Freeze casting of composite system with stable fiber network and movable particles

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• 作者：Xiaoxia Hu ; Lina Yang ; Lingyu Li ; Dieni Xie ; Haiyan Du ; ^{hydu@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Alumina fibers ; Freeze casting ; Structural formation ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：36
• 期：16
• 页码：4147-4153
• 全文大小：2623 K

文摘

Freeze casting was employed to fabricate alumina fiber-based porous ceramics. The binder particles were rejected by ice crystals from the gaps of the network to fibers and bonded them to obtain strong and light network. The effects of fiber character, cooling temperature and slurry viscosity on the structure formation were investigated. The structure and properties of the fibrous porous ceramics were determined by two factors: the fiber network and the dispersion of binders. The cooling temperature and slurry viscosity affected the dispersion of the particles rejected by the solidification front while the fiber length affected the fiber network. The material with optimal properties was obtained with 5 wt% PVA, 5 wt% silica sol and 1 vol% alumina fibers when freezing at −20 °C. The bulk density was 0.199 g/cm³ and the specific strength was 3.860 N m/kg.