炭化条件对炭纤维纳米微孔分形维数的影响

应用X射线小角散射方法研究了炭纤维纳米微孔内表面 特征的分形维数D. 结果表明, 不同炭化温度下得到的炭纤维, 其微孔尺寸在1.60～4.13 nm. 随着炭化温度的升高（由900 ℃升至2 400 ℃）, D值增大（由2.09增加到2.59）. 当增大炭化牵伸率时, 微孔分形维数也有所增加. 从具有不同分形维数炭纤维力学强度的测试中发现, 分形维数较低的试样, 具有较高的拉伸强度和压缩强度.

Influence of Carbonification Condition on Carbon Fiber Nanometer Micropore Fractal Dimension

By means of small angle X-ray scattering, the fractal dimension D for carbonfiber nanometer micropore inner surface is studied. The results show that the size of the carbon-fibers obtained at different carbonification temperatures varies from 1.6 nm to 4.13 nm. And as the carbonification temperature goes up from 900 ℃ to 2 400 ℃, the value of D also goes up from 2.09 to 2.59. When the carbonification draft ratio is enlarged, the micropore fractal dimension will increase somewhat. By determining the mechanical intensity of the carbon-fibers which have different fractal dimension, it was found that those samples which have lower fractal dimension possess larger stretch intensity and condensation intensity.