Abstract: A method for manufacturing carbon fiber reinforced aluminum composites is provided. Particularly, the method uses a stir casting process during a melting and casting process and reduces a contact angle of carbon against aluminum by inputting carbon fibers while supplying a current to liquid aluminum to induce the carbon fibers to be spontaneously and uniformly distributed in the liquid aluminum and inhibits a formation of an aluminum carbide (Al4C3) phase on an interface between the aluminum and the carbon fiber, thereby manufacturing carbon fiber reinforced aluminum composites having excellent electrical, thermal and mechanical characteristics.

Abstract: A method for manufacturing carbon fiber reinforced aluminum composites is provided. Particularly, the method uses a stir casting process during a melting and casting process and reduces a contact angle of carbon against aluminum by inputting carbon fibers while supplying a current to liquid aluminum to induce the carbon fibers to be spontaneously and uniformly distributed in the liquid aluminum and inhibits a formation of an aluminum carbide (Al4C3) phase on an interface between the aluminum and the carbon fiber, thereby manufacturing carbon fiber reinforced aluminum composites having excellent electrical, thermal and mechanical characteristics.

Abstract: The embodiments of the invention relate to a MoSi2-SiC nanocomposite coating layer formed on surfaces of refractory metals such as Mo, Nb, Ta, W and their alloys. The MoSi2-SiC nanocomposite coating layer is manufactured by forming a molybdenum carbide (MoC and MoC2) coating layers on the surfaces of the substrates at high temperature, and the subsequent vapor-deposition of Si. The MoSi2-SiC nanocomposite coating layer has a microstructure in which SiC particles are mostly located on the equiaxed MoSi2 grain boundary. The MoSi2-SiC nanocomposite coating layer can have a close thermal expansion coefficient to that of the substrate by controlling a volume fraction of SiC particles exisiting in the nanocomposite coating.

Abstract: An electrode pattern for a solid oxide fuel cell (SOFC) comprises a plurality of micro-sized first electrode patterns formed on an upper surface of a substrate including an electrolyte layer, and a plurality of micro-sized second electrode patterns formed between the first electrode patterns. The electrode pattern is formed by using a mold fabricated by a photoresist process. In order to form the electrode pattern, a paste for an electrode including a thermo-setting resin and an electrode powder is prepared. The electrode having a micro-sized or sub-micro sized width and a high precision is simply fabricated, and a miniaturized SOFC having a high function is fabricated.

Abstract: A NbSi2-base nanocomposite coating formed on the surface of niobium or niobium-base alloys is disclosed. The nanocomposite coating layer is manufactured by forming a niobium carbide layers or a niobium nitride layers by depositing of carbon or nitrogen on the surface, and then depositing silicon. The nanocomposite coating layer has a microstructure that SiC or Si3N4 particles are mostly precipitated on an equiaxed NbSi2 grain boundary. The thermal expansion coefficients of NbSi2-base nanocomposite coating layers become close to that of the substrates by adjusting the volume fraction of SiC or Si3N4 particles in the nanocomposite coating layers. Accordingly, the generation of cracks caused by thermal stress due to the mismatch in thermal expansion coefficient between the NbSi2-base nanocomposite coatings and the substrates can be suppressed, thereby improving the high-temperature oxidation resistance in the repeated thermal cycling use of the NbSi2-base nanocomposite coated substrates.

Abstract: Disclosed are the MoSi2—SiC nanocomposite coating layer formed on surfaces of refractory metals such as Mo, Nb, Ta, W and their alloys. The MoSi2—SiC nanocomposite coating layer is manufactured by forming a molybdenum carbide (MoC and MoC2) coating layers on the surfaces of the substrates at high temperature, and the subsequent vapor-deposition of Si. The MoSi2—SiC nanocomposite coating layer has a microstructure in which SiC particles are mostly located on the equiaxed MoSi2 grain boundary. The MoSi2—SiC nanocomposite coating layer can have a close thermal expansion coefficient to that of the substrate by controlling a volume fraction of SiC particles exisiting in the nanocomposite coating. As a result, the generation of cracks due to the mismatch in the thermal expansion coefficients between the substrate and the nanocomposite coating layer is suppressed and the high-temperature repeated thermal cyclic oxidation resistance and the low-temperature oxidation resistance of the coated substrate are improved.