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Papers by Author: Chul Kyu Song

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Thermal Behavior of Carbon Nanotubes in Alumina Matrix Nanocomposites

Authors: Sung Tag Oh, Seung Hwa Yoo, Jae Kyo Jang, Chul Kyu Song, Yong Ho Choa, Sung Goon Kang

Abstract: Thermal behavior and microstructural characterization of the CNTs/Al2O3 nanocomposites with different relative densities were studied by TGA and SEM. The onset temperature for weight loss corresponded to a decomposition of CNTs in TGA increased with an increase of relative density. The activation energy for CNTs decomposition obtained by the Kissinger method increased with increasing relative density. The difference in thermal behavior was explained by the porosity effect on the oxidation and decomposition of CNTs.

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Microstructure and Thermal Stability of Carbon Nanotubes Dispersed Alumina Nanocomposites Prepared by Spark Plasma Sintering

Authors: Yong Ho Choa, Seung Hwa Yoo, Jae Kyo Yang, Chul Kyu Song, Sung Tag Oh, Se Joong Yoon, Sung Goon Kang

Abstract: The influence of relative density on the thermal stability of CNTs-dispersed Al2O3 nanocomposites has been investigated by using thermogravimetric analysis (TGA). TGA revealed that the onset temperature for weight loss increased with an increasing sintering temperature and CNT content. By taking account of the XRD and SEM results, it is suggested that the weight loss is caused by a decomposition of CNTs phase by oxidative atmosphere. The difference in thermal stability was explained by the porosity effect on the oxidation and decomposition behavior of CNTs, because the open pores promote the chemical reaction and gas flow of reactants.