Abstract: This ring-shaped disk for a gas turbine includes a ring-shaped disk material consisting of a Ni-based alloy, wherein the Ni-based alloy has a composition that includes, in terms of percent by mass, Ni: 50.00 to 55.00%, Cr: 17.0 to 21.0%, Nb: 4.75 to 5.60%, Mo: 2.8 to 3.3%, Ti: 0.65 to 1.15%, Al: 0.20 to 0.80%, and C: 0.01 to 0.08%, with the balance being Fe and inevitable impurities, and has a microstructure in which ? phase particles are distributed in a matrix thereof, and wherein, in the microstructure, flattened ? phase particles of which maximum length directions are oriented at angles within a range of 60 to 120° with respect to a radial direction of the ring-shaped disk material are present in an amount of 60% or more of a total amount of the ? phase particles distributed in the matrix.

Abstract: This ring-shaped disk for a gas turbine includes a ring-shaped disk material consisting of a Ni-based alloy, wherein the Ni-based alloy has a composition that includes, in terms of percent by mass, Ni: 50.00 to 55.00%, Cr: 17.0 to 21.0%, Nb: 4.75 to 5.60%, Mo: 2.8 to 3.3%, Ti: 0.65 to 1.15%, Al: 0.20 to 0.80%, and C: 0.01 to 0.08%, with the balance being Fe and inevitable impurities, and has a microstructure in which ? phase particles are distributed in a matrix thereof, and wherein, in the microstructure, flattened ? phase particles of which maximum length directions are oriented at angles within a range of 60 to 120° with respect to a radial direction of the ring-shaped disk material are present in an amount of 60% or more of a total amount of the ? phase particles distributed in the matrix.

Abstract: A fin and a tube for a high-temperature heat exchanger are made of a nickel-based alloy which contains 2.0 to 5.0% of Al and further contains, as required, at least one selected from the group consisting of 0.1 to 2.5% of Si, 0.8 to 4.0% of Cr, and 0.1 to 1.5% of Mn, the balance being Ni and unavoidable impurities.

Abstract: At least one of a center electrode and a ground electrode of an engine spark plug is a Ni-base alloy containing, in weight percentage, 0.5˜2.5% Si, 0.1˜1.2% Mn, 3.2˜5.0% Al, 0.9˜2.8% Cr, 0.001˜0.025% C in addition to Ni and unavoidable impurities. And, a value S/V is in a range from 1.7 mm−1 to 3.9 mm−1 when ‘S’ represents a surface area of the ground electrode and ‘V’ represents a volume of the ground electrode.

Abstract: A mold for producing a silicon ingot having a layered structure comprising an inner silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a fine fused silica sand with a particle size of 100-300 &mgr;m is bonded with a silica binder, and an outer silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a coarse fused silica sand with a particle size of 500-1500 &mgr;m is bonded with a silica binder.

Abstract: A fin and a tube for a high-temperature heat exchanger are made of a nickel-based alloy which contains 2.0 to 5.0% of Al and further contains, as required, at least one selected from the group consisting of 0.1 to 2.5% of Si, 0.8 to 4.0% of Cr, and 0.1 to 1.5% of Mn, the balance being Ni and unavoidable impurities.

Abstract: At least one of a center electrode and a ground electrode of an engine spark plug is a Ni-base alloy containing, in weight percentage, 0.5˜2.5% Si, 0.1˜1.2% Mn, 3.2˜5.0% Al, 0.9˜2.8% Cr, 0.001˜0.025% C in addition to Ni and unavoidable impurities. And, a value S/V is in a range from 1.7 mm−1 to 3.9 mm−1 when ‘S’ represents a surface area of the ground electrode and ‘V’ represents a volume of the ground electrode.

Abstract: A method for producing a silicon ingot having a directional solidification structure comprising the steps of: placing a silicon raw material into a crucible of a melting device constructed by mounting a chill plate on an underfloor heater, mounting a crucible with a large cross-sectional area on the chill plate, providing an overhead heater over the crucible, and surrounding the circumference of the crucible with a heat insulator; heat-melting the silicon raw material by flowing an electric current through the underfloor heater and overhead heater; chilling the bottom of the crucible by halting the electric current through the underfloor heater after the silicon raw material has been completely melted to form a molten silicon; chilling the bottom of the crucible by flowing an inert gas through the chill plate; and intermittently or continuously lowering the temperature of the overhead heater by intermittently or continuously decreasing the electric current through the overhead heater, and an apparatus for pro

Abstract: A mold for producing a silicon ingot having a layered structure comprising an inner silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a fine fused silica sand with a particle size of 100-300 &mgr;m is bonded with a silica binder, and an outer silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a coarse fused silica sand with a particle size of 500-1500 &mgr;m is bonded with a silica binder.

Abstract: A mold for producing a silicon ingot having a layered structure comprising an inner silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a fine fused silica sand with a particle size of 100-300 &mgr;m is bonded with a silica binder, and an outer silica layer containing at least one layer in which a fused silica powder with a particle size of 100 &mgr;m or less and a coarse fused silica sand with a particle size of 500-1500 &mgr;m is bonded with a silica binder.

Abstract: An Ni-base heat resistant alloy, has a composition which contains, by weight, Cr: from 12.0 to 14.3%, Co: from 8.5 to 11.0%, Mo: from 1.0 to 3.5%, W: from 3.5 to 6.2%, Ta: from 3.0 to 5.5%, Al: from 3.5 to 4.5%, Ti: from 2.0 to 3.2%, C: from 0.04 to 0.12%, B: from 0.005 to 0.05%, and the balance substantially Ni and inevitable impurities. A large-size casting, as well as a large-size turbine blade, having a columnar crystalline Ni-base heat-resistant alloy formed from the Ni-base heat-resistant alloy, have sound cast surfaces and a sound internal structure.

Abstract: A method for producing a silicon ingot having a directional solidification structure comprising the steps of: placing a silicon raw material into a crucible of a melting device constructed by mounting a chill plate on an underfloor heater, mounting a crucible with a large cross-sectional area on the chill plate, providing an overhead heater over the crucible, and surrounding the circumference of the crucible with a heat insulator; heat-melting the silicon raw material by flowing an electric current through the underfloor heater and overhead heater; chilling the bottom of the crucible by halting the electric current through the underfloor heater after the silicon raw material has been completely melted to form a molten silicon; chilling the bottom of the crucible by flowing an inert gas through the chill plate; and intermittently or continuously lowering the temperature of the overhead heater by intermittently or continuously decreasing the electric current through the overhead heater, and an apparatus for pro

Abstract: An Ni-base heat resistant alloy, has a composition which contains, by weight, Cr: from 12.0 to 14.3%, Co: from 8.5 to 11.0%, Mo: from 1.0 to 3.5%, W: from 3.5 to 6.2%, Ta: from 3.0 to 5.5%, Al: from 3.5 to 4.5%, Ti: from 2.0 to 3.2%, C: from 0.04 to 0.12%, B: from 0.005 to 0.05%, and the balance substantially Ni and inevitable impurities. A large-size casting, as well as a large-size turbine blade, having a columnar crystalline Ni-base heat-resistant alloy formed from the Ni-base heat-resistant alloy, have sound cast surfaces and a sound internal structure.

Abstract: A casting furnace for forming a large size turbine blade at a high casting rate using a casting alloy which has a single crystal structure or a columnar crystal structure, includes a main tank 2 in which a mold M is placed. A heater 6 heats the periphery of a mold M to a predetermined temperature. The heater is then vertically raised relative to the mold M while a cooling liquid metal immerses and cools the periphery of the heated mold M below the heater. The surface height of the cooling liquid metal is raised according to the rising of the heater.

Abstract: A corrosion-resistant amorphous alloy containing Ta in an amount of from 10 to 40 atomic % and Mo, Cr, W, P, B and/or Si is disclosed.This alloy can be prepared by rapidly cooling and solidifying molten alloy, shows a satisfactory corrosion resistance in high-temperature concentrated phosphoric acid, and is adapted to be used as a plant structural material or a separator for a fuel cell.

Abstract: The present invention relates to a superior Fe--Cr alloy and a nozzle for diesel engines formed from this Fe--Cr alloy. The Fe--Cr alloy of the present invention comprises:______________________________________ C: 0.1.about.0.2% by weight Si: 0.1.about.2% by weight Mn: 0.1.about.2% by weight Cr: 16.about.20% by weight Mo: 1.1.about.2.4% by weight Nb: 0.3.about.2.1% by weight Ta: 0.1.about.2.2% by weight N: 0.02.about.0.15% by weight ______________________________________with a remaining portion therein consisting of Fe and unavoidable impurities. It is possible to substitute a portion of the Fe using 0.2.about.2.5% by weight of Co. Furthermore, in this case, it is also possible to substitute a portion of the Fe using at least one element selected from among 0.2.about.2.5% by weight of Ni and 0.2.about.2.5% by weight of W.

Abstract: A rotating blade or stationary vane of a gas turbine which is made of a nickel alloy containing Cr, Co, Mo, W, Ta, Al, Ti, C, B, Zr, and one or both of Mg and Ca. Additionally, the alloy may contain Hf, Pt, Rh and Re.

Abstract: A coated valve face of an engine valve is formed of an Fe-based alloy having a composition consisting essentially of, by weight, 0.7 to 1.5% of C, 10 to 15% of Mn, 24 to 30% of Cr, 6.1 to 9.8% of Mo, 10 to 15% of Ni, 0.1 to 0.4% of N, 0.2 to 1.5% of Si, and optionally at least one of 0.1 to 5% of Nb, 0.1 to 5% of Ta and 0.15% of W as required (the total content of Nb, Ta and W being limited to 5% or less), and the balance substantially Fe and inevitable impurities, and having a two-phase structure formed of an austenitic phase and an eutectic carbide phase. In another embodiment, the composition contains between 0.05 to 1% Co. The Fe-based alloys are preferably applied to the valve face by plasma beam or laser beam coating of powdered such alloys onto the valve face.

Abstract: The improved nickel-base heat-resistant alloy consists of 13.1-15.0% Cr (all percentages that follows are by weight), 8.5-10.5% Co, 1.0-3.5% Mo, 3.5-4.5% W, 3.0-5.5% Ta, 3.5-4.5% Al, 2.2-3.2% Ti, 0.06-0.12% C, 0.005-0.025% B, 0.010-0.05% Zr and 1-100 ppm of Mg and/or Ca, in the optional presence of 0-1.5% Hf and/or 0-0.5% of at least one element of Pt, Rh and Re, with the remainder being Ni and incidental impurities. The alloy has high strength and high resistance to oxidation and corrosion at elevated temperatures and, hence, is suitable for use as a constituent material for machine parts that are to be exposed to elevated temperatures.

Abstract: A Co-based alloy exhibits superior high-temperature strength and resistance properties. In one embodiment, the Co-based alloy contains, in weight percent, from about 0.1 to about 1.2 of C; from about 0.01 to about 2 of at least one of Si and Mn; from about 22 to about 37 of Cr; from about 5 to about 15 of Ni; from about 0.1 to about 3.5 of Re; with a balance being Co and incidental impurities. Co and C, Si, Mn, Cr, Ni, Re, B, Zr, W, Mo, Ta, and Nb impart high-temperature wear resistance to the alloy to withstand repeated temperature cycling in a glass spinnaret. In one embodiment of the present invention, Hf is added to improve molten glass corrosion resistance, while Y and other rare earth elements are added in alternate embodiments to improve high-temperature oxidation resistance. Percentages by weight are disclosed for enhanced high-temperature oxidation resistance, increased fluid wear resistance and enhanced molten glass corrosion resistance.