Thermal conductivity of porous alumina ceramics prepared using starch as a pore-forming agent |
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| Authors: | Zuzana Živcová Eva Gregorová Willi Pabst David S. Smith Aurélie Michot Céline Poulier |
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| Affiliation: | 1. Department of Glass and Ceramics, Institute of Chemical Technology, Prague (ICT Prague), Technická 5, 166 28 Prague 6, Czech Republic;2. Groupe d’Etude des Matériaux Hétérogènes, École Nationale Supérieure de Céramique Industrielle (ENSCI), 47-73, Avenue Albert Thomas, 87065 Limoges Cedex, France;1. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100024, PR China;2. Institute of technical information for building materials industry, Beijing 100024, PR China;1. High Temperature Ceramics Institute, Zhengzhou University, Zhengzhou 450052, China;2. College of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;2. School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China |
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| Abstract: | The thermal conductivity of porous alumina ceramics prepared using different types of starch (potato, wheat, corn, and rice starch) as pore-forming agents is investigated from room temperature up to 500 °C. The temperature dependence measured for alumina ceramics of different porosity (in the range 6–47%) is fitted with second-order polynomials and 1/T-type relations, and compared to available literature data for dense alumina. It is found that the porosity dependence of the relative thermal conductivity kr = k/k0 is well described by a modified exponential relation of the form kr = exp(?1.5?/(1 ? ?)), where ? is the porosity. This finding is in agreement with other literature data and seems to indicate a common feature of all porous materials with microstructures resulting from fugitive pore-forming agents. |
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