In situ hot pressing/reaction synthesis,mechanical and thermal properties of Lu2SiO5 |
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| Affiliation: | 1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 110016 Shenyang, China;2. Science and Technology of Advanced Functional Composite Laboratory, Aerospace, Research Institute of Materials and Processing Technology, Beijing 100076, China;1. PG – Ciência dos Materiais, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA, Brazil;2. Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil;1. Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK;2. Surface Engineering, Rolls-Royce Plc, Derby, DE24 8BJ, UK;1. High-Performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China;3. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang, 110819, China;4. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China;1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland;2. Institute of Physics, Polish Academy of Sciences, Warsaw, Poland;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;1. Centre for Advanced Structural Ceramics, Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;2. School of Mechanical and Aerospace Engineering, Kingston University of London, SW15 3DW, United Kingdom;3. Centre for Nuclear Engineering, Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom |
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| Abstract: | Lu2SiO5 is a promising candidate of environmental barrier coatings (EBC) for silicon based ceramics due to its excellent high temperature stability. However, little information is available for the mechanical and thermal properties of Lu2SiO5, which frustrated evaluation of its performances for EBC applications. In this paper, dense Lu2SiO5 ceramic is successfully fabricated from Lu2O3 and SiO2 powders by in situ hot pressing/reaction sintering at 1500 °C. Mechanical properties, including Young's modulus, bulk modulus, shear modulus, Poisson's ratio, fracture toughness, Vickers hardness, and bending strength are reported for the first time. Lu2SiO5 possesses excellent high temperature mechanical properties up to at least 1300 °C. Thermal stress for the case of Lu2SiO5 or Y2SiO5 coating on silicon bond coat and thermal stress resistance parameter are also estimated based on the experimental mechanical and thermal properties. The present results suggest that Lu2SiO5 has better reliability than Y2SiO5 in harsh thermal environment. |
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| Keywords: | Rare-earth silicate Processing Mechanical property Thermal property EBC |
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