Development of high thermal conductivity Al–Si/C/VGCF composites with C/VGCF foam

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• 作者：Keita Ozawa ; Sung-Moo Song ; Sotaro Yamauchi ; Hiroki Wada ; Koh-ichi Sugimoto
• 关键词：Al₂O₃– ; SiO₂ ; Mullite ; Phase diagrams ; Thermodynamic modelling ; Associate species model
• 刊名：Carbon
• 出版年：2007
• 期刊代码：10_00086223
• 类别：ms
• 出版时间：November 2007
• 卷：45
• 期：14
• 页码：2856
• 文件大小：66 K

摘要

Activated carbon honeycomb (ACH) monoliths were prepared by extruding of a mixture of bituminous coal and organic additives and subsequent carbonization and steam activation. Preparation parameters that were varied were carbonization temperature and activation time. The carbonization conditions were 500, 650 and 800 °C for 1 h and the steam activation conditions were 850 °C for 2, 4 and 6 h. The monoliths at various states were characterized by SEM, XRD, nitrogen adsorption and compression test. It was found that carbonization temperature has significant effects on pore size distribution and mechanical strength of ACH monoliths. The ACH monoliths prepared from high carbonization temperatures exhibited lower values of the BET surface area and total pore volume and higher value of the mechanical strength than those of the ACH monoliths prepared from low carbonization temperatures. This was attributed to the effect of high temperature carbonization that results in the formation of relatively less defective structures.