Fabrication and Application in Dispersed Ceramic Nuclear Fuel of U3O8/ZrN Core-shell Structure Microspheres
A two co-axial capillary microfluidic device was built up for the preparation of highly spherical U3O8/ZrN microspheres with core-shell structure based on shell solidification by photo/thermal initiation polymerization.Precise control of the particle size and shell thickness of the U3O8/ZrN core-shell structure microspheres is achieved by adjusting the flow rates of the continuous phase and the flow rate ratio of the core phase to the shell phase in the microfluidic control system.A technology method is proposed to prepare U3O8/ZrN dispersed ceramic nuclear fuel pellets with high U3O8 volume fraction from U3O8/ZrN core-shell structure microspheres.The results show that the U3O8 particles are uniformly distributed in the ZrN matrix without particle agglomeration or adhesion in the prepared dispersed nuclear fuel pellets with a fuel phase volume fraction of up to 40.8％.The thermal conductivity of the dispersed ceramic nuclear fuel pellets is 53％higher than that of U3O8 fuel pellets,which effectively improves the thermal conductivity of the ceramic nuclear fuel.
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