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권한상,Marc Leparoux,Jean-Marc Heintz,Jean-François Silvain,Akira Kawasaki 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
We have successfully fabricated highly densified aluminum (Al)-diamond composite materials by a simple hot press method. The thermal conductivity of the Al-diamond composite materials was measured. These materials had different types, sizes and fractions of diamond. These obtained values were discussed based on theoretically calculated values. The thermal conductivity of the composite materials, measured by Laser-Flash method, was found to have slightly increased compared to that of pure bulk Al. The obtained microstructures of the composite materials showed a lot of cleavage existing in the interface between the Al matrix and the diamond particles, which led to the low increment of the thermal conductivity. Moreover, Al-diamond bulk materials with different sintering temperatures in solid state, liquid phase, and transient region between solid and liquid of Al, have been synthesized.
Kwon, Hansang,Park, Jehong,Leparoux, Marc The Korean Powder Metallurgy Institute 2017 한국분말재료학회지 (KPMI) Vol.24 No.3
Synthesized monocrystalline nanodiamond (nD) particles are heat-treated at various temperatures to produce highly structured diamond crystals. The heat-treated nDs show different weight loss ratios during thermogravimetric analysis. The crystallinities of the heat-treated nDs are analyzed using Raman spectroscopy. The average particle sizes of the heat-treated nDs are measured by a dynamic light scattering (DLS) system and direct imaging observation methods. Moreover, individual dispersion behaviors of the heat-treated nD particles are investigated based on ultrasonic dispersion methods. The average particle sizes of the dispersed nDs according to the two different measurement methods show very similar size distributions. Thus, it is possible to produce highly crystallized nD powder particles by a heat-treatment process, and the nD particles are relatively easy to disperse individually without any dispersant. The heat-treated nDs can lead to potential applications such as in nanocomposites, quantum dots, and biomedical materials.
Mechanical Performance of Carbon Nanotube-Reinforced Nanocomposites
Kwon, Han Sang,Leparoux, Marc,Hwang, Kwang Il,Choi, Jun Ho,Kim, Kwon Hoo Trans Tech Publications, Ltd. 2015 Advanced materials research Vol.1110 No.-
<P>There is a continuous demand for next-generation industrial materials because they offer advantages such as high performance, reliable life cycle, reasonable cost, and ease of mass production. Carbon nanotubes (CNTs), which possess unique properties such as beneficial mechanical, electrical, and thermal properties, as well as chemical stability, have received considerable attention as candidates for reinforcing ultra-high-performance nanocomposites. CNT-reinforced Al alloy matrix nanocomposites were fabricated by mechanical ball-milling and hot-pressing processes. The effects of different CNTs on the mechanical properties of the composites were investigated. The mechanical properties were found to change significantly depending on the type of CNT blended with the matrices. The mechanical performance of the nanocomposites can thus be controlled by using different types of CNT reinforcements.</P>
Control of Mechanical Properties of Functionally Graded Dual-Nanoparticle-Reinforced Composites
Kwon, Han Sang,Park, Je Hong,Kim, Kwon Hoo,Leparoux, Marc,Silvain, Jean Francois,Kawasaki, Akira Trans Tech Publications, Ltd. 2018 Materials science forum Vol.941 No.-
<P>Functionally graded aluminium (Al) matrix composite materials reinforced with carbon nanotubes (CNT) and silicon carbide nanoparticles (nSiC) or nanodiamond (nD) were fabricated using a powder-metallurgical route. The nSiC and nD were not only used as a reinforcement but also as an active solid mixing agent for dispersing the CNT in the Al powder. Dual-nanoparticle-reinforced functionally graded multiple-layered composites were found to exhibit different mechanical characteristics. In particular, the hardnesses of the CNT-and nSiC-reinforced composites were dramatically increased, being up to eight times greater (330 HV) than that of bulk pure Al. In the case of the combination of the CNT and nD nanoparticles, the reinforced Al matrix composites exhibited the highest flexural strength (about 760 MPa). This functionally graded dual-nanoparticle approach could also be applied to other nanoreinforced systems, such as ceramics or complex hybrid-matrix materials. Keywords: Carbon nanotubes (CNT), nanosilicon carbide (nSiC), nanodiamond (nD), functionally graded materials (FGM), Powder metallurgy</P>
Hardness of Multi Wall Carbon Nanotubes reinforced aluminium matrix composites
Bradbury, C.R.,Gomon, J.K.,Kollo, L.,Kwon, H.,Leparoux, M. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.585 No.-
The macro hardness (HV<SUB>20</SUB>) was measured for aluminium and 1-9wt% Multi Wall Carbon Nanotubes (MW-CNTs) composites that were milled and hot compressed. The hardness increased with increasing fraction of MW-CNTs up to 6wt% (HV<SUB>20</SUB>=151) and then remained constant. The content of MW-CNTs was significantly higher than reported for similar materials and measurements. The composites were analysed by Raman, TEM and XRD. The Raman and TEM showed MW-CNTs were still present after milling and hot pressing. The XRD was used to determine the Al crystallite size which was used to determine Hall-Petch contribution to the composite hardness.
Effect of milling time on dual-nanoparticulate-reinforced aluminum alloy matrix composite materials
Kwon, H.,Saarna, M.,Yoon, S.,Weidenkaff, A.,Leparoux, M. Elsevier Sequoia 2014 Materials science & engineering. properties, micro Vol.590 No.-
Carbon nanotubes (CNT) and nano-silicon carbide (nSiC)-reinforced aluminum (Al)-6061 alloy matrix composite materials were fabricated using high-energy ball milling and hot-pressing processes. The nSiC was used not only as a solid mixing agent to better disperse the CNTs in the Al powder, but also as a mean of inducing fine particle strengthening. The densification behavior of the dual-nanoparticulate-reinforced composites varied with the milling time. The crystallite sizes of Al in composites became significantly smaller when the milling time was increased. Moreover, the high-energy ball milling time significantly affected the microstructure and mechanical properties of the composites. We believe that the dual-nanoparticulate-reinforced composites can be used in a variety of applications as industrial component materials with precisely controlled properties.
Kwon, H.,Lee, G.G.,Kim, S.G.,Lee, B.W.,Seo, W.C.,Leparoux, M. Elsevier Sequoia 2015 Materials science & engineering. properties, micro Vol.632 No.-
Nanodiamond (nD) and multi-walled carbon nanotubes (CNT) was used to fabricate reinforced pure aluminum (Al) matrix composites by mechanical ball milling and hot-pressing. Pure Al bulk and each single nanoparticle (nD or CNT) reinforced composites was also fabricated for comparison. Micro-Vickers hardness was measured for single (nD or CNT) and dual nanoparticle (mixture of nD and CNT)-reinforced Al matrix composites and showed maximum values that were approximately six times higher than those of pure Al bulk. Four-point bending behaviors were also discussed and the dual nanoparticles-reinforced Al matrix composites showed highest value of the flexural strength (about 760MPa). The fracture surfaces that resulted from the bending test were also observed. Moreover, the crystallite size and lattice strain of the Al particles in the composites were described by the Scherrer equation.