Densification and high-temperature oxidation behavior of SiC sintered with multicomponent rare-earth additives |
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| Affiliation: | 1. Department of Science and Humanities, Sri Krishna College of Engineering and Technology, Coimbatore, 641008, Tamilnadu, India;2. Department of Physics, KPR Institute of Engineering and Technology, Coimbatore, 641407, Tamilnadu, India;3. Physics Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia;1. Department of Inorganic Chemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Krakow, Poland;2. Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507, Warsaw, Poland;3. Department of Silicate Chemistry and Macromolecular Compounds, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059, Krakow, Poland;1. Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;2. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou, 450006, China;3. Shandong aofu Environmental Protection Technology Limited Company, Dezhou, 251599, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. School of Automobile and Transportation Engineering, Guangdong Polytechnic Normal University, Guangzhou, 510665, China;1. Instituto de Física, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;2. CONACYT-Instituto de Física Luis Rivera Terrazas, Benemérita Universidad Autónoma de Puebla, Edificio IF-1, Ciudad Universitaria, Puebla, Pue, 72570, Mexico;3. Departamento de Física, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, D.F., C.P. 11801, Mexico;4. Grupo de Materiales Ferroicos de la Facultad de Física - Instituto de Ciencia y Tecnología de Materiales, Universidad de La Habana, San Lázaro y L, 10400, Habana, Cuba;1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China;2. State Grid Smart Grid Research Institute Co. Ltd., Beijing, 102211, China;3. Sinoma Jiangxi Electric Porcelain Electrical Co., Ltd., Pingxiang, 337000, China |
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| Abstract: | This study examined the effects of rare-earth (RE) elements such as Sc, Y, Ce, and Yb on the densification and oxidation of SiC. After adding binary or ternary RE nitrates in liquid form to β-SiC, hot pressing was performed at 1750 °C for 2 h under 20 MPa. RE nitrate was transformed into RE oxide and formed a liquid phase during sintering by a reaction with SiO2 present on the SiC surface, where the total amount of RE oxide was fixed at 5 wt%. RE-based silicate melts acted as sintering additives without decomposing SiC at high sintering temperatures. SiC containing Sc–Y as an additive showed a much higher density (≥ 99%) than SiC containing the conventional Al–Y additive (∼95%). The multicomponent RE additive with a melting point (Tm) < 1550 °C had a relatively lower density than that with a higher Tm, owing to the evaporation of the additive at 1750 °C. The density of SiC also depended on the additive composition. The oxidation test, conducted at 1300 °C for up to 168 h in air, exhibited a parabolic weight gain. The SiC sample sintered with the Sc–Yb additive achieved the highest resistance of 3.23 × 10−5 mg/cm4·s. |
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| Keywords: | Hot pressing SiC Rare earth elements Oxidation |
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