Fabrication of highly dense three-layer SiC cladding tube by chemical vapor infiltration method |
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Authors: | Pengfei Tao Yiguang Wang |
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Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an, PR China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, PR China |
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Abstract: | Three-layer silicon carbide (SiC) cladding architectures are considered to be promising materials for current light-water nuclear reactors. Herein, a novel processing approach was proposed to fabricate dense three-layer SiC tubes by introducing SiC nanowires (NWs) on the graphite rod, which resulted in change in the valley-peak structure of SiCf tubular preform. A dense three-layer-NWs SiC cladding tube, consisting of a chemical vapor infiltration (CVI)-SiC inner layer, a CVI-SiCf/SiC composite layer, and a CVI-SiC outer layer, was obtained through CVI process. Microstructure and hoop strength of the as-obtained three-layer-NWs SiC cladding tube were systematically investigated. By avoiding delamination of the layers and reducing the pores, the three-layer-NWs SiC cladding tube exhibited an average hoop strength of 316.6 MPa with a Weibull modulus of 11.55. |
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Keywords: | fuel cladding hoop strength SiC nanowires SiCf/SiC composites Weibull modulus |
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