Pressureless sintering of fully ceramic microencapsulated fuels |
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| Affiliation: | 1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Nuclear Fuel Technology Department, KEPCO Nuclear Fuel, Daejeon 34057, Republic of Korea;1. Materials Science & Engineering Department, Idaho National Laboratory, Idaho Falls, ID 83415-2211, USA;2. Fuel Performance and Design Department, Idaho National Laboratory, Idaho Falls, ID 83415-6188, USA;1. Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA;2. GE Global Research Center, Schenectady, NY, 12309, USA |
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| Abstract: | ![]()
A new strategy was introduced to achieve high volume fraction of tristructural isotropic (TRISO) particles (> 35 vol%) in fully ceramic microencapsulated (FCM) fuels. The proposed strategy requires (1) applying a controlled coating of a SiC matrix on the TRISO particles, (2) forming the coated TRISO particles using cold isostatic pressing, and (3) sintering the formed sample without applied pressure. The strategy was very effective for preventing both the rupture of TRISO particles and matrix cracking during sintering. The thinner the coating layer, the higher the volume fraction of the TRISO particles obtained in the FCM pellets. However, when the coating thickness was extremely thin (≤ 133 μm), radial cracks were observed near the TRISO particles in the SiC matrix after sintering. The maximum TRISO volume fraction (∼35.3 %) was obtained when the coating thickness was ∼215 μm and the TRISO pellets had no cracks in the SiC matrix. |
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| Keywords: | Silicon carbide Pressureless sintering Fully ceramic microencapsulated fuels Thermal conductivity Tristructural isotropic particle |
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