Ultrahigh-strength alumina ceramic foams via gelation of foamed boehmite sol |
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Authors: | Yugu Chen Wenlong Huo Xiaoyan Zhang Yuju Lu Shu Yan Jingjing Liu Ke Gan Jinlong Yang |
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Affiliation: | State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China |
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Abstract: | Ceramic foams with significant porosity and robust mechanical properties have received extensive attentions. However, it is still difficult to achieve excellent compressive strength at high porosity levels. In this work, a gelation of foamed boehmite sol method is proposed to settle this issue. The technological parameters during preparation process are systematically investigated. As-prepared alumina ceramic foams possess unprecedentedly high compressive strength of 34.1-89.1 MPa at high porosity levels of 66.0%-87.2%, which is attributed to the present of hierarchical pore structure, small grain size and pore size. This work demonstrates a facile and novel method for the fabrication of high-performance alumina ceramic foams toward practical applications. |
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Keywords: | alumina ceramic foams compressive strength gelation hierarchical pore structure porosity |
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