降低炭纤维强度离散度的强磁场处理法

Application of High Magnetic Field to Lessen the Strength Dispersion of Carbon Fiber

采用8T、12T、16T的磁场分别对经过280℃处理的预氧化炭纤维进行处理,对制得的炭纤维采用小角X射线散射(SAXS)、氮气等温吸脱附、单丝拉伸、扫描电子显微镜(SEM)进行测试。结果表明磁场处理使炭纤维内部大孔洞的百分比含量分别降低了21%、14%、11%,外部孔洞的数量分别降低了9.80%、13.47%、15.10%。采用Weibull统计方法测得炭纤维的平均强度分别提高了3.4%、5.7%、8.4%,强度离散度系数分别降低为0.326、0.308、0.306,炭纤维单丝强度趋于均匀化。

Strength dispersion is one of the main problems that restrained the development of carbon fiber. In order to lessen dispersion, 8 T, 12 T, 16 T high magnetic fields were applied to the pre-oxidized carbon fiber（CF）. And the carbon fibers were measured by small angleX-ray scattering （SAXS）, nitrogen isothermal adsorption and desorption, monofilament tensile experiment, scanning electron microscope （SEM）. The results show that, by the induction of magnetic field, the percentage of macroscopic internal voids decreases to 21%, 14%, 11% and the number of external voids decreases by 9.80% , 13.47% , 15.10% , respectively. And the effect is enhanced as the magnetic field intensity increasing. Through Weibull statistics, it was found thal： average strength increases by 3.4 %, 5.7 %, 8.4 % respectively. Furthermore, the magnetic field lessens strength dispersion of CF and coefficiem of variation（CV） is 0.326, 0.308, 0.306 respectively.