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http://dx.doi.org/10.4191/kcers.2014.51.5.418

Sintering and Characterization of SiC-matrix Composite Including TRISO Particles  

Lee, Hyeon-Geun (Nuclear Materials Development Division, Korea Atomic Energy Research Institue)
Kim, Daejong (Nuclear Materials Development Division, Korea Atomic Energy Research Institue)
Park, Ji Yeon (Nuclear Materials Development Division, Korea Atomic Energy Research Institue)
Kim, Weon-Ju (Nuclear Materials Development Division, Korea Atomic Energy Research Institue)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.5, 2014 , pp. 418-423 More about this Journal
Abstract
Fully ceramic micro encapsulated (FCM) nuclear fuel is a concept recently proposed for enhancing the stability of nuclear fuel. FCM nuclear fuel consists of tristructural-isotropic (TRISO) fuel particles within a SiC matrix. Each TRISO fuel particle is composed of a $UO_2$ kernel and a PyC/SiC/PyC tri-layer which protects the kernel. The SiC ceramic matrix is created by sintering. In this FCM fuel concept, fission products are protected twice, by the TRISO coating layer and by the SiC ceramic. The SiC ceramic has proven attractive for fuel applications owing to its low neutron-absorption cross-section, excellent irradiation resistivity, and high thermal conductivity. In this study, a SiC-matrix composite containing TRISO particles was sintered by hot pressing with $Al_2O_3-Y_2O_3$ additive system. Various sintering conditions were investigated to obtain a relative density greater than 95%. The internal distribution of TRISO particles within the SiC-matrix composite was observed using an x-ray radiograph. The fracture of the TRISO particles was investigated by means of analysis of the cross-section of the SiC-matrix composite.
Keywords
FCM nuclear fuel; SiC ceramic; TRISO particle; Hot pressing;
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