Fabrication of two-layer SiC nanowire cladding tube with high thermal conductivity |
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| Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, PR China;3. Institute of Advanced Structure Technology, Beijing Institute of Technology, Haidian District Beijing, 100081, PR China;1. OASIS, Muroran Institute of Technology, Muroran, Hokkaido, Japan;2. Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan;1. Karlsruhe Institute of Technology, Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany;2. Karlsruhe Institute of Technology, Institute for Micro Process Engineering, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany;1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831, USA;2. General Atomics, P.O. Box 85608, San Diego, CA, 92121, USA;1. Oak Ridge National Laboratory, Oak Ridge, TN, USA;2. University of Tennessee, Knoxville, TN, USA;3. General Atomics, San Diego, CA, USA |
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| Abstract: | Among the various concepts of SiC-based accident-tolerant fuel cladding, duplex SiC cladding, consisting of an inner composite layer and an outer monolithic SiC layer, is considered an optimal design due to its low load failure probability. In this study, SiC nanowires (SiCnw) were introduced on the substrate graphite rod to decrease the diameter of architectural valley-regions of SiC fiber (SiCf) tubular preform. By avoiding the architectural valley-voids, a dense two-layer SiCnw tube consisting of an inner SiC fiber-reinforced SiC matrix (SiCf/SiC) composite layer deposited by chemical vapor infiltration with a smooth inner surface was obtained. The microstructure and thermal properties of as-obtained two-layer SiCnw tubes were studied. Results showed that the thermal conductivity of the whole tube was highly sensitive to variations in thermal conductivity of the inner composite layer. By improving the thermal conductivity of the inner composite layer, the two-layer SiCnw tube exhibited a thermal conductivity of 23.8 W m−1 K−1 at room temperature, which had an improvement of 71 % compared to the two-layer SiC tube (13.9 W m−1 K−1). Moreover, the thermal transport properties of the two-layer SiCnw tube were significantly improved by a reduction in roughness of the inner surface. |
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| Keywords: | Fuel cladding Thermal properties SiC composites SiC nanowires |
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