材料工程2026，Vol.54Issue(8)：19-30,12.DOI:10.11868/j.issn.1001-4381.2026.000286
中间相沥青碳纤维的氧化行为
Oxidation behaviors of mesophase pitch-based carbon fibers
摘要
Abstract
Mesophase pitch-based carbon fibers(MPCF)possess excellent properties,such as high modulus and high thermal conductivity,making them key strategic materials for national defense security and advanced equipment development.However,their oxidation behavior in high-temperature aerobic environments remains poorly understood.This study investigates the oxidation behaviors and the evolution of mechanical and thermal properties of two types of MPCF,namely split-structured(CF-A)and round-structured(CF-B),in both carbonized(1600℃)and graphitized(3000℃)states.The results show that CF-A-1600 exhibits preferential core oxidation during the 600℃oxidation process,leading to a tensile strength retention of only 34.93%,which is lower than that of CF-B-1600(51.79%).Conversely,the CF-A-3000 achieves tensile strength retention of 79.64%and thermal conductivity retention of 94.36%,respectively,higher than those of CF-B-3000(77.46%and 90.93%).For carbonized MPCF,the oxidation behavior is dominated by diffusion-controlled reactions,where structural morphology plays a decisive role,and CF-B fibers exhibit superior oxidation resistance.For graphitized MPCF,oxidation behavior is governed by chemical-controlled reactions,in which intrinsic crystallite activity becomes dominant.For comparison,CF-A fibers show superior performance due to their better-developed crystallites and consequently higher oxidation activation energy.This study reveals the coupled mechanism between structural morphology and intrinsic crystallite activity of MPCF,providing a theoretical reference for reliability assessment and material optimization design of MPCF and their composites in extreme thermal service conditions.关键词
中间相沥青碳纤维/微观结构/氧化行为/热导率/拉伸强度Key words
mesophase pitch-based carbon fiber/microstructure/oxidation behavior/thermal conductivity/tensile strength分类
通用工业技术引用本文复制引用
吴晃,全华锋,朱世鹏,叶崇,冯志海..中间相沥青碳纤维的氧化行为[J].材料工程,2026,54(8):19-30,12.基金项目
国家自然科学基金联合基金项目(U24B2027) （U24B2027）
