Effects of CeO2 addition on the properties of cordierite-bonded porous SiC ceramics |
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| Authors: | Shifeng Liu Yu-ping Zeng Dongliang Jiang |
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| Affiliation: | 1. Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Dingxi Road, Shanghai 20050, China;2. Graduate School of the Chinese Academy of Science, Beijing 100049, China;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. College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, China;2. Collaborative Innovation Center of Nonferrous Metals Henan Province, Luoyang, 471023, China;1. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan University, Haikou 570228, China;2. College of Physics and Electronic Information, Tianjin Normal University, Tianjin 300387, China;3. State Key Laboratory of New Ceramics & Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 51508, Republic of Korea;1. Jo?ef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia;2. ETI Elektroelement d.d., Obrezija 5, Izlake, Slovenia |
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| Abstract: | Cordierite-bonded porous SiC ceramics were fabricated with and without CeO2 addition in air by an in situ reaction bonding technique. The effects of CeO2 addition on the phase composition, microstructure and properties of porous SiC ceramics were investigated. It was found that the CeO2 addition strongly promotes the phase transformation towards cordierite while inhibits the formation of spinel. With CeO2 addition, the neck growth was enhanced, and the mechanical properties of porous SiC ceramics were improved. When 2.0 wt.% CeO2 was added, a flexural strength of 35.3 MPa was achieved at an open porosity of 42.1%. Pore size distribution characterization by mercury porosimetry indicated that 2.0 wt.% CeO2 addition enlarged the average pore size of porous SiC ceramics and introduced a bigger homogeneity in pore size. In addition, it was found that higher permeability was obtained after adding 2.0 wt.% CeO2. Moreover, the thermal shock resistance of cordierite-bonded porous SiC ceramics was also improved by the addition of CeO2. |
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