Creep behaviour of two sintered silicon nitride ceramics |
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| Affiliation: | 1. Department de Fı́sica de la Materia Condensada, University of Seville, Seville, Box 1065, 41080 Spain;2. CFI, Ceramics for Industry, Rödental, Germany;1. School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224002, PR China;2. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, PR China;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;3. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA |
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| Abstract: | The high temperature mechanical properties of two sintered silicon nitride—based ceramic materials with different microstructural features, labelled N7202 and N3208, are presented. The mechanical behaviour was examined by creep tests in compression, at temperatures between 1450 and 1700 °C in argon atmosphere. The results, analysed in terms of the creep equation, yield n=0.6±0.1 and Q=470±20 kJ/mol for N7202, and n=0.6±0.1 and Q=530±10 kJ/mol for N3208. The microstructural observations allow identify a possible microscopic deformation mechanism compatible with the set of creep parameters obtained experimentally. |
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