An oriented alumina substrate for epitaxial growth according to an embodiment of the present invention includes crystalline grains constituting a surface thereof, the crystalline grains having a tilt angle of 1 or more and 3 or less and an average sintered grain size of 20 m or more.

An oriented alumina substrate for epitaxial growth according to an embodiment of the present invention includes crystalline grains constituting a surface thereof, the crystalline grains having a tilt angle of 0.1 or more and less than 1.0 and an average sintered grain size of 10 m or more.

The invention relates to a fused cast refractory material based on aluminium oxide, zirconium dioxide and silicon dioxide, and a use of such a material.

Disclosed herein are formed ceramic substrates comprising an oxide ceramic material, wherein the formed ceramic substrate comprises a low elemental alkali metal content, such as less than about 1000 ppm. Also disclosed are composite bodies comprising at least one catalyst and a formed ceramic substrate comprising an oxide ceramic material, wherein the composite body has a low elemental alkali metal content, such as less than about 1000 ppm, and methods for preparing the same.

The present disclosure relates to an electrolytic cell for the production of aluminium by reducing alumina. The cell may comprise a sidewall including at least one side block. The side block may comprise an aluminous material having an apparent porosity of less than about 10% and a composition, as a weight percentage on the basis of the aluminous material and for a total of about 100%, such that: Al2O3>about 50%, beta-alumina being less than about 20% of the weight of the aluminous material, oxides that are less reducible than alumina at 1000 C.<about 50%, Na2O<about 3.9%, and other components<about 5%.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

A high zirconia electrically fused cast refractory having long time durability with less cracking during production and in the course of temperature rising, excellent in productivity, less forming zircon crystals in the refractory itself and even in contact with molten glass, excellent in bubble foamability to molten glass, less generating cracks even undergoing heat cycles during operation of a glass melting furnace. A high zirconia electrically fused cast refractory comprises, as chemical component, 85 to 95% by weight of ZrO.sub.2, 0.4 to 2.5% by weight of Al.sub.2O.sub.3, 3.5 to 10.0% by weight of SiO.sub.2, 0.05% by weight or more of Na.sub.2O, 0.05 to 0.7% by weight of Na.sub.2O and K.sub.2O in total, 0.01 to 0.04% by weight of B.sub.2O.sub.3, 0.1 to 3.0% by weight of SrO or BaO when one of BaO and SrO is contained, 0.1% by weight or more of SrO and 0.1 to 3.0% by weight of SrO and BaO in total when both of BaO and SrO are contained, 0.01 to 0.2% by weight of CaO, 0.1% by weight or less of MgO, 0.01 to 0.7% by weight of SnO.sub.2, 0.3% by weight or less of Fe.sub.2O.sub.3 and TiO.sub.2 in total, less than 0.01% by weight of P.sub.2O.sub.5, and less than 0.01% by weight of CuO.

A fused-cast refractory product including, as mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO.sub.2+HfO.sub.2: remainder to 100%, with HfO.sub.25%; SiO.sub.2: 1.5% to 7.5%; Al.sub.2O.sub.3: 1.0% to 3.0%; CaO+SrO: 1.2% to 3.0%; Y.sub.2O.sub.3: 1.5% to 3.0%; Na.sub.2O+K.sub.2O: <0.15%; B.sub.2O.sub.3: <1.0%; P.sub.2O.sub.5: <0.15%; Fe.sub.2O.sub.3+TiO.sub.2: <0.55%; oxide species other than ZrO.sub.2, HfO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, B.sub.2O.sub.3, CaO, SrO, Y.sub.2O.sub.3, P.sub.2O.sub.5, Fe.sub.2O.sub.3 and TiO.sub.2: <1.5%.

The present invention relates to a carbonaceous material having a nitrogen element content, measured by element analysis, of 1.0% by mass or more, and a phosphorus element content, measured by X-ray fluorescence analysis, of 0.5% by mass or more.

The invention relates to a composition (batch) for producing a shaped refractory ceramic product, a method for producing a shaped refractory ceramic product, and a shaped refractory ceramic product.