Abstract: The present invention provides a carbon-containing refractory composition characterized by containing 0.1-10 parts by weight of silicon hexaboride in 100 parts by weight of refractory material comprising 3-95 parts by weight of carbonaceous material such as graphite and 97-5 parts by weight of refractory aggregate.In the carbon-containing refractory composition of the present invention, silicon hexaboride is oxidized producing boron oxide on the surface of the refractory at a high temperature during operation, and the surface of the refractory is covered by the formation of a highly viscous molten liquid like kotoite (3 MgO.B.sub.2 O.sub.3), for example, which is formed from the components of the refractory, such as MgO, for example, thus particles of carbonaceous material such as graphite can be protected from oxidation.

Abstract: A refractory for use in casting of molten metal which essentially comprises refractory material comprising corundum and monoclinic zirconia as principal mineral phase and including Al.sub.2 O.sub.3 and ZrO.sub.2, silicon-containing powder and carbon-containing powder and which optionally includes first additional refractory material comprising mullite, baddellite and corundum as principal mineral phase and including Al.sub.2 O.sub.3, ZrO.sub.2 and SiO.sub.2, one or more second additional refractory materials and/or alumina.

Abstract: There is disclosed a method for preparing a coated powder comprising the steps of adding a carbon powder and an aluminum nitride powder to a methylsilicic acid powder or a precursor of the methylsilicic acid and mixing them and then subjecting the resulting mixed powder to a heat treatment in an atmosphere including an inert gas or a carbon component-containing gas in order to coat the aluminum nitride powder with silicon carbide.This invention provides a chemically stable coated powder and a sintered body obtained by employing the coated powder has a good thermal conductivity.

Abstract: An improved alumina reduction cell is disclosed. Vapor barriers, formed from a castable refractory and a silicon carbide mortar protect the bottom and sidewall insulation material of the cell from attack by the corrosive materials contained within the cell.

Abstract: The invention concerns a fired refractory product based on refractory grains and binder, and process for the production thereof.The refractory product comprises a charge of refractory grains belonging to the group comprising carbonaceous products such as anthracite, natural graphite, artificial graphite, amorphous carbon, coke, refractory compounds known as RHM such as silicon carbide and refractory oxides such as alumina, corundum, magnesia, silica and chromium oxide, taken separately, in mixture or in combination; said grains are secured together by a cement based on a coked carbonaceous product and metal silicon in powder form; and the final proportion of metal silicon is from 1 to 15.8% and preferably from 3 to 10.5%.The product is intended for the manufacture of side linings for tanks for the production of aluminum by igneous electrolysis, and linings for blast furnaces and electric furnaces for electrometallurgy operations.

Abstract: An elemental carbon-containing refractory composition having superior erosion and oxidation resistance due to the addition of prescribed amounts of boron carbide.

Abstract: High alumina slide gate compositions comprising aluminous grain, carbonaceous material, high purity alumina, silicon metal and resin.

Abstract: Carbon in the form of graphite is commonly used in refractories for metallurgical purposes because of its ability to increase resistance to corrosion. However, if the graphite in the refractory becomes oxidized, it greatly loses this ability. For this reason, it is very important for a refractory to have good resistance to oxidation, but there are at present no refractories fully satisfactory from the standpoints of resistance to oxidation and hot strength.The present invention is a carbon-containing refractory having excellent resistance to oxidation and hot strength. These favorable properties are obtained by the addition in the refractory of both boron carbide and metal powder, the powder comprising at least one metal selected from Al, Si, Fe, and Ni.

Abstract: Flaky .beta.-SiC mainly composed of .beta.-SiC which is obtained from an organic silicon polymer containing the carbon and silicon atoms as the major skeletal component and the method for producing such flaky .beta.-SiC are disclosed. Such .beta.-SiC is especially utilized as the starting material for ceramics having a laminar structure as well as for the refractories. The ceramics and refractories provided with such .beta.-SiC have excellent resistance to thermal shock, to thermal fatigue as well as to oxidation.

Abstract: A more pressable composition for making graphitic refractory brick from oxide aggregate with a carbon bond is obtained when the refractory oxide aggregate is substantially all coarser than 0.15 mm (+100 mesh), preferably coarser than 0.2 mm (+65 mesh), and most preferably coarser than 0.4 mm (+35 mesh), and the matrix is entirely carbonaceous material, such as graphite, particularly flake graphite, resin, particularly a phenol formaldehyde resin, together with such other carbonaceous materials as carbon black, calcined coke, anthracite, and the like.

Abstract: The invention relates to the method for hot repairing various kinds of pig iron and steel making furnaces wherein a hot repairing material made in the state of slurry by adding 10-50 weight % water to a monolithic refractory comprising refractory and/or carbon-containing granulated particles and a binder is projected onto a worn part necessitating repairs in the high temperature furnace, the water in the projected hot repairing material boiling under the high heat in the furnace whereby said repairing material is not only fully mixed but also permitted to flow into the minutest recesses of the part necessitating repairs, said repairing material being hardened with the termination of the boiling thereby enabling to form in the worn part a fabricated body having high packing, strength and corrosion resistance.

Abstract: Carbon bonded refractory brick containing 1 to 6% by weight liquid thermosetting resin binder consisting of polyhydroxydiphenyl resin and a curing agent and the balance being refractory aggregate.

Abstract: A dry ramming refractory cement composed principally of coarse dense alumina grains, silicon metal powder, calcined alumina and sodium hexametaphosphate, and optionally one or more materials from the group including silicon carbide, fused white alumina, chromia, periclase, kyanite, graphite and cryolite.

Abstract: A particulate dispersion of Al.sub.2 O.sub.3, elemental non-diamond carbon and a titanium member selected from the group consisting of elemental titanium, TiH.sub.2 and mixtures thereof is formed into a compact and sintered producing a ceramic composite having a minimum Rockwell A hardness of about 92 and being comprised of an Al.sub.2 O.sub.3 phase and a substoichiometric titanium carbide phase.

Abstract: A refractory shape having improved resistance to erosion in metal melting vessels and high modulus of rupture, comprising an anhydrous refractory material, an anhydrous organic binder, from 0.3% to about 30% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 10% particulate elemental magnesium, based on the weight of the refractory shape. Addition of both elemental carbon and elemental magnesium results in a synergistic improvement in slag erosion resistance.

Abstract: An amorphous refractory settable at low temperatures comprises a usual refractory material, a metal powder in an amount of 0.5 to 5% by weight based on the whole amount of the refractory and serving as a sintering agent and a phosphate glass powder in an amount of 0.5 to 3% by weight based on the whole amount and serving as a sintering and setting agent. A pitch powder can be further incorporated in the refractory in an amount of 0.1 to 6% by weight based on the whole amount to render the refractory settable more effectively at low temperatures. The refractory is usable in the form of a dry powder without using any water or other liquid for lining troughs and containers for molten metals.

Abstract: Carbonaceous bonded refractory shapes in which the predominant refractory aggregate is andalusite, being characterized by the absence of substantial shrinkage after coking at 2000.degree. F.

Abstract: Flaky .beta.-SiC mainly composed of .beta.-SiC which is obtained from an organic silicon polymer containing the carbon and silicon atoms as the major skeletal component and the method for producing such flaky .beta.-SiC are disclosed. Such .beta.-SiC is especially utilized as the starting material for ceramics having a laminar structure as well as for the refractories. The ceramics and refractories provided with such .beta.-SiC have excellent resistance to thermal shock, to thermal fatigue as well as to oxidation.

Abstract: The invention relates to a method of preparing a product containing, as a single crystalline phase, a solid solution or .beta.'-sialon type having the general formula Si.sub.6-Z Al.sub.Z O.sub.Z N.sub.8-Z where Z=1 to 4, which comprises heating in a nitrogen atmosphere, at 1400.degree.-1600.degree. C., agglomerated elements obtained by drying a paste comprising a silico-aluminous material, such as kaolinitic clay, carbon, and a pore-generating agent comprised of fine particles of a ligneous material, such as sawdust or a powder of olive stones.

Abstract: A refractory for steel casting comprising, based on the total weight of the refractory in each case, 5-80% by weight of ZRM, 10-40% by weight of carbon powder, 0-20% by weight of one or more of SiC, Si.sub.3 N.sub.4, metallic silicon and ferrosilicon, 0-30% by weight of fused silica and 0-60% by weight of alumina powder containing at least 70% by weight of Al.sub.2 O.sub.3 based on the total weight of the alumina powder. The ZRM includes the main mineral phase consisting of mullite, baddeleyite and corundum and having the chemical composition consisting of 25-85% by weight of Al.sub.2 O.sub.3, 10-70% by weight of ZrO.sub.2 and 5-25% by weight of SiO.sub.2. A process for producing the refractory for steel casting.

Abstract: A tundish veneer composition comprising about 45-80 percent by weight of MgO, about 1-7 percent by weight of a refractory clay filler, about 1-15 percent by weight of a refractory glass wool fiber, about 3-10 percent of aqueous colloidal silica binder, and optionally, up to about 15 percent by weight of graphite, a foaming agent, or a dispersing agent.

Abstract: The invention relates to precluding the shortcomings intrinsic to the conventional unburned carbon-containing refractory bricks, i.e., oxidization under high temperature conditions and the incidental decarbonization, the phenomenon of exfoliation and detachment of the fragile layers, and more particularly to obtaining thereby unburned carbon-containing refractory bricks having the high properties by causing refractory brick material comprising substantially more than 1 weight % carbon to contain 1-10 weight % aluminum powder and/or magnesium powder each independently or in a mixture thereof, and/or 0.5-6 weight % silicon powder.

Abstract: Unshaped refractories are disclosed which have incorporated therein granules comprising fine powder refractory and carbonaceous material. The fine powder refractory may be the refractories of magnesia clinker, dolomite, magnesia-dolomite, high alumina, recovered materials of such refractories recovered after use, and mixtures of two or more thereof. The carbonaceous material may be any one of: thermosetting resin, a thermoplastic resin to which has been added pitch and hardening agent, other resins, or mixtures of two or more thereof.