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Microstructure and high-temperature strength of silicon carbide with 2000 ppm yttria
Affiliation:1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. National Institute for Materials Science, Ibaraki 305-0044, Japan;3. Department of Materials Modelling and Characterization, Korea Institute of Materials Science, Changwon 51508, Republic of Korea;1. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;1. School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai 201210, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;3. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100039, China;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Roorkee, Roorkee, India;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, the University of Seoul, Seoul, Republic of Korea;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea
Abstract:A dense silicon carbide (SiC) ceramic with a very high flexural strength at 2000 °C (981 ± 128 MPa) was obtained by conventional hot-pressing with extremely low additive content (2000 ppm Y2O3). Observations using high-resolution transmission electron microscopy (HRTEM) showed that (1) homophase (SiC/SiC) boundaries were clean without an intergranular glassy phase and (2) junction pockets consisted of nanocrystalline Y-containing phase embedded in an amorphous Y-Si-O-C-N phase. The excellent strength at 2000 °C was attributed to the clean SiC/SiC boundary and the strengthening effect of plastic deformation.
Keywords:Silicon carbide  Mechanical properties  High temperature strength  Microstructure  Yttria
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