A novel approach to fabricate porous alumina ceramics with excellent properties via pore-forming agent combined with sol impregnation technique |
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Authors: | Jingjing Liu Wenlong Huo Bo Ren Ke Gan Yuju Lu Xiaoyan Zhang Xinyue Tang Jinlong Yang |
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Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, PR China |
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Abstract: | An innovative approach for fabricating porous alumina ceramics (PACs) with improved mechanical and thermal properties using walnut shell powders as pore-forming agent combined with alumina sol impregnation is reported in the present work. It is demonstrated that uniform distribution of spherical pores can be observed in as-prepared PACs by using above technical route. The decrease of walnut shell powder sizes significantly promotes the enhancement of crushing strength and reduction of thermal conductivity of the PACs. Meanwhile, the impregnated alumina sol is favoring for the formation of spherical micro-pores, then further improves their mechanical and thermal insulation performances. The lowest thermal conductivity and highest crushing strength of resulting sample reach 0.16?W/m?K and 29.2?MPa, respectively. This novel method offers new possibilities to fabricate high-quality PACs. |
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Keywords: | Walnut shell powders Porous alumina ceramics Alumina sol particles Mechanical properties Thermal conductivity |
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