Thermal conductivity of ceramic/metal composites from preforms produced by freeze casting |
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| Affiliation: | 1. Belgian Ceramic Research Centre (BCRC), Avenue du Gouverneur Cornez, 4, B-7000 Mons, Belgium;2. Laboratoire des Matériaux Céramiques et Procédés Associés, Université de Valenciennes et du Hainaut-Cambrésis, Boulevard Charles de Gaulle, 59600 Maubeuge, France;3. UMONS-FPMs, Pôle Matériaux – Service Science des matériaux, Rue de l’Epargne 56, B-7000 Mons, Belgium;4. École Nationale Supérieure de Céramique Industrielle, SPCTS, UMR 7315, 12 Rue Atlantis, F-87068 Limoges, France;1. Laboratory of Materials Technology, Federal University of Campina Grande, Aprígio Veloso, 882, Campina Grande, PB, Brazil;2. Department of Materials Engineering, Federal University of Campina Grande, Aprígio Veloso, 882, Campina Grande, PB Brazil;1. State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;2. Key Laboratory of Automobile Materials (Ministry of Education), Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, PR China;1. State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;2. Key Laboratory of Automobile Materials (Ministry of Education), Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, PR China;3. Department of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, PR China |
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| Abstract: | Porous alumina and zirconia preforms, processed by ice templating, have been used to manufacture ceramic/metal composites by aluminium alloy infiltration. The aim of the present work is to study the influence of the ceramic material nature and of the initial porous structure on the thermal conductivity anisotropy of the composite in order to assess potential applications in the field of thermal management. The materials are characterised in terms of pore volume fraction and pore size before and after metal infiltration. The freeze casted preforms exhibit anisotropic lamellar structures with ellipsoidal pores ranging from 35 µm to 40 µm and porosity fractions from 64 to 67%. After metal infiltration, composite parts present the same anisotropic morphology, which correspond to alternating ceramic and metal layers. Thermal conductivities have been determined, with an average of 80 W m?1 K?1 and 13 W m?1 K?1 parallel and perpendicular to the freezing direction respectively, for zirconia/metal composites. Theoretical values of thermal conductivity can be calculated using the Maxwell-Eucken relation, to handle the residual porosity, in combination with series and parallel resistance models to describe the overall anisotropic character. These give good agreement to experiment. |
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| Keywords: | Freeze casting Ice templating Ceramic/metal composite Anisotropy Thermal conductivity |
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