To provide An Al.sub.2O.sub.3-free dental lithium silicate glass composition comprising the following components: SiO.sub.2: 60.0 to 80.0% by weight Li.sub.2O: 10.0 to 17.0% by weight K.sub.2O: 0.5 to 10.0% by weight a nucleating agent: 1.0 to 6.0% by weight a colorant: 0.0 to 10.0% by weight, and, a metal oxide Me(tetravalent)O.sub.2: 5.0 to 10.0% by weight.

Provided is a method for producing a glass substrate that can reduce the dimensional change during heat treatment while avoiding shortening of facilities' service lives. A method for producing a glass substrate includes melting and forming a glass raw material to produce a glass substrate having a strain point of 690 to 750° C., wherein an average cooling rate in a temperature range from (an annealing point plus 150° C.) to (the annealing point minus 200° C.) in a cooling process during the forming is adjusted to 100 to 400° C./min to obtain the glass substrate having a degree of thermal contraction of 15 ppm or less when subjected to a heat treatment at 500° C. for an hour.

The present invention provides a method of one step ion exchange for functionalization thin glasses by strengthening and controlling the optical properties. Owing to controllable optical transmittance and absorbance properties, these thin glasses can be utilized as solar control glasses. A paste containing potassium compound and silver compound was applied to the glass substrate containing an alkali metal component by screen printing, thereafter ion exchange heat treatment was performed below glass transition temperature. The method of the invention can produce a glass with surface compressive stress between 550 and 600 MPa, compressive stress layer in the range of 10-15 μm. In the antimicrobial activity test, the amount of alive E. coli bacteria decreased ≥99.9% after 24 hours of contact time. Thin glasses, in which the optical transmittance values are controlled depending on the ion exchange process conditions, spectrally selective, chemically strengthened and showing antimicrobial surface properties that are in accordance with the requirements of the application area, were produced by one step ion exchange.

The present invention relates to a glass ceramic having improved thermal expansion characteristics and to the use thereof in a precision component.

The present invention relates to a glass ceramic having improved thermal expansion characteristics and to the use thereof in a precision component.

Alkali aluminosilicate glasses that may be ion exchanged to achieve ultra-high peak compressive stress. The glasses may be ion exchanged to achieve a peak compressive stress of at least about 1000 MPa and up to about 1500 MPa. The high peak compressive stress provides high strength for glasses with shallow flaw size distributions. These glasses have high Young's moduli, which correspond to high fracture toughness and improved failure strength and are suitable for high-strength cover glass applications that experience significant bending stresses in use such as, for example, as cover glass in flexible displays.

An apparatus for manufacturing a glass article includes a plurality of side portions spaced apart from each other; and a plurality of heat supply portions disposed on each of the side portions; where the side portions adjacent to each other are disposed to face each other, and a glass is allowed to be disposed between the adjacent side portions.

Annealing treatments for modified titania-silica glasses and the glasses produced by the annealing treatments. The annealing treatments include an isothermal hold that facilitates equalization of non-uniformities in fictive temperature caused by non-uniformities in modifier concentration in the glasses. The annealing treatments may also include heating the glass to a higher temperature following the isothermal hold and holding the glass at that temperature for several hours. Glasses produced by the annealing treatments exhibit high spatial uniformity of CTE, CTE slope, and fictive temperature, including in the presence of a spatially non-uniform concentration of modifier.

The invention discloses porous, bioactive glass and glass ceramic morsels or pellets to be used as tissue graft substitute materials and processes for obtaining the same wherein the bioactive glass and glass ceramic morsels or pellets are made up of natural agents like phosphate, calcium, sodium and other elements which are not alien to the human or animal body. The said preparation process encompasses various steps like quenching sintering, foaming, and sol-gel casting which render the glass morsels or pellets unique bioactivity and enhanced porosity which may facilitate tissue repair and augmentation during tissue graft replacement.

A material including a transparent substrate coated with a stack of thin layers including at least one silver-based functional metallic layer and at least one zinc-based metallic layer. The zinc-based metallic layer is located above or below a silver-based functional metallic layer and separated from this silver-based functional metallic layer by at least one intermediate oxide layer based on one or more elements chosen from zinc, titanium, zirconium, tin, niobium, magnesium, hafnium and nickel.