Wanju, South Korea
Wanju, South Korea

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So K.P.,Sungkyunkwan University | Jeong J.C.,Dayou Smart Aluminium Co. | Park J.G.,Dayou Smart Aluminium Co. | Park H.K.,Dayou Smart Aluminium Co. | And 7 more authors.
Composites Science and Technology | Year: 2013

High interfacial strength between the host matrix and reinforcing material is the key factor in developing mechanically robust composite materials. Strengthening the interface between aluminum and carbon nanotubes (CNTs) is very crucial to achieve desirable mechanical properties of Al-CNT composites. Silicon carbide that highly wets Al was coated on the CNT surface in order to promote interfacial strength while preventing CNT disintegration during reinforcement. The SiC interface layer on the CNT surface was successfully formed by a three-step process: (i) mechanical crushing of a Si powder by a CNT promoter, (ii) coating of crushed Si nanoparticles onto CNT surfaces, and (iii) formation of a SiC layer by high temperature annealing. The wettability of CNTs during Al melting was significantly improved by this method, which is critical for improving mechanical properties of Al-CNT composites. Improvements of 15% in tensile strength and 79% in Young's modulus were achieved by adding 0.84. wt% Si powder and 1. wt% CNTs. © 2012.


Patent
Sungkyunkwan University and Dayou Smart Aluminium Co. | Date: 2014-01-22

Provided is a method of producing carbon nanoparticles, involving: applying a mechanical shearing force to a graphite material in a ball mill container combined with a disc, the ball mill container configured to be rotatable in a first direction, and the disc configured to be rotatable in a second direction opposite to the first direction; and separating produced carbon nanoparticles from the graphite material. A method of producing an aluminum-carbon composite material, and an aluminum-carbon composite material obtained by such a method are also provided.


Patent
Sungkyunkwan University and Dayou Smart Aluminium Co. | Date: 2011-12-14

Disclosed are a method for preparing a nanoparticle by using a carbon nanotube, and the nanoparticle prepared by the method. In the disclosed method, by using a carbon nanotube having a physically solid structure and a chemically solid bond, a powder particle made of metal, polymer, ceramic or the like is milled to a nano-size. Also, the nanoparticle prepared by the method has a small size and includes the carbon nanotube. Thus, when the method is applied to a highly oxidative metal, the nanoparticle can be applied to related fields requiring ignitability such as solid fuel, gunpowder, and the like. Also, the carbon nanotube has good mechanical properties and electrical conductivity, and thus can be applied to the related products.


Patent
Sungkyunkwan University and Dayou Smart Aluminium Co. | Date: 2012-08-29

Disclosed is a method for hardening interface of a carbon material by using nano silicon carbide coating. A carbon material-aluminum composite prepared by the disclosed method is light in weight, and has a high dynamic strength, and thus can be applied to currently used cars and aluminum wheels. Furthermore, the composite can be utilized as a material for aircrafts, spacecraft, ships, etc. requiring a high strength.


Lee C.-W.,Korea Institute of Industrial Technology | Kim I.-H.,Korea Institute of Industrial Technology | Lee W.,Korea Institute of Industrial Technology | Ko S.-H.,Korea Institute of Industrial Technology | And 5 more authors.
Surface and Interface Analysis | Year: 2010

SiC-coated carbon fibers for aluminum-carbon composites were synthesized with carbothermal reduction. For the SiC layer formation on the surface of carbon fiber, silica sol was coated and heat treated at a temperature of 1460 and 1500 °C. SiC layer formation by carbothermal reduction complete at above 1500 °C for 1 h. From TGA in atmosphere, SiC coating effectively protected against the oxidation of graphite. The thickness of the SiC coating layer ranged from 150 to 300 nm and the layer was formed homogenously along the surface of carbon fiber. As the first step of reaction for SiC formation, it is generally accepted that SiO is formed and vaporized in interface between fiber and silica. It is analogized in this work that the SiO vapor reacts directly with carbon fiber, resulting in formation of SiC phase. From the TEM results, the SiC layer was confirmed as a ZnS-type FCC structure. Copyright © 2010 John Wiley & Sons, Ltd.

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