Abstract:
The invention relates to a mixture containing an alkali-activated aluminosilicate binder, said mixture, after hardening, containing at least 25% by weight of glass beads, based on the total mass. The hardened product has a surface which has very little tendency to soil and is easy to clean. A process for the preparation of the mixture according to the invention and the use thereof as joint filler are disclosed.
Abstract:
The invention provides a vessel for molten metal comprising a vessel body formed of an alumina-silica-based material, and a protective layer formed of a silicon nitride- alumina-based material provided on the inner surface of the vessel body, wherein the material for the vessel body is adjusted to have an alumina content x of 72 to 95 parts by weight per 100 total parts by weight of alumina and silica, and the material for the protective layer is adjusted to have a silicon nitride content y per 100 total parts by weight of silicon nitride and alumina in such a manner that y applies to the following formulae: (1) y −0.5x+62.5. The present invention provides a vessel for molten metal having excellent durability and corrosion resistance against hot molten metal.
Abstract:
A variety of methods and compositions are disclosed, including, in one embodiment, a method of treating a well comprising: providing a treatment fluid comprising a base fluid and a blended cementitious component, wherein the blended cementitious component comprises kiln dust from two or more different sources; and introducing the treatment fluid into a well bore.
Abstract:
This invention pertains to a method for remediating, detoxifying and containing various types of asbestos fibers and asbestos containing materials, such as crocidolite (and other forms of Riebeckite), and tremolite. The end-product of the method may be reclaimed or recycled as useable surfacing, structural and decorative materials. In some embodiments of the invention some end-products of the process may be used as a synthetic gemstone, counter-surfacing material cutting tool, resin for manufacture of furniture products, while others may be used to reclaim natural sand. In one embodiment of this invention crocidolite or other forms of reibeckite or tremolite asbestos debris in loose form or as a component of asbestos cement or other asbestos containing products is converted to a form of engineered quartz, yielding as a synthetic form of the gemstone Tiger's Eye or Hawk's eye. This end-product bears unique and enhanced aesthetic qualities over other types of engineered quartz, called chatoyancy (an optical effect that arises either from the fibrous structure of a material or from fibrous inclusions or cavities and is sometimes likened to the sheen off a spool of silk). The end product therefore achieves luminous more natural-looking effect, while retaining the other desirable features of engineered quartz, such as strength, imperviousness to heat, and resistance to acids and microbial contamination, and reduces the need for the addition of decorative resinous materials which diminish the endurance features of the material.
Abstract:
The invention relates to an unshaped refractory material comprising a refractory base component and a binder component, the binder component comprising, related to the refractory material, an acidic component of the group comprising an acid, salt of an acid, ester of an acid, salt and ester of an acid as phosphate, sulfate or carbonate, in an amount of ≧1.5 wt.-% and ≦6 wt.-%, and a basic component of the group comprising: base, urotropin, calcium oxide, calcium hydroxide, magnesium oxide, caustic MgO, sodium hydroxide, potassium hydroxide, magnesium hydroxide, in an amount of ≧1 wt.-% and ≦4 wt.-%, wherein said material receives an earth-moist, crumbly consistency by addition of 1 to 5 wt.-% of water and which solidifies after an exothermic reaction of the binder component.
Abstract:
A synthetic microsphere having a low alkali metal oxide content and methods of forming the microsphere and its components are provided. The synthetic microsphere is substantially chemically inert and thus a suitable replacement for natural cenospheres, particularly in caustic environments such as cementitious mixtures. The synthetic microsphere can be made from an agglomerate precursor that includes an aluminosilicate material, such as fly ash, a blowing agent such as sugar, carbon black, and silicon carbide, and a binding agent. The synthetic microsphere is produced when the precursor is fired at a pre-determined temperature profile so as to form either solid or hollow synthetic microspheres depending on the processing conditions and/or components used.
Abstract:
The invention relates to an unshaped refractory material, to a process for producing an earth-moist, unshaped refractory material, and also to the use of the unshaped refractory material.
Abstract:
A mat material includes inorganic fibers, a first surface, and a second surface opposite to the first surface. The mat material has plural needle traces formed by performing a needling treatment. The needle traces extend from the first surface toward the second surface and from the second surface toward the first surface. There is no depth in the mat material that the needle traces do not reach. There is substantially no protrusion of a bundle of the inorganic fibers at a position on the second surface that lies on a line extending from each of the needle traces extending from the first surface. There is substantially no protrusion of a bundle of the inorganic fibers at a position on the first surface that lies on a line extending from each of the needle traces extending from the second surface.
Abstract:
Dispersion powders stabilized include a protective colloid. The protective colloid includes at least one polyvinyl alcohol having a Höppler viscosity μ1 of not more than 3 mPas and at least one polyvinyl alcohol having a Höppler viscosity μ2 of from 4 mPas to 25 mPas. The weighted Höppler viscosity μw of the protective colloid is not more than 6 mPas.
Abstract:
A composite material (10) formed of a ceramic matrix composite (CMC) material (12) protected by a ceramic insulating material (14). The constituent parts of the insulating material are selected to avoid degradation of the CMC material when the two layers are co-processed. The CMC material is processed to a predetermined state of shrinkage before wet insulating material is applied against the CMC material. The two materials are then co-fired together, with the relative amount of shrinkage between the two materials during the firing step being affected by the amount of pre-shrinkage of the CMC material during the bisque firing step. The shrinkage of the two materials during the co-firing step may be matched to minimize shrinkage stresses, or a predetermined amount of prestress between the materials may be achieved. An aluminum hydroxyl chloride binder material (24) may be used in the insulating material in order to avoid degradation of the fabric (28) of the CMC material during the co-firing step.