a clad glass composition having an average clad coefficient of thermal expansion (CTE.sub.clad) that is less than the CTE.sub.core such that the clad layer is in compression and the core layer is in tension. A compressive stress of the clad layer increases with increasing distance from the outer surface of the clad layer, transitions to a minimum tensile stress as a step-change at an interface region between the core layer and the clad layer, and a magnitude of the tensile stress increases continuously to a maximum tensile stress in the core layer. Other stress profiles, and methods of preparing laminated glass articles are also disclosed.

A glass manufacturing apparatus includes a first nozzle including a first orifice facing a travel path. The glass manufacturing apparatus includes a gas source in fluid communication with the first nozzle, with the gas source directing a gas flow to the first nozzle. The glass manufacturing apparatus includes a controller coupled to one or more of the gas source or the first nozzle to vary the gas flow from the gas source the first nozzle such that the first nozzle is discharges a series of gas bursts through the first orifice toward the travel path at a frequency within a range from about 10 Hz to about 45 Hz. A second nozzle is spaced apart from the first nozzle. The second nozzle includes a second orifice facing the travel path. The second nozzle discharges a continuous gas flow through the second orifice toward the travel path.

A glass has a maximum crystallization rate (KG.sub.max) of at most 0.20 μm/min in a temperature range of 700° C. to 1250° C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985. In the case of a sample thickness of 2 mm of the glass, a ratio of a minimum transmittance in a wavelength range of 850 nm to 950 nm to a maximum transmittance in a wavelength range of 250 nm to 700 nm is in a range of 1.9:1 to 15:1.

A glass includes cations of the following components in the indicated amounts (molar proportion in cat.-%): 30-80 cat.-% silicon; 0-20 cat.-% boron; 0-2 cat.-% aluminum; 5-35 cat.-% sodium; 2-25 cat.-% potassium; 0-0.5 cat.-% nickel; 0-0.5 cat.-% chromium; and 0.03-0.5 cat.-% cobalt. A sum of the molar proportions of cations of sodium and potassium is in a range of from 15 to 50 cat.-%, a sum of the molar proportions of cations of nickel and chromium is in a range of from 0.1 to 0.5 cat.-%, and a ratio of the sum of the molar proportions of cations of sodium and potassium to the sum of the molar proportions of cations of nickel and chromium is in a range of from 70:1 to 200:1.

An additive manufacturing ink composition may include a fluid medium. The ink may further include a chalcogenide glass suspended within the fluid medium to form a chalcogenide glass mixture. The ink may also include a surfactant. A method for forming an additive manufacturing ink may include wet milling a chalcogenide glass in a fluid medium and a surfactant to produce a chalcogenide glass mixture. The method may also include, after wet milling the chalcogenide glass, processing the chalcogenide glass mixture to reduce an average particle size of the chalcogenide glass.

A device formation method may include printing a chalcogenide glass ink onto a surface to form a chalcogenide glass layer, where the chalcogenide glass ink comprises chalcogenide glass and a fluid medium. The method may further include sintering the chalcogenide glass layer at a first temperature for a first duration. The method may also include annealing the chalcogenide glass layer at a second temperature for a second duration. A device may include a substrate and a printed chalcogenide glass layer on the substrate, where the printed chalcogenide glass layer includes annealed chalcogenide glass, and where the printed chalcogenide glass layer is free from cracks.