PAN碳纤维高温热传输性能表征-中国材料进展

文章信息/Info

Title:: Evaluation of Thermal Transmission Properties of PAN Carbon Fiber at High Temperature

Author(s):: He Fengmei Li zhongping Feng Zhihai Chen Conghui Li Qi Wang Xiaoye; (Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials ＆Processing Technology ，Beijing 100076)

摘要:: 采用激光脉冲方法，通过平行集束、切割、打磨等系列措施制备了合格样品。对两种含碳量略有不同的PAN T300级碳纤维，分别测试获得了100～800 ℃表面上浆剂脱除、1 300～1 800 ℃的非碳元素脱除、1 800～2 500℃碳结构调整和100～2 700 ℃碳结构优化等四个不同阶段的热扩散率和热导率实测数据。结果表明：除浆阶段，热扩散率缓慢减小，热导率缓慢增加；非碳脱除阶段，热扩散率和热导率急剧增加；调整阶段，热扩散率和热导率增速比非碳脱除阶段明显降低，但比除浆阶段增速大；经2 500 ℃处理后，再进行100 ℃～2 700 ℃测试，其热扩散和热导率随温度变化规律与C/C和石墨类材料相同，数值比原始状态的碳纤维增大了约20倍。经XRD微晶尺寸分析，进一步说明了其热传导机制主要受非碳杂质含量和结构有序化程度控制。

Abstract:: The thermal diffusivity of two kinds of T300 carbon fiber containing different carbon was measured by laser flashing method at temperature 100～2 700 ℃, and the crystallographic parameter was measured by Xray diffraction (XRD) using the Rietveld method after high temperature testing. The results show that thermal diffusivity decreases slowly and thermal conductivity increases in the stage of taking off the resin around the carbon fiber at 100～800 ℃, and the thermal diffusivity and thermal conductivity increase synchronously at 1 300～1 800 ℃ in noncarbon going off stage. Comparing noncarbon going off stage, thermal diffusivity and thermal conductivity in carbon configuration adjusting and optimizing stage increase more slowly at 1 800～2 500 ℃. After 2 500 ℃ treatment the thermal diffusivity and thermal conductivity are similar to those of C/C and graphite, and the datas of the thermal conductivity increase almost 20 times than the original carbon fiber in 100～2 700 ℃.