Effect of long-term oxidation on creep and failure of Si3N4 and Si3N4/SiC nanocomposites |
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| Affiliation: | 1. TU Hamburg-Harburg, Materials Physics Group, D-21071 Hamburg, Germany;2. Fraunhofer-Institute for Ceramic Technologies and Sintered Materials (IKTS), D-01277 Dresden, Germany;1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Ion Beam Development and Application Section, RIB Group, Variable Energy Cyclotron Centre, HBNI, 1/AF Bidhannagar, Kolkata 700064, India;2. Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata 700064, India;1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, PR China;2. Delta Aluminum Corporation, Zhaoqing, Guangdong Province 526299, PR China;1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravska cesta 9, 845 36, Bratislava, Slovakia;2. NPU-SAS Joint Research Center, School of Materials Science, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China;3. Notre Dame Integrated Imaging Facility, University of Notre Dame, Notre Dame, IN, 46556, United States;4. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, United States;1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, China;2. Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, 361005, China;3. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, China |
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| Abstract: | The high-temperature mechanical behaviour of an Si3N4/SiC nanocomposite and its monolithic Si3N4 reference material was studied after long-term oxidation treatments intended to simulate future operating conditions in a severe environment. Creep and failure at elevated temperature were significantly affected, in the direction of increased brittleness. The transition stress between the ductile range present at low stresses and the brittle range existing at high stresses was shifted to distinctly lower values. The creep resistance in the low-stress range was increased by the oxidation treatment. The failure time under a given stress was drastically reduced; this was attributed to an increased sensitivity to subcritical crack growth. The failure stress for a given failure time was decreased by about half. The phenomena are explained in terms of a purification of the intergranular phase and by the formation of surface defects and of a uniformly distributed pore population. |
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