Embodiments of glass articles exhibiting a grey or a green tint are described. In one or more embodiments, the glass article comprises a glass composition including SiO.sub.2, Al.sub.2O.sub.3 B.sub.2O.sub.3 or MgO, a non-zero amount of alkali metal oxides (R.sub.2O), R.sub.2OAl.sub.2O.sub.3 in the range from about 0.5 to about 1.5; and up to 1 mol % Fe.sub.2O.sub.3. In one or more embodiments, the glass composition includes a ratio of R.sub.2O to Al.sub.2O.sub.3 equal to or greater than about 1, Na.sub.2O, from 0-13 mol % MgO, at least one of K.sub.2O, SnO.sub.2 and TiO.sub.2. Laminates including such glass articles and methods of making the glass articles are also described.

Embodiments of glass articles exhibiting a grey or a green tint are described. In one or more embodiments, the glass article comprises a glass composition including SiO.sub.2, Al.sub.2O.sub.3 B.sub.2O.sub.3 or MgO, a non-zero amount of alkali metal oxides (R.sub.2O), R.sub.2OAl.sub.2O.sub.3 in the range from about 0.5 to about 1.5; and up to 1 mol % Fe.sub.2O.sub.3. In one or more embodiments, the glass composition includes a ratio of R.sub.2O to Al.sub.2O.sub.3 equal to or greater than about 1, Na.sub.2O, from 0-13 mol % MgO, at least one of K.sub.2O, SnO.sub.2 and TiO.sub.2. Laminates including such glass articles and methods of making the glass articles are also described.

A method of processing cathode ray tube (CRT) glass with waste glass into a pozzolanic mixture includes, receiving CRT glass aggregate, pulverizing the CRT glass aggregate forming an intermediate CRT glass product, fine grinding the intermediate CRT glass product into a powder, receiving waste glass, pulverizing the waste glass forming an intermediate waste glass product, fine grinding the intermediate waste glass product into a waste glass powder, and combining the waste glass powder with the CRT glass powder by weight or volume to form the pozzolanic mixture. The pozzolanic mixture may be used in place of Portland cement in a cementitious mixture. Also, a leaded portion of the CRT glass may be used in the cementitious mixture to act as a radiation barrier.

A transparent article made of glass ceramic with high surface quality as well as a method producing are provided. The article is suitable for use as a viewing pane. The method includes the steps of: producing a melt with a raw material composition that is suitable for a ceramization; hot shaping a flat substrate made of ceramizable green glass having two oppositely arranged, essentially flat surfaces from the melt; processing of at least one of the surfaces of the substrate with a smoothing fine-treatment process; ceramizing the substrate to produce the article made of glass ceramic.

A method for coating a composite structure, comprising applying a first slurry onto a surface of the composite structure, wherein the first slurry is a sol gel comprising a metal organic salt, a first carrier fluid, and a ceramic material, and heating the composite structure to a first sol gel temperature sufficient to form a sol gel-derived base layer on the composite structure.

The application relates to bond materials for a grinding wheel, in particular a glass ceramic and a preparation method thereof, and a bond for the composite grinding wheel. The glass ceramic is prepared from raw materials comprising kaolin, silica, diboron trioxide, lithium superoxide, albite, potassium feldspar, talc, dolomite, phosphorus pentoxide, and yttrium oxide. A glass ceramic composed entirely of microcrystalline phases is obtained from the glass prepared by the above raw materials at 900-1020 C., achieving a complete conversion of the glass phase at a low temperature. The application also provides a bond for a composite grinding wheel, comprising glass ceramic and glass with mass ratio of (20-50):(50-80), the glass phase having a low flow temperature and, together with the glass ceramic phase, forming encapsulation of the abrasive particles, realizing low-temperature sintering of the grinding wheel. Microcrystalline phase in the bond results in high mechanical strength for the obtained grinding wheel.

In one method for producing opaque quartz glass, a green body is produced from a slip containing fine, amorphous SiO.sub.2 particles and coarse SiO.sub.2 reinforcement bodies and the green body is sintered by way of a sintering treatment into a blank made from the opaque quartz glass. The reinforcement bodies with a specific density D.sub.K1 are here embedded in a SiO.sub.2 matrix with a specific glass density D.sub.M. Starting from this, in order to provide a blank of opaque quartz glass that is less susceptible to cracking and illustrates homogeneous transmission even in the case of small wall thicknesses, in one aspect sinterable reinforcement bodies are used, the specific density D.sub.K0 of which prior to the sintering treatment is lower than the specific glass density D.sub.M, and which due to the sintering treatment reach the specific density D.sub.K1 which differs from the specific glass density D.sub.M by less than 10%.

A process and apparatus for manufacturing glass. A mixture of solid glass-forming materials comprising at least one fining agent are introduced into a doghouse located upstream of an elongated tank. The glass-forming materials are melted in the doghouse at a temperature at or above a fining-onset temperature of the at least one fining agent by application of heat from one or more submerged combustion burners. The resulting molten glass is relatively foamy and may comprise greater than 25 vol. % gas bubbles. The molten glass is directed from the doghouse into an upstream end of the tank where it is refined to produce molten glass having on average less than 20 seeds per ounce.

A method for forming a laminated glass article may include flowing a molten first glass composition having a first R.sub.2O concentration and a first fining agent with a first fining agent concentration. The method may also include flowing a molten second glass composition having a second R.sub.2O concentration less than the first R.sub.2O concentration of the first glass composition and a second fining agent with a second fining agent concentration that is greater than or equal to the first fining agent concentration of the first glass composition. The molten first glass composition may be contacted with the molten second glass composition to form an interface between the molten first glass composition and the molten second glass composition.

The coated glass sheet of the present invention includes: a glass sheet; and a coating film provided on at least one principal surface of the glass sheet and having a smooth surface. The coating film includes: isolated closed pores present within the coating film; and a matrix. The coating film is substantially free of open pores open at the surface of the coating film. For the coated glass sheet of the present invention, a transmittance gain is 2.5% or more, the transmittance gain being calculated by subtracting an average transmittance of the glass sheet as determined by applying light having wavelengths of 380 to 1100 nm to the glass sheet in the absence of the coating film on the surface of the glass sheet from an average transmittance of the coated glass sheet as determined by applying light having the wavelengths to the coated glass sheet from a side on which the coating film lies.