Abstract:
The present invention relates to a carbon fiber reinforced silicon carbide composite and a manufacturing method thereof, more specifically, to a carbon fiber reinforced silicon carbide composite which forms a carbon nanotube inside a carbon fiber reinforced silicon carbide composite material, and reduces the amount of non-reacted metal and improves strength by melting and penetrating molten metal silicon.
Abstract:
PURPOSE: A manufacturing method of a high density fiber-reinforced ceramic composite is provided to manufacture a matrix structure ceramic composite in short time without using an expensive device. CONSTITUTION: A manufacturing method of a high density fiber-reinforced ceramic composite comprises the following steps: dipping a fiber molded product into phenol resin slurry which is mixed with a filler component; carbonizing the dipped fiber molded product; primary react-sintering the fiber molded product by heat treating the carbonized fiber molded products under vacuum atmosphere; dipping the cooled fiber molded product into a polymer precursor for SiC production after cooling the fiber molded product down to room temperature; and secondary react-sintering the fiber molded product by filling metal silicon powder in the surface of the fiber molded product and fusing under the vacuum condition. [Reference numerals] (AA) Composite of a comparative embodiment 1; (BB) Composite of an embodiment 1; (CC) Composite of an embodiment 3; (DD) Composite of an embodiment 4
Abstract:
본 발명에 따른 평관형 고체 산화물 전지는 내부에 길이방향으로 형성된 제1 가스 유동 채널을 포함하고, 상기 제1 가스 유동 채널의 일단부에는 제1 가스가 유입되는 가스 유입구가 형성되고, 상기 제1 가스 유도 채널의 타단부에는 제1 가스가 유출되는 가스 유출구가 형성되어 있는 복수의 고체산화물 단위 전지; 서로 인접하는 고체 산화물 단위 전지 각각의 가스 유입구와 가스 유출구는 서로 마주 보도록 배열되고, 서로 마주보는 상기 가스 유입구와 가스 유출구 사이에 위치하여 상기 서로 인접하는 고체 산화물 단위 전지 각각의 제1 가스 유동 채널을 서로 연통시켜주는 채널 연결부; 및 서로 마주보는 상기 가스 유입구 및 가스 유출구와 상기 채널 연결부 사이에 게재하여 상기 제1 가스의 누설을 방지하는 링 형상의 압축 밀봉 개스킷을 포함한다.
Abstract:
The present invention relates to a manufacturing method for bentonite granules comprising: (a) a step of adding Na_2CO_3 and sands or alumina in Ca-based bentonite and heating ingredients at a temperature of 300-500°C; and (b) a step of pulverizing Na-based bentonite into granules with a constant size.
Abstract:
PURPOSE: A fabrication method of silicon carbide ceramics filters on the outer surface of which a coating layer is formed is provided to improve dust collection efficiency. CONSTITUTION: The fabrication method of silicon carbide ceramics filter includes the steps of mixing silicon carbide ceramics powder 100 vol.%, 0.1 to 30.0 vol.% of carbon powder (based on the 100 volume percent of silicon carbide ceramics powder), 1.0 to 15.0 wt.% of inorganic binder (based on the 100 weight percent of silicon carbide ceramics powder), 3.0 to 20.0 wt.% of organic binder, 0.1 to 5.0 wt.% of calcium carbonate, 0.1 to 15.0 wt.% of dispersant, 0.1 to 3.0 wt.% of releasing agent and 10.0 to 35.0 wt.% of water; aging the mixture; pressure extruding the mixture in the form of filter; coating the surface of the filter by spray coating a coating solution; and sintering the coated filter. The coating solution comprises, based on the 100 parts by weight of silicon carbide ceramics powder, 0.5 to 15.0 wt.% of clay, 0.1 to 5.0 wt.% of calcium carbonate, 0.1 to 5.0 wt.% of carboxymethylcellulose, 0.1 to 5.0 wt.% of dispersant, 0.1 to 3.0 wt.% of defoaming agent and 150 to 250 wt.% of water. The sintering process includes the steps of heating the coated ceramic filter up to 800°C at temperature elevation rate of 1 to 2 °C/min; holding it at 800°C for 1-6 hours; heating the coated ceramic filter in the temperature range of 1000 to 1800°C at temperature elevation rate of 4°C/min; holding it at 1000-1800°C for 1-10 hours; and cooling to ambient temperature at a cooling rate of 5°C/min.
Abstract:
PURPOSE: A silicon carbide ceramics filter for dust collection is provided, which has high strength with the addition of alkali metal and alkali earth metal. CONSTITUTION: The fabrication method of silicon carbide ceramics filter includes the steps of mixing silicon carbide ceramics powder 100 wt.%, 1.0 to 15.0 wt.% of sintering aid (clay), 1.0 to 5.0 wt.% of forming auxiliary agent, 0.1 to 5.0 wt.% of alkali metal compound, 0.5 to 5.0 wt.% of dispersant, and 5 to 15.0 wt.% of water; aging the mixture; pressure extruding the mixture in the form of filter at 100 to 800 kg/cm¬2; and sintering the filter. The sintering process includes the steps of heating the ceramic filter up to 800°C at temperature elevation rate of 1.5 °C/min; holding it at 800°C for 6 hours; heating the ceramic filter up to 1400°C at temperature elevation rate of 4°C/min; and holding it 1400°C for 10 hours. The alkali metal compound is selected from alkali element oxides, alkali element nitride, alkali element carbonate, alkali earth element oxides, alkali earth element nitride and alkali earth element.
Abstract:
PURPOSE: A high efficiency heat exchanger using helical inner tube is provided to collect high temperature waste heat so as to reuse. CONSTITUTION: An inner tube is made of ceramic material, formed with an upper tube(21) and a lower tube(21') separating each other and inserted into a heat transfer pipe(11) and has a periphery spirally grooved. The heat transfer pipe is installed to air inlet side header blocks(41,41') and air outlet side header blocks(42,42') and installed to the air inlet side with a fixing flange and coupling bolts so that air flows therein through an inside and an outside of the inner tube simultaneously.