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Fabrication of two-layer SiC nanowire cladding tube with high thermal conductivity
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2020-03-25 , DOI: 10.1016/j.jeurceramsoc.2020.03.040
Pengfei Tao , Wen Liu , Yiguang Wang

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.



中文翻译:

高导热率的两层SiC纳米线包覆管的制备

在基于SiC的耐事故燃料包层的各种概念中,由内部复合层和外部整体SiC层组成的双相SiC包层由于其低的负载失效概率而被认为是最佳设计。在这项研究中,SiC纳米线(SiCnw)被引入到基底石墨棒上,以减小SiC纤维(SiC f)管状预成型件的建筑谷底区域的直径。通过避开建筑的山谷空洞,可以形成由内部SiC纤维增强的SiC基体(SiC f获得通过具有光滑内表面的化学气相渗透沉积的/ SiC)复合层。研究了所获得的两层SiCnw管的显微组织和热性能。结果表明,整个管的热导率对内部复合层的热导率变化高度敏感。通过提高内部复合层的导热系数,两层SiCnw管在室温下的导热系数为23.8 W m -1 K -1,与两层SiCn管相比,提高了71%( 13.9瓦m -1 K -1)。此外,通过减小内表面的粗糙度,大大改善了两层SiCnw管的热传输性能。

更新日期:2020-03-25
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