Abstract: The present invention relates to a coating composition comprising a solid component comprising a clay and mica, wherein the clay comprises from about 50 to about 90% by weight of kaolinite and from about 5 to about 35% by weight of montmorillonite and the coating composition comprises, based on the solid component, from about 5 to about 50 parts by weight of clay. Furthermore, a process for coating a casting mold and the use of the coating composition for coating a casting mold are disclosed.

Abstract: The invention relates to a size composition (coating composition) for casting moulds and cores, comprising at least one metal additive which contains a metal or a compound of a metal, wherein the metal is selected from one of groups 7 or 9 to 12 of the Periodic Table of the Elements. The invention also relates to a process for producing a casting mould, which comprises a mould coating of the size (coating) according to the invention, and to the use of said mould for the casting of metals.

Abstract: The present invention relates to a coating and a method for producing a casting mold. The method provides for castings whereby gas defects are largely or completely suppressed.

Abstract: The invention relates to a casting mould for the casting of metals, wherein a layer consisting of a material which absorbs harmful substances on at least sections of gas outlet surfaces of the casting mold, in particular the top side thereof. The invention also relates to a coating composition, to a process for producing the casting mold and to the use thereof for casting of metals.

Abstract: The present invention relates to wash compositions which comprise a solvent component and a solids component wherein the solvent component comprises as main component water or one or more alcohols, and the solids component comprises as main component a mixture of metakaolinite and pyrophyllite, which can be applied onto casting molds, casting molds comprising these wash compositions and the use thereof, in particular in centrifugal casting processes and large-scale casting processes.

Abstract: The invention relates to a casting mould for the casting of metals, wherein a layer consisting of a material which absorbs harmful substances on at least sections of gas outlet surfaces of the casting mould, in particular the top side thereof. The invention also relates to a coating composition, to a process for producing the casting mould and to the use thereof for casting of metals.

Abstract: The invention relates to a size composition (coating composition) for casting moulds and cores, comprising at least one metal additive which contains a metal or a compound of a metal, wherein the metal is selected from one of groups 7 or 9 to 12 of the Periodic Table of the Elements. The invention also relates to a process for producing a casting mould, which comprises a mould coating of the size (coating) according to the invention, and to the use of said mould for the casting of metals.

Abstract: The present invention relates to a coating and a method for producing a casting mold. The method provides for castings whereby gas defects are largely or completely suppressed.

Abstract: The invention relates to a moulding mixture for producing casting moulds for metalworking, a process for producing casting moulds, casting moulds obtained by the process and also their use. To produce the casting moulds, a refractory mould raw material and a binder based on water glass are used. A proportion of a particulate metal oxide selected from the group consisting of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide is added to the binder. Particular preference is given to using synthetic amorphous silicon dioxide as metal oxide.

Abstract: The invention relates to a rheological additive comprising illite clay, smectic clay and an attapulgite suitable for controlling the application characteristics of a coating material for porous bodies.

Abstract: The invention relates to a wash which is suitable, in particular, for centrifugal casting. The wash comprises at least: a carrier liquid; at least one pulverant refractory material; at least one thickener; and a metallic nucleating agent which can initiate crystallization of the metal used for casting. The invention further relates to a process for producing a casting and a casting mold which comprises a mold coating produced from the wash of the invention.

Abstract: The disclosed invention relates to the field of ceramics and concerns an open-cell expanded ceramic which may be used in the form of a deep-bed filter, and a process for the production thereof. The primary object is to produce an open-cell expanded ceramic by a simple and economical process. This object is attained by an open-cell expanded ceramic in which the inner cavities, cracks and the porosity of the ceramic members are filled partially or completely by one or a plurality of metal and/or ceramic phases and/or glass phases. The open-cell expanded ceramic is also produced in that during or after sintering the cavities, cracks and the porosity of the ceramic members are partially or completely filled with a melt or a suspension which melt below the melting temperature of the expanded ceramic, have a coefficient of expansion similar to the coefficient of expansion of the expanded ceramic, and a very good wetting capacity, and only react partially or not at all with constituents of the expanded ceramic.

Abstract: Substantially dry, self-hardening, thermally activated refractory compositions, suitable for use to produce linings for furnaces or metallurgical vessels such as ladles, tundishes or launders, comprise particulate refractory material, an inorganic binder having associated therewith chemically or physically bound water such as sodium metasilicate pentahydrate or tribasic sodium phosphate dodecahydrate, and an element or compound, such as aluminium, which will react exothermically with the inorganic binder. The compositions may also contain an inhibitor such as a mineral oil or a vegetable oil to inhibit premature exothermic reaction.

Abstract: Filters for filtering molten light metals comprise a reticular foam formed from a composition comprising graphite, wollastonite, silica and a borosilicate glass and consist of a crystalline phase comprising graphite and wollastonite dispersed in a substantially amorphous matrix of borosilicate glass. The filters can readily be machined accurately from large pieces of the filter material, and they do not pick up moisture from the atmosphere when stored.

Abstract: Filters for filtering molten light metals comprise a reticular foam having a composition comprising graphite, wollastonite, silica and an alkali phosphate glass. The filters have a low hardness and can readily be machined accurately from large pieces of the filter material. In a preferred embodiment the exterior surfaces of the large pieces of filter are coated with a composition comprising graphite and a binder prior to firing and then machined.