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Vol.51, No.4, 317 ~ 324, 2013
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| Title |
| Effects of Mg Addition and Temperatures on the Melt-Down Behavior of Al-xMg-CNT Complex Powder Compacts |
| 임정규 Jung Kyu Lim , 최경환 Kyong Hwan Choe , 김상섭 Sang Sub Kim , 조규섭 Gue Serb Cho |
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| Abstract |
| We conducted melt-down experiments on Al-xMg-carbon nanotube (CNT) complex powder compacts at 700℃ and 800℃ for carrying the CNTs into the molten Al7021 matrix alloy. The parameters in the melting experiments were the holding temperatures and the amount of Mg content. The microstructures of the melt-down compacts were observed by optical microscopy (OM) and field emission scanning electro-microscopy (FESEM). The several phases obtained from the reaction products within the Al-xMg-CNT compacts were identified by energy dispersive X-ray spectroscopy (EDXS) and X-Ray diffractometry (XRD). The complete melt-down area was increased due to a large addition of Mg in the compacts and outer areas remained as undissolved powder compacts due to the large number of oxidation products such as MgO, MgAl2O4 and Al2O3. CNTs were observed on the surface of Al powders with oxidation products at 700℃ in a melting experiment. However, at 800℃, the CNT agglomerates moved away from the center because of the poor wettability and low density of the CNTs. |
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| Key Words |
| composites, sintering, oxidation, X-ray diffraction, carbon nanotube |
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