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研究了Fe离子在石墨化过程中对聚丙烯腈基碳纤维结构与性能的影响。采用不同浓度的FeCl3溶液对碳纤维进行浸渍,并在2500℃进行高温处理。通过扫描电镜、X射线衍射、体密度、力学性能等测试手段考察了碳纤维的结构和性能。结果表明,经过高温处理后,Fe离子具有催化石墨化效应,促进了碳纤维从乱层结构向石墨结构的转变;碳纤维微晶尺寸、层间距、弹性模量增加,表面形态也得到改变。同时,Fe引起碳元素的流失,高温处理后体密度降低、碳纤维的缺陷增加,导致抗拉强度降低。
The effect of Fe ions on the structure and properties of polyacrylonitrile-based carbon fibers during graphitization was studied. Carbon fibers were impregnated with different concentrations of FeCl3 solution and subjected to high temperature treatment at 2500 ° C. The structure and properties of carbon fiber were investigated by scanning electron microscopy, X-ray diffraction, bulk density and mechanical properties. The results show that the Fe ion has the effect of catalytic graphitization after high temperature treatment, which promotes the transformation of carbon fiber from chaos to graphite structure. The size, interlayer distance and elastic modulus of carbon fiber increase, and the surface morphology also changes. At the same time, Fe caused the loss of carbon, the body density decreased after high temperature treatment, and the defects of carbon fiber increased, resulting in the decrease of tensile strength.