Processing and properties of sol gel derived alumina-carbon nano tube composites

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• 作者：Sophia Rani Inbaraj^a ; ^{sophiarani@gmail.com} ; Reeta Mary Francis^b ; N. Victor Jaya^a ; Anil Kumar^c
• 关键词：A. Sintering ; A. Hot isostatic pressing ; B. Composites ; Alumina&ndash ; CNT ; Sol gel
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：4065-4074
• 文件大小：1239 K

摘要

High purity alumina-carbon nano tube (CNT) composites were prepared by an aqueous sol-gel processing route. CNTs were dispersed in alumina sol containing appropriate amount of MgO precursor. Aqueous slurry of alumina was seeded into the sol followed by gelation, drying and calcination at 1000 掳C for 1 h. The calcined powder consisting of alumina-coated CNTs and alumina was milled, sieved, dried, pressed and pressureless sintered at 1400-1600 掳C for 1 h in nitrogen atmosphere. Sintered samples were further isostatically hot pressed at 1300 掳C and the properties were compared with the pressureless sintered samples. Phase formation was followed by XRD study, CNT retention was confirmed by Raman studies and the samples were further characterized for mechanical and microstructural properties.