A formulation usable to produce plates and shaped bodies has a base slip, quartz glass particles and multicomponent glass particles that are crystallizable or at least partly crystallized. The base slip contains water as dispersion medium with a content between 30% and 50% by weight and ultrafine SiO.sub.2 particles distributed, preferably colloidally therein, with a proportion between 50% and 70% by weight. The proportion of quartz glass particles in the formulation is in the range from 40% to 70% by weight and the proportion the multicomponent glass particles in the formulation is in the range from 5% to 37% by weight. The formulation can be used in a composite material. Firing aids can be made from the composite material.

A formulation usable to produce plates and shaped bodies has a base slip, quartz glass particles and multicomponent glass particles that are crystallizable or at least partly crystallized. The base slip contains water as dispersion medium with a content between 30% and 50% by weight and ultrafine SiO.sub.2 particles distributed, preferably colloidally therein, with a proportion between 50% and 70% by weight. The proportion of quartz glass particles in the formulation is in the range from 40% to 70% by weight and the proportion the multicomponent glass particles in the formulation is in the range from 5% to 37% by weight. The formulation can be used in a composite material. Firing aids can be made from the composite material.

A continuous sol-gel process for producing silicate-containing glasses and glass ceramics is proposed, comprising the following steps: (a) continuously feeding a silicon tetraalkoxide, a silicon alkoxide with at least one non-alcoholic functional group and an alcohol into a first reactor (R1), and at least partially hydrolyzing by the addition of a mineral acid to obtain a first product stream (A); (b) continuously providing a second product stream (B) in a second reactor (R2) by feeding a metal alkoxide component or continuously mixing an alcohol and a metal alkoxide component; (c) continuously mixing product streams (A) and (B) in a third reactor (R3) for producing a presol to obtain a third product stream (C); (d) continuously adding water or a diluted acid to the product stream (C) to obtain a sol (gelation); (e) continuously filling the emerging sol into molds to obtain an aquagel; (f) drying the aquagels to obtain xerogels; (g) sintering the xerogels to obtain silicate-containing glasses and glass ceramics.

A glass container and related methods of manufacturing and coating glass containers. An exterior glass surface of a glass container is coated with a hybrid sol-gel and heated to cross-link the hybrid sol-gel. The resulting cross-linked hybrid sol-gel coating on the exterior glass surface of the glass container has greater than 90% silicate-based material by weight.

A process includes the formation of a colored glass layer on a glass substrate by flame pyrolysis of a solution including at least one precursor of a cobalt, iron, manganese, chromium, silver, copper, gold or selenium oxide, alone or as a mixture of several of them. Moreover, a glass substrate is coated with a layer of colored glass obtained by such a process.

The invention relates to a method for producing a glass coating on a substrate, comprising the following steps: applying a liquid sol to at least one surface of the substrate, allowing the sol to react to form a gel, and briefly treating the gel on the at least one surface outside a furnace in the presence of water vapour at a temperature of at least 700 C. The method according to the invention makes the coated surface dirt-repellent, electrically insulating, non-combustible, easy to clean and resistant to ageing, corrosion and chemicals. A particular advantage of the method according to the invention is that it can be carried out outside a furnace and nevertheless makes glass coatings possible.

A method for vitrifying waste to prevent the formation of molybdate secondary phases includes forming a feed mixture that includes the waste, a source of vanadium, and at least one of glass frit or glass forming chemicals and vitrifying the feed mixture in a melter to produce a glass product that includes the waste.

A dried glass precursor gel and methods of depositing a powderized or wire form of the dried glass precursor gel to form a glass substrate and/or coating are disclosed. The dried glass precursor gel contains a bulk amorphous oxide-based matrix of primary constituent oxides. One method includes obtaining the dried glass precursor gel, forming a powder or wire from the dried glass precursor gel, melting the powder with a gas stream to form molten droplets, and depositing the molten droplets onto a mold or similar target substrate.

A method of making a glass-ceramic article includes synthesizing a feedstock gel that includes a base oxide network comprising Na.sub.2O, CaO, and SiO.sub.2, in which a molar ratio of Na.sub.2O:CaO:SiO.sub.2 in the gel is 1:2:3, and then converting the feedstock gel into a glass-ceramic article such as a container or a partially-formed container. The conversion of the feedstock gel into a glass-ceramic container may be performed at a temperature that does not exceed 900 C. and may include the steps of pressing the feedstock gel into a compressed solid green-body, sintering the green-body into a solid monolithic body of a glass-ceramic material, deforming the solid monolithic glass-ceramic body into a glass-ceramic preform, and cooling the preform. A glass-ceramic article having a glass-ceramic material that has a molar ratio of Na.sub.2O:CaO:SiO.sub.2 that is 1:2:3 is also disclosed.

The present invention provides a composite shaped body comprising silica nanoparticles and an organic polymer, wherein the silica nanoparticles and the organic polymer form a three-dimensional network; thereby provides: a composite shaped body which exhibits excellent formability and fabricability and which is also suited for use, for example, in producing a silica glass provided with an electrical conductivity; and a silica glass (especially, an electrically conductive silica glass) obtained by firing the composite shaped body.