U3O8/ZrN核壳结构微球制备及其在弥散型陶瓷核燃料中的应用研究
Fabrication and Application in Dispersed Ceramic Nuclear Fuel of U3O8/ZrN Core-shell Structure Microspheres
舒瀚东 1周何 1马千驰 1郝彬琦 1常振旗1
作者信息
- 1. 中国科学技术大学核科学与工程系,合肥 230026
- 折叠
摘要
基于光/热引发聚合反应的壳层固化方法在设计构建的同轴双毛细管微流体控制装置中实现高球形度U3O8/ZrN核壳结构微球的制备,调控微流控系统中连续相流量以及核相与壳层相流量比可精准控制U3O8/ZrN核壳结构微球粒径和壳层厚度.提出以U3O8/ZrN核壳结构微球为原料制备高U3O8体积分数的U3O8/ZrN弥散型陶瓷核燃料芯块技术方法.研究结果显示,制备的高达40.8％燃料相体积分数的弥散燃料芯块中U3O8微粒均匀分布在ZrN基质中且没有U3O8微粒堆积粘连.该弥散燃料芯块的热导率比U3O8燃料芯块热导率提高53％,有效改善了陶瓷核燃料的导热性能.
Abstract
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.
关键词
微流控技术/氧化铀/氮化锆/核壳结构微球/弥散型核燃料Key words
Microfluidic/Uranium oxide/Zirconium nitride/Core-shell structure microspheres/Dispersed nuclear fuel引用本文复制引用
基金项目
国家自然科学基金面上(21978279)
安徽省重点研究与开发计划项目(201904a05020048)
出版年
2024
NETL
NSTL
万方数据