Eu stabilized α-sialon ceramics derived from SHS-synthesized powders |
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| Affiliation: | 1. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;2. The Center of Structural Ceramics, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;3. School of Physics and Materials Engineering, Monash University, Clayton, Victoria 3800, Australia;1. School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India;2. Laser Material Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China;2. Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Harbin Inst Technol, Condensed Matter Sci & Technol Inst, Harbin 150080, China;1. Brandenburg University of Technology Cottbus–Senftenberg, Konrad-Wachsmann-Allee 17, 03046 Cottbus, Germany;2. Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX13PU, United Kingdom;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2. College of Mechanical Engineering, Donghua University, Shanghai 201620, China;3. Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm SE-106 91, Sweden |
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| Abstract: | The characteristics of Eu-stabilized α-sialon ceramics derived from self-propagating high-temperature synthesis (SHS) Eu α-sialon powders without and with the addition of Y2O3 are investigated. The results showed that the amount of α-sialon phase formed in sintered Eu α-sialon composition was much less than that in SHS-ed powder when the composition was hot-pressed at 1800 °C for 1 h, while the transformation of α-sialon to β-sialon phase did occur at the same time, which could be attributed to the metastability of SHS-ed powder because of the high heating and cooling rate during the SHS process and the reduction of Eu3+ to Eu2+ under the reduction conditions during hot pressing. By addition of Y2O3 into SHS-ed Eu α-sialon powder, thus to form (Y,Eu) α-sialon phase in the sintered sample, the stability of α-sialon phase was improved, as the ratio of α-sialon to α-sialon was increased from 70 wt.% in SHS-ed powder to 83 wt.% in the sintered product by 50 mol% of Y2O3 added into SHS-ed powder. |
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