Preparation and characterization of foamed microporous mullite ceramics based on kyanite

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• 作者：Huishi Guo^a ; Fangbao Ye^a ; ^{fbyecn@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wenfeng Li^b ; Xinzhao Song^a ; Guofeng Xie^a
• 关键词：A. Foaming method ; B and D. Microporous mullite ; C. Thermal conductivity ; D. Kyanite
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14645-14651
• 全文大小：1911 K

文摘

A new approach has been developed for preparing microporous mullite ceramics based on kyanite obtained by foaming with aluminate cement as the gel-former. By using this method, foams in slurries are effectively stabilized, microporous mullite ceramics with high open porosity (53–77.3%), high compressive strength (5.5–50.5 MPa), small mean pore size (2.5–9.1 渭m) and low thermal conductivity (0.37–0.45 W/mK at 1100 °C) are prepared. Effects of foaming agent addition on the microstructures and properties of samples are investigated. With increasing foaming agent addition, the number and size of pores increase firstly and then tend to be constant. The pore structure looks like a bird壮s nest, in which there are a lot of needle-like mullites, which results in the effective pore size smaller.