Abstract: A copper alloy powder is a copper alloy powder for additive manufacturing. The copper alloy powder contains more than 1.00 mass % and not more than 2.80 mass % of chromium, and a balance of copper. A method for producing an additively-manufactured article includes a first step of preparing a copper alloy powder containing more than 1.00 mass % and not more than 2.80 mass % of chromium and a balance of copper and a second step of producing the additively-manufactured article from the copper alloy powder, and the additively-manufactured article is produced such that forming a powder layer including the copper alloy powder, and solidifying the copper alloy powder at a predetermined position in the powder layer to form a shaped layer are sequentially repeated to stack such shaped layers to thus produce the additively-manufactured article.

Abstract: A composition capable of forming a heat-dissipation member having high thermal conductivity, and a heat-dissipation member. The composition for the heat-dissipation member of the present application contains a polymerizable liquid crystal compound having, at both terminals, a structure including an oxiranyl group or an oxetanyl group; a curing agent that cures the polymerizable liquid crystal compound; and an inorganic filler formed of nitride. A curing temperature of the composition for the heat-dissipation member is within or higher than the temperature range in which the polymerizable liquid crystal compound exhibits a liquid crystal phase, and within or lower than the temperature range in which the polymerizable liquid crystal compound exhibits an isotropic phase. The heat-dissipation member formed of such a composition can have excellent thermal conductivity owing to a synergistic effect between alignment of the liquid crystal compound and the inorganic filler formed of nitride.

Abstract: An objective of the present invention is to provide an organic-inorganic hybrid acrylic polymer having an increased refractive index, which has a higher transparency and a less impaired scratch resistance; a metal oxide dispersion and a polymerizable composition as materials for the polymer; and the organic-inorganic hybrid polymer capable of being produced in a crack-free manner. Another objective of the present invention is to provide a high-performance antireflection film using the organic-inorganic hybrid polymer. The metal oxide dispersion of the present invention comprises a phosphorus compound represented by Formula (1): (wherein, R1 is a hydrogen atom, an alkyl group, an alkynyl group, an alkenyl group, an aryl group, an aliphatic heterocyclic group, or an aromatic heterocyclic group; R2 is an organic residue; and n is 1 or 2) and a metal oxide.

Abstract: The present invention relates to a method for preparing a continuous carbon fiber-reinforced thermoplastic prepreg, and more specifically, to a method for preparing a continuous carbon fiber-reinforced thermoplastic semi-prepreg or prepreg, comprising the steps of: providing a plurality of carbon fibers having an increased width; preparing a layered product by arranging a thermoplastic film on at least a part of the upper and lower portions of the carbon fibers having an increased width; and preparing a joined product by joining the thermoplastic film and the carbon fibers comprising the layered body.

Abstract: A steel pipe pile and a steel pipe column is connected using a steel pipe socket. The connection method may include preparing the steel pipe socket including a socket supporting portion that covers an upper end surface of the steel pipe pile, and inserting a plurality of socket insertion portions extended downward from the socket supporting portion and having a plurality of socket grooves at a lower end portion thereof and a plurality of fastening members installed on the socket supporting portion. The method may also include inserting the socket grooves of the steel pipe socket into an upper end portion of the steel pipe pile and mounting the steel pipe column on the socket supporting portion. The method may further include fastening the steel pipe column and the steel pipe pile using the plurality of fastening members of the socket supporting portion.

Abstract: Disclosed is a boron recovering device including: an aeration-type water-channel reactor including a water channel; at least one aeration unit disposed in the water channel and aerating a boron-containing solution by passing it through the water channel to deposit boron in the form of borax; and a precipitation bath precipitating the deposited borax in the boron-containing solution having passed through the aeration-type water-channel reactor and separating a filtrate by overflowing, a boron recovering device, a method of recovering boron, and a boron recovering system.

Abstract: Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula Fe?C?Si?BxPyCrz, wherein ?, ?, ?, x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein ? is expressed by ?=100?(?+?+x+y+z) atomic %, ? is expressed by 13.5 atomic %???17.8 atomic %, ? is expressed by 0.30 atomic %???1.50 atomic %, x is expressed by 0.1 atomic %?x?4.0 atomic %, y is expressed by 0.8 atomic %?y?7.7 atomic %, and z is expressed by 0.1 atomic %?z?3.0 atomic %.

Abstract: The present invention relates to an aluminum-magnesium coated steel plate using vacuum coating, wherein an aluminum-magnesium coating layer is constituted by 1 to 45 wt % of magnesium, a balance of aluminum, and other inevitable impurities, and an Al3Mg2 alloy phase is formed in the aluminum-magnesium coating layer by performing heat treatment of the steel plate.

Abstract: The present invention relates to a method of manufacturing lithium hydroxide and a method of manufacturing lithium carbonate using the same. The method of manufacturing lithium hydroxide includes: preparation of a lithium phosphate aqueous solution including lithium phosphate particles; addition of a phosphate anion precipitation agent to the lithium phosphate aqueous solution; and precipitating a sparingly soluble phosphate compound through a reaction of cations of the phosphate anion precipitation agent with anions of the lithium phosphate.

Abstract: The present invention relates to a cathode current collector for a solid oxide fuel cell and, more particularly, to a cathode current collector inserted between a cell and a metal separator constituting a unit of a fuel cell stack, and a solid oxide fuel cell comprising the same.

Abstract: An exemplary embodiment of the present invention provides a coated steel sheet on which a magnesium-aluminum alloy coating layer is formed, including: a steel sheet; and a coating layer configured to include a first magnesium-aluminum alloy layer formed on a top surface of the steel sheet and a second magnesium-aluminum alloy layer formed on a top surface of the first magnesium-aluminum alloy layer, wherein a magnesium content of the first magnesium-aluminum alloy layer is higher than that of the second magnesium-aluminum alloy layer.

Abstract: The present invention provides a method for preparing dialkyl carbonate from urea or alkyl carbamate and alkyl alcohol using an ionic liquid comprising a cation, which produces a hydrogen ion, and a hydrophobic anion containing fluorine with high temperature stability in the presence of catalyst containing a metal oxide or hydrotalcite. Since the present invention can prepare dialkyl carbonate at a pressure lower than those of existing methods, it does not require an expensive pressure control device and peripheral devices for maintaining high pressure including the installation cost. It is also the method for preparing a dialkyl carbonate with high yield, thus improving economical efficiency. Moreover, the method of the present invention hardly produces any waste during the process and is thus an eco-friendly method.

Abstract: Disclosed is a method for preparing a dialkyl carbonate, in which a dialkyl carbonate such as dimethyl carbonate is economically prepared in an environmentally-friendly manner at a higher yield while reducing generation of a by-product. The method for preparing the dialkyl carbonate includes reacting urea, an alkyl carbamate having 1 to 3 carbon atoms, or a mixture thereof with a monovalent alcohol having 1 to 3 carbon atoms in the presence of a room temperature ionic liquid and a catalyst including a salt of a transition metal or a rare earth metal.

Abstract: Provided is a method of amplification of coke oven gas (COG) through reacting high-temperature carbon with carbon dioxide and/or water using waste heat generated in a coke oven. More particularly, a method of amplification of COG including providing a gasification agent including carbon dioxide, water, or a mixture thereof to a COG stream in a carburization chamber of a coke oven and gasifying carbon by allowing the gasification agent to react with carbon in the carburization chamber, and a coke oven apparatus suitable for the method are provided.

Abstract: Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula Fe?C?Si?BxPyCrz, wherein ?, ?, ?, x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein ? is expressed by ?=100?(?+?+x+y+z) atomic %, ? is expressed by 13.5 atomic %???17.8 atomic %, ? is expressed by 0.30 atomic %???1.50 atomic %, x is expressed by 0.1 atomic %?x?4.0 atomic %, y is expressed by 0.8 atomic %?y?7.7 atomic %, and z is expressed by 0.1 atomic %?z?3.0 atomic %.

Abstract: The present invention relates to a method for preparing a continuous carbon fiber-reinforced thermoplastic prepreg, and more specifically, to a method for preparing a continuous carbon fiber-reinforced thermoplastic semi-prepreg or prepreg, comprising the steps of: providing a plurality of carbon fibers having an increased width; preparing a layered product by arranging a thermoplastic film on at least a part of the upper and lower portions of the carbon fibers having an increased width; and preparing a joined product by joining the thermoplastic film and the carbon fibers comprising the layered body.

Abstract: The present invention relates to hard coating layer and a method for forming the hard coating layer. A method for forming hard coating layer which comprises: washing a substrate; installing the washed substrate in a vacuum equipment, and vacuating the chamber of the vacuum equipment; cleaning the substrate; forming oblique coating layer on the substrate; and forming vertical coating layer, vertically to the substrate, on the oblique coating layer by applying bias-voltage after forming oblique coating layer is provided. According to present invention, hardness of coating layer may be enhanced by forming a oblique coating layer and vertical coating layer on a substrate.

Abstract: A method of manufacturing iron-based powder includes providing an iron-based molten steel manufactured through a iron making process and a steelmaking process to a tundish; and performing water atomization over the molten steel discharged through a nozzle connected to the tundish. The iron-based powder is manufactured from the molten steel refined after a molten iron tapped from a iron making process is charged into a converter without a pre-treatment process of the molten iron, thus economically providing the highly clean iron-based powder.

Abstract: A magnesium alloy with dense surface texture and its surface treatment method, and more particularly to a magnesium alloy and its surface treatment method, where the magnesium alloy includes: a parent material including magnesium or magnesium alloy; a surface-modified layer being formed on the surface of the parent material and containing Si; and a coating layer formed on the surface-modified layer, where the surface-modified layer comprises a “—Si—O—Mg—” structure.

Abstract: Disclosed is a method of extracting lithium from a solution including lithium. The method of extracting lithium from a solution including lithium includes: separating the solution including lithium into a monovalent ion-containing solution and a solution including ions having more than divalence using a separation membrane having a negative charge on its surface; removing impurities from the monovalent ion-containing solution; and precipitating lithium dissolved in the monovalent ion-containing solution into lithium phosphate by adding a phosphorus-supplying material to the monovalent ion-containing solution.