热处理温度对碳纤维毡导电性能的影响

摘要

The polyacrylonitrile carbon felt was heated for 2 hours at 450--650 ℃ in air, respectively. The effect of heat-treatment temperature on surface state, structure and conductivity of the carbon felt were studied by scanning electron microscopy (SEM), Raman spectroscopy and resistance meter. The results show that the impurities' gradually disappeared and some defects, such as holes and grooves, appeared with the increase of the heat treatment temperature. The structure of carbon fiber gradually changed from planar turbostratie structure to three dimensional ordered structure. The conductivity of carbon felt raised and then decreased, and reached the maximum at 550 ℃.%将聚丙烯腈碳纤维毡在450－650℃下于空气中恒温处理2h，采用扫描电镜、拉曼光谱仪、电阻仪等研究了热处理温度对碳纤维毡的表面形态、结构、导电性能的影响。结果表明：随着热处理温度的升高，碳纤维毡表面存在的杂质逐渐分解消失，并出现空洞、沟槽等缺陷，碳纤维结构逐渐从二维的乱层结构转变为三维的有序结构；碳纤维毡的电导率先升后降，在550℃时达到最大值。