粉末冶金技术2025，Vol.43Issue(2)：135-143,9.DOI:10.19591/j.cnki.cn11-1974/tf.2023110016
UO2/SiC全陶瓷微密封燃料制备及其高温导热性能
Preparation and high temperature thermal conductivity of UO2/SiC fully ceramic microencapsulated pellets
摘要
Abstract
A series of UO2/SiC composite fully ceramic microencapsulated(FCM)pellets were prepared by self-grinding spheroidization coating and spark plasma sintering.The parameters,such as heating rate,sintering temperature,sintering pressure,and SiC content,were regulated.The phase composition and structural characteristics of the pellets were observed by metallographic microscopy and scanning electron microscopy.The thermal conductivity(TC)of the pellets from room temperature to 1200℃was obtained by laser thermal conductivity meter.The effects of process parameters on the microstructure and TC of the pellets were discussed.The results indicate that,the UO2@SiC composite particles are nearly spherical and well coated.The SiC matrix in UO2/SiC composite pellets exhibits a three-dimensional interconnected network structure.The sintering pressure has a significant influence on the structural integrity of UO2 particles in the pellets.The sintering temperature has a significant influence on the morphology and relative density of the SiC matrix.When the relative density is lower than 95%,the sintering temperature has a greater effect on the TC of the fuel pellets;when the relative density is higher than 95%,the SiC content has a greater impact on the TC.The TC of the FCM pellets prepared in this study is increased by up to 256.6%compared with the pure UO2.关键词
事故容错燃料/全陶瓷微密封/芯块/热导率Key words
accident tolerant fuel/fully ceramic microencapsulation/pellets/thermal conductivity引用本文复制引用
段丽美,王明珊,高瑞,褚明福,王志毅,黄奇奇,谢良,胡凤云,钟毅,杨振亮,李冰清,许靖堃..UO2/SiC全陶瓷微密封燃料制备及其高温导热性能[J].粉末冶金技术,2025,43(2):135-143,9.基金项目
国家自然科学基金资助项目(51604250,U20B2021,U22B20129,52174348,52072322) （51604250,U20B2021,U22B20129,52174348,52072322）
核能开发项目(HNKF202001) （HNKF202001）
中物院基金资助项目(JMJJ202101) （JMJJ202101）
