The microstructure,coefficient of thermal expansion and flexural strength of cordierite ceramics prepared from alumina with different particle sizes |
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| Affiliation: | 1. Jožef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia;2. ETI Elektroelement d.d., Obrezija 5, Izlake, Slovenia;1. Laboratoire Matériaux, Procédés, Environnement et Qualité, Ecole Nationale des Sciences Appliquées, Route Sidi Bouzid, BP 63, Safi, Morocco;2. Laboratoire de la Matière Condensée et de l’Environnement, Faculté des Sciences Semlalia, Avenue My Abdellah, BP 2390 Marrakech, Morocco;3. Groupe d’Etude des Matériaux Hétérogènes GEMH, ENSCI, 12 rue Atlantis, 87068 Limoges Cedex, France;1. Laboratoire Matériaux, Procédés, Environnement et Qualité, Ecole Nationale des Sciences Appliquées, Route Sidi Bouzid, BP 63, Safi, Morocco;2. Laboratoire de la Matière Condensée et de l’Environnement, Facultédes Sciences Semlalia, Avenue My Abdellah, BP 2390, Marrakech, Morocco;3. Science des Procédés Céramiques et de Traitements de Surface, UMR CNRS 7315, ENSCI, 12 rue Atlantis, 87068 Limoges Cedex, France;1. Laboratoire de Chimie Inorganique Appliquée, Département de Chimie Inorganique, Faculté des Sciences, Université de Yaoundé I, Cameroon;2. Laboratoire de Sciences des Matériaux, Département de Physique, Faculté des Sciences, Université de Yaoundé I, Cameroon;3. Laboratoire de Physicochimie des Matériaux et Environnement, Département de Chimie, Faculté des Sciences, Université Cadi Ayyad, Morocco;1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37934, USA;2. BAM Federal Institute for Materials Research and Testing, Berlin D-12200, Germany;3. Reliability Division, Rolls Royce LG Fuel Cell System Inc., North Canton, OH 44720, USA;4. Ceramics and Catalyst Technology, Cummins, Inc., Columbus, IN 47201, USA |
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| Abstract: | Cordierite ceramics were produced from alumina with 5 and 0.65 μm particle sizes or AlOOH and talc, clays and feldspar, to determine the influence of the alumina particle size on the microstructure, coefficient of thermal expansion (CTE) and flexural strength (FS) of the ceramics. After sintering at 1300 °C the ceramics made from 5-μm-sized alumina consisted of cordierite, glass, quartz, mullite and alumina, and had the highest density, FS and CTE. The alumina grains act as inclusions, from which the trajectories of the cracks were deflected or terminated, which increases the FS and CTE. The ceramics from sub-micrometre-sized alumina or AlOOH contained a negligable amount and no alumina, respectively, together with other phases. This is reflected in the low CTE and FS. The cordierite ceramic with the lowest CTE of ∼2.0 × 10−6 K−1 and a high FS of 100 MPa was prepared from the 0.65-μm-sized alumina particles. |
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| Keywords: | Cordierite Sintering Microstructure Flexural strength Coefficient of thermal expansion |
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