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 ceramic slate with a colored jade effect and a preparation method comprising: pressing and forming raw materials containing a ceramic base material and colored glass fragments to obtain a ceramic green body; drying and firing the ceramic green body to give a ceramic slate with colored jade effect particles dispersed on the surface of the green body; wherein, the colored glass fragments account for 3 wt % to 5 wt % of the ceramic base material. Since colored glass waste instead of frits and pigments is used to prepare the ceramic slate with the colored jade effect, the ceramic slate does not have the phenomenon of pigment dispersion after high-temperature firing, and the surface of the fired ceramic slate shows a shape of micro-protrusion, so that the polished tile surface is smoother and free from pits, resulting in a better tile surface effect.

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. Doped SiOC and SiC materials for providing semiconductor properties to SiC wafers, including p- and n-type properties.

A precast refractory block for a coke oven having high hot strength and stable under-load expansion/shrinkage behavior at high temperatures. Specifically, a silica-based precast refractory block contains a P.sub.2O.sub.5 component in an amount of 0.3 to 2.0 mass %.

A solid oxide fuel cell includes a cathode including a complex oxide having a perovskite structure expressed by the formula ABO.sub.3, an anode, and a solid electrolyte layer disposed between the cathode and the anode. The cathode includes phosphorus, chromium and boron, a content amount of the phosphorus in the cathode is at least 10 ppm and no more than 50 ppm, a content amount of the chromium in the cathode is at least 50 ppm and no more than 500 ppm, and a content amount of the boron in the cathode is at least 5 ppm and no more than 50 ppm.

A method for producing a transparent alumina sintered body according to the present invention includes (a) a step of preparing an alumina raw material powder containing a plate-like alumina powder having an aspect ratio of 3 or more and a fine alumina powder having an average particle diameter smaller than that of the plate-like alumina powder so that, when a mixing ratio of the plate-like alumina powder to the fine alumina powder in terms of mass ratio is assumed to be T:(100T), T is 0.001 or more and less than 1, and so that a mass ratio R1 of F relative to A1 in the alumina raw material powder is less than 15 ppm; (b) a step of forming a raw material for forming containing the alumina raw material powder into a compact; and (c) a step of sintering the compact so as to obtain a transparent alumina sintered body.

A silicon carbide-graphite composite is described, including (i) interior bulk graphite material and (ii) exterior silicon carbide matrix material, wherein the interior bulk graphite material and exterior silicon carbide matrix material inter-penetrate one another at an interfacial region therebetween, and wherein graphite is present in inclusions in the exterior silicon carbide matrix material. Such material may be formed by contacting a precursor graphite article with silicon monoxide (SiO) gas under chemical reaction conditions that are effective to convert an exterior portion of the precursor graphite article to a silicon carbide matrix material in which graphite is present in inclusions therein, and wherein the silicon carbide matrix material and interior bulk graphite material interpenetrate one another at an interfacial region therebetween. Such silicon carbide-graphite composite is usefully employed in applications such as implant hard masks in manufacturing solar cells or other optical, optoelectronic, photonic, semiconductor and microelectronic products, as well as in ion implantation system materials, components, and assemblies, such as beam line assemblies, beam steering lenses, ionization chamber liners, beam stops, and ion source chambers.

A solid oxide fuel cell includes a cathode, and an anode, and a solid electrolyte layer disposed between the cathode and the anode. The cathode includes a complex oxide having a perovskite structure expressed by the general formula ABO.sub.3. A standard deviation value for the atomic percentage of respective elements at the A site measured using energy dispersive X-ray spectroscopy at 10 spots in a single field on the sectional surface of the cathode is no more than 10.4.

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.

The invention provides a cathode active material for use in a rechargeable battery, comprising a coated lithium nickel oxide powder or a coated lithium nickel manganese oxide powder, the powder being composed of primary particles provided with a glassy lithium silicate surface coating. A method for preparing the cathode active material comprises the steps of: providing a lithium transition metal based oxide powder, providing an alkali mineral compound comprising a Li.sub.2xSiO.sub.30.5x compound, wherein 0<x<2, mixing the lithium transition metal based oxide powder and the alkali mineral compound to form a powder-mineral compound mixture, and heat treating the mixture at a temperature T whereby lithium is extracted from the surface of the metal based oxide powder to react with the alkali mineral compound, and a glassy surface coating is formed comprising a Li.sub.2xSiO.sub.30.5x compound, wherein x<x<2.