Abstract: A method for forming a coating layer on a metal base material for a semiconductor reactor according to an aspect of the present invention comprises the steps of: immersing a metal base material for a semiconductor reactor in an aqueous alkaline electrolyte solution containing NaOH and NaAlO2; and connecting an electrode to the metal base material and supplying power to the electrode to form a coating layer on the metal base material through a plasma electrolytic oxidation (PEO) method.

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: An analysis strip and an apparatus using the analysis strip are provided. The analysis strip includes an introduction part through which a sample including a target material is introduced, a target strip connected to the introduction part and configured to detect concentration of a target material included in the sample according to a flow of the introduced sample, and an auxiliary strip connected to the introduction part that is pre-impregnated with certain densities and configured to detect concentration of a mixed material of the target material and the pre-impregnated material according to the flow of the introduced sample, wherein the target strip and the auxiliary strip comprise a same material.

Abstract: A humidifier including a storage chamber configured to store water, an electrolytic unit configured to electrolyze water, a first and second pipe to which the electrolyzed water is introduced, a first and second valve configured to open/close a fluid path of the first pipe and second pipe, a filter unit disposed at the first pipe and configured to filter the electrolyzed water, a humidification chamber configured to be supplied with water from one of the first or the second pipe, and a control unit configured to supply the filtered water to the humidification chamber at a humidification mode by controlling the first valve and supply the electrolyzed water to the humidification chamber at a sterilization mode by controlling the second valve, the humidifier further including a drainage hole and a drainage valve to open/close the drainage hole, and a tray to store the water being discharged through the drainage hole.

Abstract: Disclosed is to a method for manufacturing a cobalt boride coating layer on the surface of iron-based metals by using a pack cementation process. In particular, the present invention relates to a method for manufacturing a cobalt boride coating layer by forming a composite coating layer on the surface of steels which is composed of an outmost layer having a composition of cobalt boride (Co2B) and an inner layer having a composition of iron-cobalt boride ((Fe,Co)2B). Since the cobalt boride coating layer is a compact coating layer having little defects such as pores, it can improve physical properties such as corrosion resistance, wear resistance and oxidation resistance of steels.

Abstract: Disclosed is to a method for manufacturing a cobalt boride coating layer on the surface of iron-based metals by using a pack cementation process. In particular, the present invention relates to a method for manufacturing a cobalt boride coating layer by forming a composite coating layer on the surface of steels which is composed of an outmost layer having a composition of cobalt boride (Co2B) and an inner layer having a composition of iron-cobalt boride ((Fe,Co)2B). Since the cobalt boride coating layer is a compact coating layer having little defects such as pores, it can improve physical properties such as corrosion resistance, wear resistance and oxidation resistance of steels.

Abstract: A MoSi2—Si3N4 composite coating which is coated on a surface of base materials. The MoSi2—Si3N4 composite coating on the surface of the base material can be formed by forming a Mo2N diffusion layer by vapor-depositing of nitrogen on the surface of the base material and forming a MoSi2—Si3N4 composite coating by vapor-depositing of silicon on the surface of the Mo2N diffusion layer, or the MoSi2—Si3N4 composite coating on the surface of the base material can be formed by forming a MoSi2 diffusion layer by vapor-depositing of silicon on a surface of a base material by the CVD method, transforming the MoSi2 diffusion layer into a Mo5Si3 diffusion layer by heating under a high-purity hydrogen or argon atmosphere, forming a MoSi2—Si3N4 composite diffusion layer by vapor-depositing of nitrogen on the surface of the MosSi3 diffusion layer by the CVD method and forming a MoSi2—Si3N4 composite coating by vapor-depositing of silicon on the surface of the MoSi2—Si3N4 composite diffusion layer.

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: 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.

Abstract: Corrosion resistant multi-layered clad plates or sheets with high bonding strength is disclosed. According to the present invention, clad metals with high corrosion resistance such as Ti, Nb, V, or Zr and their alloys can be bonded with a cheap substrate such as Fe, Cu, or Ni and their alloys by the resistance seam welding. Using the insert metal causing the eutectic reaction, the clad metal can be strongly bonded with the substrate. Especially, corrosion resistant clad plates with excellent bonding strength can be fabricated by controlling the thickness and the microstructures of the eutectic reaction layer at the interface between the clad metal and the substrate or between the clad metal and the insert metal.

Abstract: In a method for fabricating a Si—Al alloy packaging material, by adding Al—Si alloy powders to Si powders and pressurizing-forming it, or by pressurizing-filling Si powders or a preforming body of Si powders with Al—Si alloy melt, a Si—Al alloy packaging material having good characteristics can be obtained.

Abstract: A MoSi2—Si3N4 composite coating which is coated on a surface of base materials which are molybden, molybden alloy, molybden-coated niobium or molybden-coated niobium alloy and a manufacturing method thereof.

Abstract: In a method for fabricating a Si—Al alloy packaging material, by adding Al—Si alloy powders to Si powders and pressurizing-forming it, or by pressurizing-filling Si powders or a preforming body of Si powders with Al—Si alloy melt, a Si—Al alloy packaging material having good characteristics can be obtained.