Preparation of Annular Uranium Dioxide Fuel Pellets by Gel-casting Molding
MA Liang1, YANG Jing2, WANG Jiping1, XU Kui2
1 State Key Laboratory For Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China; 2 Key Laboratory for Reactor Fuel and Materials, Nuclear Power Institute of China, Chengdu 610041, China
Abstract: Annular uranium dioxide pellets have many advantages in increasing reactor power density. In this paper The Annular Uranium dioxide fuel pellets is gel-mould cast with N-methylolacry system. The influence of pH value and solid phase content on the viscosity of the slurry was stu-died. At the same time, the effect of monomer/crosslinker ratio, premix/initiator ratio on slurry gel solidification was studied. On this basis, the annular UO2 fuel pellets were prepared by gel-casting, and the green pellets were dried and sintered. The results show that when the solid content is 58vol%, pH=9.5, it can prepare high-solid content and low viscosity UO2 ceramic slurry. When the mass ratio of monomer/crosslinker is 15/1, the premix/initiator volume ratio is 100/2, gel curing processing is best. The annular pellet green body with wall thickness of 2.5 mm and 1.5 mm was prepared, and the wall thickness after sintering was 2.0 mm and 1.2 mm respectively; the indexes such as sintered density and grain size met the technical requirements.
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2020, Vol. 34 
