Abstract: Provided is a thermoelectric module including electrodes and P-type and N-type semiconductors formed on a substrate by a printing method. The thermoelectric module includes upper and lower substrates (110 and 120) formed of ceramic or aluminum and forming upper and lower surfaces of the thermoelectric module; electrodes (130) disposed on surfaces of the upper and lower substrates (110 and 120), the electrodes being formed of an electrically conductive material for transmitting electric power; a plurality of P-type and N-type semiconductors (140 and 150) spaced between the electrodes (130), the P-type and N-type semiconductors (140 and 150) being forming by sintering a paste mixture of thermoelectric powder and an organic solvent, wherein the electrodes (130) and the P-type and N-type semiconductors (140 and 150) are formed by a printing method. With this configuration, thin thermoelectric module having various sizes and shapes can be provided.

Abstract: Provided is a thermoelectric module including electrodes and P-type and N-type semiconductors formed on a substrate by a printing method. The thermoelectric module includes upper and lower substrates (110 and 120) formed of ceramic or aluminum and forming upper and lower surfaces of the thermoelectric module; electrodes (130) disposed on surfaces of the upper and lower substrates (110 and 120), the electrodes being formed of an electrically conductive material for transmitting electric power; a plurality of P-type and N-type semiconductors (140 and 150) spaced between the electrodes (130), the P-type and N-type semiconductors (140 and 150) being forming by sintering a paste mixture of thermoelectric powder and an organic solvent, wherein the electrodes (130) and the P-type and N-type semiconductors (140 and 150) are formed by a printing method. With this configuration, thin thermoelectric module having various sizes and shapes can be provided.

Abstract: A fabrication method of thermoelectric materials using core-shell structured nano-particles and thermoelectric materials fabricated by the same are provided. The method includes preparing core-shell structured nano-particles having thermoelectric elements coated on the surface thereof (step 1); adding and mixing the prepared core-shell structured nano-particles of step 1, bismuth (Bi) salts, tellurium (Te) salts and a surfactant in a solvent (step 2); adding and dispersing a reducing agent in the mixture of step (step 3); and heating the mixture of step 3 in which reducing agent is added and dispersed (step 4). According to the present invention, thermoelectric materials, nano-phase is homogeneously dispersed inside of thermoelectric grain boundary, can be fabricated and if the fabricated materials are used after sintering and bulking, the thermoelectric materials are maintained in a state that the nano-particles remain in dispersed phase even after sintering.

Abstract: The thermoelectric material according to the present invention is characterized in that carbon nanotubes are dispersed in thermoelectric matrix powder by mechanically grinding, mixing, and treating by heating a mixed powder formed through a chemical reaction after mixing a first solution in which carbon nanotubes are dispersed and a second solution containing metallic salts. Further, a method for fabricating the thermoelectric material includes fabricating the first solution and the second solution, mixing the first solution and the second solution with each other to form a mixed solution, forming and growing a mixed powder in which carbon nanotubes and metals are mixed by a chemical reaction of the mixed solution, mechanically grinding and mixing the mixed powder, and heating the ground-and-mixed mixed powder to form the thermoelectric material.

Abstract: Disclosed is a method of manufacturing a super hard alloy containing carbon nanotubes, including (a) forming a carbon nanotube-metal composite from carbon nanotubes and metal powder, (b) mixing the carbon nanotube-metal composite obtained in (a) with hard-phase powder, (c) molding the powder mixture obtained in (b), and (d) sintering the molded body obtained in (c). In the method of the invention, the reaction between carbon nanotubes and transition metal carbide in the super hard alloy is minimized, thus maximizing an increase in toughness by virtue of the addition of carbon nanotubes, thereby obtaining the super hard alloy having both high hardness and high toughness. The super hard alloy containing carbon nanotubes manufactured using the method of the invention has high hardness and high toughness, and thus can be effectively utilized in cutting tools, molds, wear-resistant members, heat-resistant structural materials, etc.

Abstract: A fabrication method of thermoelectric materials using core-shell structured nano-particles and thermoelectric materials fabricated by the same are provided. The method includes preparing core-shell structured nano-particles having thermoelectric elements coated on the surface thereof (step 1); adding and mixing the prepared core-shell structured nano-particles of step 1, bismuth (Bi) salts, tellurium (Te) salts and a surfactant in a solvent (step 2); adding and dispersing a reducing agent in the mixture of step (step 3); and heating the mixture of step 3 in which reducing agent is added and dispersed (step 4). According to the present invention, thermoelectric materials, nano-phase is homogeneously dispersed inside of thermoelectric grain boundary, can be fabricated and if the fabricated materials are used after sintering and bulking, the thermoelectric materials are maintained in a state that the nano-particles remain in dispersed phase even after sintering.

Abstract: The thermoelectric material according to the present invention is characterized in that carbon nanotubes are dispersed in thermoelectric matrix powder by mechanically grinding, mixing, and treating by heating a mixed powder formed through a chemical reaction after mixing a first solution in which carbon nanotubes are dispersed and a second solution containing metallic salts. Further, a method for fabricating the thermoelectric material includes fabricating the first solution and the second solution, mixing the first solution and the second solution with each other to form a mixed solution, forming and growing a mixed powder in which carbon nanotubes and metals are mixed by a chemical reaction of the mixed solution, mechanically grinding and mixing the mixed powder, and heating the ground-and-mixed mixed powder to form the thermoelectric material.

Abstract: Provided is a thermoelectric module including electrodes and P-type and N-type semiconductors formed on a substrate by a printing method. The thermoelectric module includes upper and lower substrates (110 and 120) formed of ceramic or aluminum and forming upper and lower surfaces of the thermoelectric module; electrodes (130) disposed on surfaces of the upper and lower substrates (110 and 120), the electrodes being formed of an electrically conductive material for transmitting electric power; a plurality of P-type and N-type semiconductors (140 and 150) spaced between the electrodes (130), the P-type and N-type semiconductors (140 and 150) being forming by sintering a paste mixture of thermoelectric powder and an organic solvent, wherein the electrodes (130) and the P-type and N-type semiconductors (140 and 150) are formed by a printing method. With this configuration, thin thermoelectric module having various sizes and shapes can be provided.

Abstract: Nanophase WC powder is produced by preparing a precursor including tungsten; producing gas by vaporizing or sublimating the precursor; carbonizing the gas in the atmosphere without oxygen while maintaining pressure below atmospheric pressure; and condensing the carbonized gas

Abstract: The present invention relates to a method of producing nanophase powder, which can be used as materials for high-strength and wear-resistance cemented carbide. It purports to provide a method of producing WC powder of a 10˜20 nm grade by using vapor phase reaction with a precursor containing tungsten. For achieving said objectives, the method of producing WC-based powder according to the present invention comprises preparing a precursor containing tungsten; producing gas by vaporizing said precursor in a reactor; and carburizing said gas in a non-oxidizing atmosphere. The nanophase WC powder produced as such has high-strength and excellent wear-resistance, which can be suitably used as materials for carbide tools, carbide cement, wear-resistance components, or metal molds.

Abstract: Nanophase WC powder is produced by preparing a precursor including tungsten; producing gas by vaporizing or sublimating the precursor; carbonizing the gas in the atmosphere without oxygen while maintaining pressure below atmospheric pressure; and condensing the carbonized gas

Abstract: The present invention relates to a method of producing nanophase powder, which can be used as materials for high-strength and wear-resistance cemented carbide. It purports to provide a method of producing WC powder of a 10˜20 nm grade by using vapor phase reaction with a precursor containing tungsten. For achieving said objectives, the method of producing WC-based powder according to the present invention comprises preparing a precursor containing tungsten; producing gas by vaporizing said precursor in a reactor; and carburizing said gas in a non-oxidizing atmosphere. The nanophase WC powder produced as such has high-strength and excellent wear-resistance, which can be suitably used as materials for carbide tools, carbide cement, wear-resistance components, or metal molds.

Abstract: The present invention relates to a method of adding a grain growth inhibitor of WC/Co cemented carbide, which comprises adding a water-soluble salt of V, Ta, or Cr component as a grain growth inhibitor, at the time of mixing water-soluble salts of W and Co during the initial production process of WC/Co cemented carbides. As a result, the present invention leads to the production of powder of homogeneous distribution of grain growth inhibitors, which in turn results in the enhancement of the mechanical properties thereof by effectively controlling the abnormal growth of WC during sintering in the production process of said cemented carbides.

Abstract: The present invention relates to a method of adding a grain growth inhibitor of WC/Co cemented carbide, which comprises adding a water-soluble salt of V, Ta, or Cr component as a grain growth inhibitor, at the time of mixing water-soluble salts of W and Co during the initial production process of WC/Co cemented carbides. As a result, the present invention leads to the production of powder of homogeneous distribution of grain growth inhibitors, which in turn results in the enhancement of the mechanical properties thereof by effectively controlling the abnormal growth of WC during sintering in the production process of said cemented carbides.

Abstract: The present invention relates to a method of producing nanophase WC/TiC/Co composite powder by means of a mechano-chemical process comprising a combination of mechanical and chemical methods. For this purpose, the present invention provides a method of producing nanophase WC/TiC/Co composite powder, said method comprising as follows: a process of producing an initial powder by means of spray-drying from water-soluble salts containing W, Ti, and Co; a process of heating to remove the salts and moisture contained in the initial powder after spray-drying; a process of mechanically ball-milling to grind oxide powder after removing the salts and moisture therefrom, and to homogeneously mix the powder with an addition of carbon; and a process of heating the powder after milling, for reduction and carburization, in an atmosphere of reductive gas or non-oxidative gas.

Abstract: A mechanochemical process for producing fine WC/Co composite powder which is so small in WC grain size and in mean free path, and contains such a uniform distribution of WC and Co that its hard metal is superior in strength, compressive strength, TRS and wear resistance and considerably free of impurities. The method comprises the steps of drying an ammonium metatungstate--Co(NO.sub.3).sub.2 solution in a spray dry manner to give initial powder of porous spheroids or in a common manner to give a cake of initial powder, removing the salts and humidity from the initial powder by a thermal treatment, mixing and milling the desalted initial powder with carbon black, and subjecting the mixed powder to reduction/carburization in a reactor.

Abstract: A method for producing high density and ultrafine W/Cu bulk material by a mechano-chemical process is disclosed. In the method of this invention, metal salts as start materials are spray-dried and prepare W--Cu precursor powder having uniformly-dispersed tungsten and copper components. The W--Cu precursor powder in turn is subjected to a desalting and milling process, thus preparing W--Cu oxide composite powder. Thereafter, the W--Cu oxide composite powder may be formed into a formed green body prior to reducing and sintering under hydrogen atmosphere.