Jinhui Tan,Rongxia Huang,Hua-Tay Lin,Malin Liu,Bing Liu,Rongzheng Liu
A novel gel-casting process for fabrication of the fully ceramic microencapsulated (FCM) fuel with high TRISO particles loading capacity was proposed. In the gel-casting process, silicon carbide (SiC) ceramic was used as matrix, and low toxic N-methylol acrylamide was used as organic monomer with appropriate proportion of cross-linking agent, dispersant , and initiator to achieve the strength of green bodies. FCM fuel pellets with high TRISO particles loading capacity were successfully prepared by SPS process. By using the gel-casting method, the volume fraction of TRISO particles could reach 57%, and the average distance between TRISO particles in a plane was 52.4 μm, which could avoid TRISO particles damage introduced by direct contact between the particles. The structure of SiC matrix was dense and complete, and there was a coherent contact between the matrix and TRISO particles, which ensured the performance and reliability of FCM fuel.
Lei Fu,Rongxia Huang,Rongzheng Liu,Chaohua Liu,Hua-Tay Lin,Malin Liu,Bing Liu
Large-sized fully ceramic microencapsulated (FCM) nuclear fuel pellets were fabricated by a novel tape casting process in this study. The process involved producing a single layer of FCM fuel green tapes embracing TRISO particles by tape casting with silicon carbide ceramic as the matrix. The resulting tapes were stacked vertically and made into green bodies through cold isostatic pressing . Large-sized FCM fuel pellet with diameters over 86 mm was then successfully prepared by pressure-less sintering with AlN-Y 2 O 3 -Sc 2 O 3− MgO as sintering additives. The FCM fuel pellets obtained through this method exhibited a dense structure, flat surface, and no cracks. Thus, the integrated formation of the fuel-free zone and fuel-filled zone could be realized by precisely controlling the fuel-free zone thickness. The TRISO particles were regularly and uniformly distributed in a triangular shape and remained structurally intact. By adjusting the spacing of the TRISO particles in the FCM fuel pellets to a range of 500 to 1500 μm, the volume fraction of fuel particles in the FCM fuels was controlled between 12.8 and 31.7 vol.%.
危险品化学品经营许可证（带存储）