Abstract:
PURPOSE: A method for fabricating a nanocomposite powder of graphene and ceramic is provided to uniformly disperse graphene in a matrix and to improve mechanical, electrical, or thermal property. CONSTITUTION: A nanocomposite powder of graphene and ceramic contains a matrix ceramic and graphene. The graphene is dispersed in the matrix ceramic. A nanocomposite material contains sintered nanocomposite power of graphene and ceramic. A method for preparing the nanocomposite powder comprises: a step of dispersing a graphene oxide in a solvent; and a step of injecting a metallic salt into the solvent. [Reference numerals] (AA) Grain boundary; (BB) Matrix ceramic; (CC) Graphene
Abstract:
PURPOSE: A manufacturing method of carbon nanotube/metal composite material is provided to prevent length damage of the carbon nanotube due to acid and remarkably improve elasticity. CONSTITUTION: A manufacturing method of carbon nanotube/metal composite material comprises next steps: mixing the carbon nanotube with amphiphilic polymer or conjugated polymer solution; coating the carbon nanotube; manufacturing carbon nanotube and metal powder by reacting the coated carbon nanotube and metal salt; and mixing and sintering the carbon nanotube/metal powder with matrix metal powder. The amphiphilic polymer or conjugated polymer is polyvinyl alcohol, poly phenylene ether, or poly phenylene vinylene. The concentration of the amphiphilic polymer or the conjugated polymer solution is 0.1-10g/l. The weight ratio of the amphiphilic polymer or the conjugated polymer to the carbon nanotube is 1:5-10.
Abstract:
질화물 강화 텅스텐 나노복합재료가 제공된다. 본 발명에 따른 질화물 강화 텅스텐 나노복합재료는 텅스텐 금속 기지 내부에 질화물 세라믹 나노입자가 균일하게 분산되어 있는 것을 특징으로 하며 밀도, 압축강도 및 경도가 우수하기 때문에 국방 무기, 항공기 또는 로켓의 추진기관에 사용되는 내열부품 등 다양한 분야에 활용할 수 있다.
Abstract:
본 발명은 탄소나노구조체와 금속을 결합한 나노복합체의 제조방법에 관한 것으로, 보다 상세하게는 탄소나노구조체를 환원성 용매에 분산시켜 분산액을 제조하는 단계, 상기 분산액과 금속 전구체의 혼합액을 제조하는 단계, 및 상기 혼합액을 열처리하여 금속 전구체를 환원시키는 단계를 포함하는 탄소나노구조체-금속 복합체의 제조방법에 관한 것이다. 본 발명에 따른 제조방법은 탄소나노구조체에 수nm 내지 수백nm의 금속입자가 균일하게 분산되고, 금속입자 크기가 일정하며, 금속입자 형태가 구형으로 결합되어 있는 탄소나노구조체-금속 복합체를 제조할 수 있는 장점이 있다.
Abstract:
PURPOSE: Non-covalent functionalized carbon nanotubes and a method for manufacturing the same are provided to improve the compatibility of the carbon nanotubes with respect to low polarity or non-polarity solvents or various polymers by coating the surface of the carbon nanotubes based on a lipophilic surface modifier. CONSTITUTION: An aromatic molecule with a carboxylic functional group is acylated to obtain an aromatic molecule with an acyl group(S1). The acyl group of the aromatic molecule is reacted with aliphatic amine to generate a lipophilic surface modifier(S2). The surfaces of carbon nanotubes are treated with the lipophilic surface modifier to be non-covalent functionalized(S3). The lipopilic surface modifier is an aromatic molecule in which an aliphatic chain is connected by an amide bond. The aromatic compound of the aromatic molecule is selected from pyrene, porphyrin, and the derivatives of the same.
Abstract:
상기의 기술적 과제를 이루기 위한 본 출원의 일 측면은 그라핀/금속 나노 복합 분말을 제공한다. 상기 그라핀/금속 나노 복합 분말은 기지 금속 및 상기 기지 금속 내에 분산되고, 상기 기지 금속의 강화재로 작용하는 그라핀을 포함한다. 상기 그라핀은 상기 기지 금속의 금속 입자 사이에 박막 형태로 개재하여 상기 금속 입자와 결합한다. 상기 기지 금속 내의 상기 그라핀의 함량은 상기 그라핀 상호간의 반응에 의해 상기 그라핀의 구조 변형이 방지될 수 있는 한도인 0 vol% 을 초과하여 30 vol% 미만이다.
Abstract:
PURPOSE: Tungsten nanocomposites reinforced with nitride ceramic nanoparticles and a method for fabricating the same are provided to uniformly nitride ceramic nanoparticles in a tungsten matrix by arranging the pre-set ratio of the nitride ceramic nanoparticles in the tungsten nanocomposites. CONSTITUTION: Nitride ceramic nanoparticles are uniformly dispersed in a tungsten matrix. A mechanical alloying method using high energy milling process is implemented to the mixture to obtain tungsten nanocomposites reinforced with nitride ceramic nanoparticles. 0.1 to 50 volume% of the nitride ceramic nanoparticles are arranged in the tungsten nanocomposites reinforced with nitride ceramic nanoparticles. The nitride ceramic nanoparticles include one or more selected from a group including ZrN, HfN, BN, AlN, Si_3N_4, TiN, TaN, Ta_2N, VN, CrN, Cr_2N, Mo_2N, NbN, WN, and W_2N.
Abstract:
PURPOSE: A fabrication method of nanocomposite powders consisted with carbon nanotube and metal is provided to prevent damage to carbon nanotube by manufacturing nanocomposite powder via two steps of low speed and high speed milling process. CONSTITUTION: A fabrication method of nanocomposite powders consisted with carbon nanotube and metal is as follows. Carbon nanotube and metal base powder are uniformly mixed by a low speed milling(S10). The low speed milling process performs in a milling speed of 1rpm~100rpm for 20 hours. The carbon nanotube and metal base powder uniformly mixed by the low speed milling process is milled at high speed for uniform dispersion(S20). The high speed milling process is performed in speed of 100rpm~5000rpm for 1 hour.
Abstract:
A multilayer composite material for absorbing underwater sound is provided to lower a surface reflection coefficient under the water and to control sound absorption performance. A multilayer composite material for absorbing underwater sound is composed of a non-reflective surface layer(100) with sound reflectivity within 1% and a sound absorbing layer(200) formed in the surface layer to absorb sound. The surface layer and the sound absorbing layer consist of base rubber powder having sound impedance of 1.46~1.96MRay1 and glass transition temperature of -40~-60 deg.C, a cross-linking agent, and a reinforcing agent mixed with the cross-linking agent and dispersed in the base powder. The volume fraction of the reinforcing agent is gradually increased from the surface of the multi-layer composite material to the inside.
Abstract:
탄소나노튜브와 금속으로 이루어진 나노복합분말 제조방법과 그에 의하여 제조된 나노복합분말 및 그 나노복합분말을 이용한 전계방출디스플레이용 에미터에 관하여 개시한다. 본 발명의 나노복합분말은 탄소나노튜브를 비극성 용매에 투입 및 분산시키고, 탄소나노튜브가 분산된 용매에 환원제와 금속 전구체 분말을 투입하고 가열하여 금속 전구체를 환원시켜 탄소나노튜브 표면에 금속을 코팅시킴으로써, 팁 형태로 탄소나노튜브 소정영역이 노출되도록 나노 크기의 금속 분말 덩어리에 탄소나노튜브들이 박혀있는 형상을 이루는 것을 특징으로 한다. 그리고, 전계방출디스플레이용 에미터는 그 나노복합분말을 ITO 글라스 및 소다석회유리가 포함된 세라믹 기판 상에 스크린 프린팅하여 제조되는 것을 특징으로 한다. 본 발명에 의하면, 탄소나노튜브의 안정성이 확보되고 수명이 증가하며, 전계방출 효율이 증대된다. 탄소나노튜브, 금속 전구체, 나노복합분말, 팁, 전계방출디스플레이, 에미터