论文部分内容阅读
先驱体聚碳硅烷的纺丝工艺是制备高性能连续SiC纤维过程的关键环节,纺丝工艺决定了原丝的性能优劣,而纺丝工艺对聚碳硅烷原丝的损伤程度也将决定最终的SiC纤维性能。为此,利用扫描电子显微镜对整桶纺出原丝的直径、表面和截面缺陷进行了观察,利用统计方法对直径和缺陷的分布进行了分析。研究发现:原丝平均直径从外层到内层大体呈减小的趋势,并且每层数值波动逐渐减小,靠近中间层的原丝直径与整体平均值最为接近。表面划痕由外层到内层划痕逐渐减少。鼓泡在各层之间呈均匀分布。断面气孔主要集中在最外几层原丝中。根据统计结果得到了结构特征分布模型,建立了评价整桶原丝性能优劣的有效方法。
The precursor polycarbosilane spinning process is a key step in the preparation of high performance continuous SiC fibers. The spinning process determines the performance of the precursor, while the degree of damage to the polycarbosilane precursor will also determine the final SiC fiber properties. For this reason, the diameter, surface and cross-sectional defects of the whole barrel spun yarn were observed by using a scanning electron microscope, and the distribution of diameters and defects was analyzed by statistical methods. The results show that the average diameter of the original filaments tends to decrease from the outer layer to the inner layer, and the numerical fluctuation of each layer gradually decreases. The diameter of the primary filament near the middle layer is closest to the overall average value. Surface scratches from the outer layer to the inner scratch gradually reduced. Bubbling was evenly distributed between the layers. Stomata are mainly concentrated in the outermost layers of raw silk. According to the statistical results, the structural feature distribution model is obtained, and an effective method to evaluate the performance of the whole drum is established.