Abstract: A sliding gate device includes a fixed plate fixed to a molten steel container, a sliding plate for opening/closing a nozzle hole, a sliding device moving a case holding the sliding plate, and a contact pressure control mechanism switching between a contact pressure applied state and a no-contact-pressure applied state for the fixed plate and the sliding plate. The contact pressure control mechanism has a support bar member moving relative to the fixed plate, a joining block tool switching between a joined state where the support bar member and the case cooperate with each other, and a joining-released state where the support bar member and the case do not cooperate with each other, and a spring member generating a force applying a contact pressure according to a position of the support bar member.

Abstract: A die casting sleeve, supported horizontally on a die casting device such that a cylinder portion front end communicates with a cavity and a plunger tip is inserted from a cylinder portion rear end, is configured such that the cylinder portion has a double structure in which an inner cylinder is fitted into an outer cylinder, the inner cylinder is made of a composite material of titanium or a titanium alloy and ceramic in at least a molten metal receiving region under an inlet port, a first planar portion is formed on the outer cylinder in the molten metal receiving region, and a cooling device including a tubular portion for letting a cooling medium flow in a jacket main body as a metal block having a second planar portion is mounted on the outer cylinder in a state where the second planar portion abuts against the first planar portion.

Abstract: A die casting sleeve, supported horizontally on a die casting device such that a cylinder portion front end communicates with a cavity and a plunger tip is inserted from a cylinder portion rear end, is configured such that the cylinder portion has a double structure in which an inner cylinder is fitted into an outer cylinder, the inner cylinder is made of a composite material of titanium or a titanium alloy and ceramic in at least a molten metal receiving region under an inlet port, a first planar portion is formed on the outer cylinder in the molten metal receiving region, and a cooling device including a tubular portion for letting a cooling medium flow in a jacket main body as a metal block having a second planar portion is mounted on the outer cylinder in a state where the second planar portion abuts against the first planar portion.

Abstract: A sliding gate device includes a fixed plate fixed to a molten steel container, a sliding plate for opening/closing a nozzle hole, a sliding device moving a case holding the sliding plate, and a contact pressure control mechanism switching between a contact pressure applied state and a no-contact-pressure applied state for the fixed plate and the sliding plate. The contact pressure control mechanism has a support bar member supported to move relative to the fixed plate, a joining block tool switching between a joined state where the support bar member and the case cooperate with each other by mounting the joining block tool therebetween, and a joining-released state where the support bar member and the case do not cooperate with each other by dismounting the joining block tool, and a spring member generating a force applying a contact pressure according to a position of the support bar member.

Abstract: Provided is a metal-based material having a high hardness. A metal-based composite material of the present invention is formed from a sintered body obtained from Ti material powder, Mo material powder, Ni material powder, and ceramics powder, and 0.1 to 9 parts by mass of Ni is contained with respect to 100 parts by mass of the entirety of the metal-based composite material.

Abstract: A chromia-based brick, having chromia as a main component, includes: 70 to 95 mass % of Cr2O3; 0.5 to 15 mass % of ZrO2; 0.4 to 4.0 mass % of P2O5 derived from phosphate added as raw material; 10 or lower mass % of Al2O3; and a sintering aid component and unavoidable components.

Abstract: An immersion-nozzle replacement apparatus includes a guide, and a pressing keyboard row. The guide supports two immersion nozzles, a foremost immersion nozzle and a rear immersion nozzle. The guide includes two rows supporting the immersion nozzles via the lower face in the flange. The pressing keyboard row, which is provided in the rows of the guide, includes first keyboards pressing the foremost immersion nozzle via the lower face in the flange. The immersion-nozzle replacement apparatus pushes out the foremost immersion nozzle horizontally with the rear immersion nozzle, and puts the rear immersion nozzle on the pressing keyboard rows. The guide further includes an additionally-pressing keyboard row following a rear end of the pressing keyboard rows, and including a second keyboard pressing the rear immersion nozzle via the lower face in the flange before pushing out the foremost immersion nozzle.

Abstract: [Object] Provided is a metal-based material having a high hardness. [Solution] A metal-based composite material of the present invention is formed from a sintered body obtained from Ti material powder, Mo material powder, Ni material powder, and ceramics powder, and 0.1 to 9 parts by mass of Ni is contained with respect to 100 parts by mass of the entirety of the metal-based composite material.

Abstract: A silicon carbide-natured refractory block includes a fire-resistant block body, and a calcination coated layer. The fire-resistant block body includes a silicon carbide-natured refractory having a predetermined configuration. The calcination coated layer includes silicon oxide made by heating an outer superficial portion of the fire-resistant block body to oxidize at least some of silicon carbide therein to turn the silicon carbide into the silicon oxide. The silicon oxide sinters the calcination coated layer to increase the corrosion resistance.

Abstract: A fired precast block prevents itself from dropping off early due to corrosion and increases service life of a blast furnace runner, etc. when used in a very vulnerable portion of the blast furnace runner, etc., and can be produced at low costs. The fired precast block has an upper surface to contact molten metal or slag, a lower surface opposing the upper surface, and a plurality of side surface. The fired precast block is used by being embedded in a castable in such a manner that the upper surface is exposed from the castable and the lower surface and the plurality of side surfaces contact the castable. Each side surface of at least one opposing pair of side surfaces includes a planar portion and an uneven portion. The uneven portion has at least one groove-shaped concave portion.

Abstract: An immersion-nozzle replacement apparatus includes a guide, and a pressing keyboard row. The guide supports two immersion nozzles, a foremost immersion nozzle and a rear immersion nozzle. The guide includes two rows supporting the immersion nozzles via the lower face in the flange. The pressing keyboard row, which is provided in the rows of the guide, includes first keyboards pressing the foremost immersion nozzle via the lower face in the flange. The immersion-nozzle replacement apparatus pushes out the foremost immersion nozzle horizontally with the rear immersion nozzle, and puts the rear immersion nozzle on the pressing keyboard rows. The guide further includes an additionally-pressing keyboard row following a rear end of the pressing keyboard rows, and including a second keyboard pressing the rear immersion nozzle via the lower face in the flange before pushing out the foremost immersion nozzle.

Abstract: An electronic circuit of the present invention includes: a circuit board on which an electronic component is mounted; a heat conducting sheet stacked on the electronic component; and a heat sink stacked on the heat conducting sheet. The heat sink includes a porous ceramics having a volume resistivity of 1010 Ohm·cm or more and a porosity of 15-50 vol %.

Abstract: A circular columnar body made of ceramics and including a plurality of through-holes extending in a single axial direction Z and having circular or elliptical cross sectional shapes orthogonal to the axial direction at a density of 2 to 50 pieces per square inch in a cross section orthogonal to the axial direction is once hollowed out in a direction X orthogonal to the axial direction Z by a cylinder, and the circular columnar body can also be once again hollowed out in the direction orthogonal to the axial direction Z and the direction X by the cylinder.

Abstract: There is provided a heat collector for solar thermal power generation that suppresses oxidization using a silicon-carbide ceramic sintered body as a base body. The heat collector includes the base body made of a silicon-carbide ceramic sintered body in which channels (cells) for passing through a heat medium are formed, a first glass layer of silicate glass that coats at least a part of surfaces of the base body and contains an alkali metal constituent and/or an alkaline-earth metal constituent, and a second glass layer of silicate glass that coats the first glass layer and has a sum of contents of an alkali metal constituent and an alkaline-earth metal constituent, which is smaller than a sum of contents of the alkali metal constituent and the alkaline-earth metal constituent in the first glass layer.

Abstract: A container for heat treatment of a positive-electrode active material for a lithium-ion battery to the present invention is characterized by having a base portion containing 60 to 95 mass % of alumina, and a surface portion containing 20 to 80 mass % of spinel and formed integrally with the base portion. Moreover, a production method of the present invention is characterized by comprising a step of placing an alumina-based powder, a step of placing a spinel-based powder above the alumina-based powder, a step of forming a compact by compressing the powders and a step of firing the compact.

Abstract: A fired precast block prevents itself from dropping off early due to corrosion and increases service life of a blast furnace runner, etc. when used in a very vulnerable portion of the blast furnace runner, etc., and can be produced at low costs. The fired precast block has an upper surface to contact molten metal or slag, a lower surface opposing the upper surface, and a plurality of side surface. The fired precast block is used by being embedded in a castable in such a manner that the upper surface is exposed from the castable and the lower surface and the plurality of side surfaces contact the castable. Each side surface of at least one opposing pair of side surfaces includes a planar portion and an uneven portion. The uneven portion has at least one groove-shaped concave portion.

Abstract: A silicon carbide-natured refractory block includes a fire-resistant block body, and a calcination coated layer. The fire-resistant block body includes a silicon carbide-natured refractory having a predetermined configuration. The calcination coated layer includes silicon oxide made by heating an outer superficial portion of the fire-resistant block body to oxidize at least some of silicon carbide therein to turn the silicon carbide into the silicon oxide. The silicon oxide sinters the calcination coated layer to increase the corrosion resistance.

Abstract: There is provided a heat collector for solar thermal power generation that suppresses oxidization using a silicon-carbide ceramic sintered body as a base body. The heat collector includes the base body made of a silicon-carbide ceramic sintered body in which channels (cells) for passing through a heat medium are formed, a first glass layer of silicate glass that coats at least a part of surfaces of the base body and contains an alkali metal constituent and/or an alkaline-earth metal constituent, and a second glass layer of silicate glass that coats the first glass layer and has a sum of contents of an alkali metal constituent and an alkaline-earth metal constituent, which is smaller than a sum of contents of the alkali metal constituent and the alkaline-earth metal constituent in the first glass layer.

Abstract: Provided is a manufacturing method of a recycled plate for a sliding nozzle, which is capable of repairing damage of a plate used for a sliding nozzle to extend an endurance period and widens a range of the used plate as a target for recycling. The manufacturing method of the recycled plate performs, on a plate used for the sliding nozzle, recycling processing including impregnating a matrix of the plate that is formed by a refractory brick with liquid containing at least one of tar and pitch, heating the plate impregnated with the liquid to remove a volatile component, grinding a surface of the plate after having been impregnated with the liquid and heated, and bonding a plate material to one surface of the plate after having been grinded.