Characterization of SiC Ceramic Tube Prepared by the Combined CVI and CVD Process

Abstract:

SiC_f/SiC composites are one of the candidates for high temperature structural applications because of their high strength and corrosion resistance under severe conditions and stability under neutron irradiation [1~3]. A silicon carbide fuel cladding for the light water cooled reactors (LWRs) may allow a number of advances, including: the increased safety margins under transients and accident scenarios, such as loss of coolant accident; the improved resource utilization via a higher burn-up beyond the present limit of 62 GWd/MTU; and improved waste management [3~5]. Some components of SiC_f/SiC composite will be applied as tubular geometry for the high-temperature core parts. The proposed design of an advanced LWR fuel cladding, referred to as Triplex, consists of three layers: an inner SiC monolith, a central SiC_f/SiC composite, and an outer dense SiC evrionmental barrier coating. The inner SiC layer provides the strength and hermeticity to contain fission products. The SiC_f/SiC composite layer fabricated by the CVI process provides a pseudo-ductile failure mode. The outer SiC thin coating layer protects against corrosion [5]. The chemical vapor deposition (CVD) technique is an effective approach for the fabrication of SiC_f/SiC composite and coated SiC monolith [6]. To increase the homogeneity of the microstructure and the deposition rate of a SiC tube, the process parameters should be optimized and modified.

• Periodical: Advances in Science and Technology (Volume 94)
• Pages: 38-42
• DOI: https://doi.org/10.4028/www.scientific.net/AST.94.38
• Online since: October 2014
• Authors: Ji Yeon Park*, Dae Jong Kim, Weon Ju Kim
• Keywords: CVD, CVI, Rotation, SiC_f/SiC Composite, Tube

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