新型炭材料（中英文）2026，Vol.41Issue(4)：1040-1053,14.DOI:10.1016/S1872-5805(26)61113-4
TRISO包覆燃料颗粒多孔热解炭在高温处理下异常微观与介观结构演化
Revealing abnormal micro-and meso-structure evolution mechanism of porous pyrolytic carbon in TRISO coated fuel particles under high-temperature treatment
摘要
Abstract
Porous pyrolytic car-bon(PPyC)serves as the buffer layer in TRi-structural ISOtropic(TRISO)fuel particles,where it provides storage for fission gases,prevents damage to the outer lay-ers,and absorbs stresses caused by fuel-kernel swelling.However,the changes of the PPyC micro-and meso-structure at high-tem-peratures remains insufficiently understood.In this study,PPyC fabricated by chemical vapor de-position was heat-treated from 1200 to 1600 ℃ and character-ized across the atomic-to-meso-scopic scales.The results show that structure of the PPyC changes with temperature with a transition at approximately 1400 ℃.Below 1400 ℃,a decrease in the Raman peak ratio ID/IG,a narrowing of the graphite diffraction peak,and an increase in the amount of sp2 hybridization col-lectively indicate progressive ordering associated with defect redistribution.Concurrent decreases in true density and mesopore volume,together with increased closed porosity,are consistent with the partial conversion of open pores into closed pores.Above 1400 ℃,the increased ID/IG ratio,broadening of the diffraction peak near the position of the rhombohedral graphite(101)reflection planes,and transition regions between crystalline and amorphous material observed by transmission electron microscopy collectively indicate increasing structural disorder.Meanwhile,the initially distinct boundaries of the PPyC particles become blurred and appear to merge into broad,plate-like domains.The subsequent decrease in closed porosity and in-crease in mesopore surface area are consistent with partial connection of closed pores to the open-pore network.This work shows that the intrinsic coupling between atomic-scale structural change and mesoscale pore connectivity provides a basis for assessing the high-temperature structural stability of PPyC in TRISO fuel particles.关键词
TRISO包覆燃料颗粒/疏松热解炭/高温处理/过渡区/孔隙演化Key words
TRISO coated fuel particles/Porous pyrolytic carbon/High temperature treatment/Transition zone/Pore evolution分类
通用工业技术引用本文复制引用
雷锦宏,杨旭,程星,杨辉,张凯红,于浩,刘小雪,赵宏生,刘兵..TRISO包覆燃料颗粒多孔热解炭在高温处理下异常微观与介观结构演化[J].新型炭材料（中英文）,2026,41(4):1040-1053,14.基金项目
The material preparation for this work was sup-ported by the National Natural Science Foundation(52403404).The characterization work involved in this study was supported by the National S&T Major Project(ZX06901). 国家科技重大专项(ZX06901) （52403404）
国家自然科学基金项目(52403404). （52403404）
