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Elastic properties of porous oxide ceramics prepared using starch as a pore-forming agent
Authors:Zuzana ?ivcová  Martin ?erný  Willi Pabst  Eva Gregorová
Affiliation:1. Department of Glass and Ceramics, Institute of Chemical Technology, Prague (ICT Prague), Technická 5, 166 28 Prague 6, Czech Republic;2. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Hole?ovi?kách 41, 182 09 Prague 8, Czech Republic;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, P R China;2. Nanjing Sanle Electronic Information Industry Group Co., Ltd., Nanjing, 211800, P R China;1. Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran;2. Center of Excellence in Structures and Earthquake Engineering, Department of Civil Engineering, Sharif University of Technology, P.O. Box. 11365-9313, Tehran, Iran;1. Department of Glass and Ceramics, University of Chemistry and Technology, Prague (UCT Prague), Technická 5, Prague 6, 166 28, Czech Republic;2. Math2Market GmbH, Stiftsplatz 5, Kaiserlautern, 67655, Germany;1. Institute of Inorganic Chemistry, Slovak Academy of Science, Dúbravská cesta 9, 842 36 Bratislava, Slovakia;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Ko?ice, Slovakia;3. Institute of Medical Biology and Clinical Genetics, Faculty of Medecine, Comenius University, Sasinkova 4, Bratislava, Slovakia;4. Associated Tissue Bank of Faculty of Medecine of P.J. ?afárik University and L. Pasteur Faculty Hospital, Triedna SNP 1, Ko?ice, Slovakia;1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;2. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Abstract:The elastic properties, in particular the tensile modulus (Young's modulus) and Poisson ratio, of porous alumina, zirconia, and alumina–zirconia composite ceramics are studied using the resonance frequency method and the results compared with theoretical predictions. Starch is used as a pore-forming agent, so that the resulting microstructure is essentially of the matrix-inclusion type (with large bulk pores, connected by small throats when a percolation threshold is exceeded). It is found that for this type of microstructure the porosity dependence of the Young's modulus is significantly below the upper Hashin–Shtrikman bound and the power-law prediction; it corresponds well, however, to a recently proposed exponential relation and to an empirical volume-weighted average of the upper and lower Hashin–Shtrikman bounds. Results for all three types of ceramics indicate that – in the porosity range considered, i.e. up to approximately 50% – the Poisson ratio depends only slightly on porosity.
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