Abstract:
본 발명은 탄소 구조체를 포함하는 3차원 구조체의 내부 표면에 탄소나노와이어를 직접적으로 합성하는 방법에 관한 것으로, 자세하게는 구조체 내부에 존재하는 기공이나 간극 표면에 고밀도로 탄소나노와이어를 합성하는 방법 및 이에 의하여 합성된 계층 구조체(hierarchical structure)에 대한 것이다. 본 발명에 따르면 기계적 물성이나 전도성의 저하를 가져오는 구조체 내부의 미세 기공이나 간극을 고밀도의 탄소나노와이어로 채울 수 있기 때문에 최종 생산품의 기계적 또는 전기적 성능을 획기적으로 향상시킬 수 있다.
Abstract:
Provided are method and system of ammonia based reversible fuel cell. The system comprises: an energy generation unit; an SORFC, an ammonia storage part; a water tank for the SORFC; a nitrogen supplying unit for the SORFC; and a smart grid control unit. The method comprises the steps of: producing ammonia electrochemically by supplying the electrical energy generated by the energy generation unit to the SORFC according to the order from the smart grid control unit, and by using water and nitrogen; storing the ammonia in the ammonia storage part; disassembling the ammonia by supplying it to the SORFC; integrating each cell for the ammonia synthesis and its use, performing the electrical energy generation using the hydrogen produced during the disassembling step of ammonia, then using the ammonia reversibly. [Reference numerals] (a) Energy power generation unit;(AA) Production;(b) Regenerative fuel cell(Solid Oxide Regenerative Fuel Cell);(BB) Consumption;(c) NH_3 storage part;(CC,DD,EE,FF) Electricity;(d) H_2O supplying part;(e) N_2 supplying part;(f) Smart grid control part;(GG) Consumer
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 metal support type thermal to electric conversion cell is provided to reduce fabrication costs by omitting a conventional high temperature sintering process. CONSTITUTION: A porous metal supporter is a tube form. A porous electrode function layer (120) is formed on the surface of a porous metal supporter. A solid electrolyte (130) is formed on the surface of the porous electrode function layer. A porous electrode (140) is formed on the surface of the solid electrolyte. The solid electrolyte forms a thin film.
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:
PURPOSE: A current collector for fuel cell is provided to improve operational efficiency, lowers fabrication cost, and lightens weight of the fuel battery. CONSTITUTION: A current collector for a fuel battery comprises conductive material and silicon carbide. The conductive material locates inside the silicon carbide. The current collector has a structure of core-shell which silicon carbide covers the conductive material. The conductive material includes one or two kinds selected from a group including copper(Cu), nickel(Ni), gold(Au), platinum(Pt), palladium(Pd), ruthenium(Ru), iridium(Ir), silicon(Si), and carbon. The conductive material and silicon carbide are included in weight ratio of 1:9-9:1.
Abstract:
PURPOSE: Mullite-zirconia combined silicon carbide ceramic compositions for high temperature gas filters and a method for preparing the high temperature gas filters are provided to increase the strength of the filters by mixing mullite, zirconia, and calcium carbonate with silicon carbide powder. CONSTITUTION: Mullite-zirconia combined silicon carbide ceramic compositions for high temperature gas filters include silicon carbide powder, mullite powder, calcium carbonate powder, and zirconia powder. A method for preparing the high temperature gas filters includes the following: An organic binder and a solvent are mixed with mullite-zirconia combined silicon carbide ceramic compositions to form a filter. The filter is dried and sintered. The organic binder is at least one selected from a group including methylcellulose, ethylcellulose, carboxymethylcellulose, and polyvinyl alcohol.
Abstract:
A tube type solid oxide fuel cell is provided to ensure good current flow of a tube type electrode support and excellent strength while reducing wall thickness of a supporter, and to have no need of separate tube. A tube type solid oxide fuel cell comprises a tube type electrode supporter connecting outer wall(101) and an inside core(102) by many bridges(106); a fluid flow part(103) formed by a plurality of bridges between the core and outer wall of the electrode support; an electrolyte layer which is coated on outer surface of the electrode support; and an electrode formed on the outer side of the electrolyte layer.
Abstract:
A microbial biofuel cell is provided to improve the battery capacity by forming nanowires (or nanorods) having high conductivity to a negative electrode. A microbial biofuel cell comprises a negative electrode(110) formed with a plurality of nanowires(112) delivering the electrons reduced by the reducing power generated by the energy metabolism of microorganism; a positive electrode(120) formed with a transition metal(122) capable of being oxidized with the oxygen; a reaction bath(130) to contact one side of the positive electrode with the air; an electrolyte(140) accommodated inside the reaction bath; and a microbial catalyst(150) accommodated inside the reaction bath.
Abstract:
A method for manufacturing silicon nitride ceramics is provided to produce a sintered material of silicon nitride having low porosity easily at low temperature by performing both gas-phase reaction sintering and atmospheric pressure sintering at a temperature below 1820 °C. A method for manufacturing silicon nitride ceramics includes the steps of: adding 5-50wt% of a metal silicon powder to 100wt% of the sum of the metal silicon powder and a silicon nitride(Si3N4) powder, and mixing 1-5wt% of an alumina powder and 1-6wt% of an yttria(Y2O3) powder based on the total weight of the metal silicon and silicon nitride; molding the mixture into a predetermined shape to produce a molded material; controlling a heating rate at a temperature of 1100-1400 °C to sinter the metal silicon contained in the molded material under a nitrogen gas atmosphere; and controlling a heating rate at a temperature of 1400-1820 °C to densify the silicon nitride particles in the sintered material by an eutectic liquid phase formation of an oxide sintering aid.
Abstract translation:提供一种制造氮化硅陶瓷的方法,通过在低于1820℃的温度下进行气相反应烧结和大气压烧结,在低温下容易地制造具有低孔率的氮化硅的烧结材料。 制造氮化硅陶瓷的方法包括以下步骤:将5-50重量%的金属硅粉末加入到金属硅粉末和氮化硅(Si 3 N 4)粉末的总和的100重量%中,并将1-5重量% 氧化铝粉末和基于金属硅和氮化硅的总重量的1-6重量%的氧化钇(Y 2 O 3)粉末; 将混合物成型为预定形状以产生模制材料; 控制在1100-1400℃的温度下的加热速率,以在氮气气氛下烧结成型材料中所含的金属硅; 并且在1400-1820℃的温度下控制加热速率,以通过氧化物烧结助剂的共晶液相形成来致密烧结材料中的氮化硅颗粒。