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各向同性沥青基碳纤维在结构上存在着不均匀性,既存在着有序排列程度较高的晶区,又存在着有序程度较低的非晶区。晶区由无规取向的片状微晶组成,微晶之间相互缠绕,并通过分叉形成网状结构。由发展不充分的微晶或无定形碳组成的非晶区镶嵌在微晶之间的“网眼”中。微晶的尺寸及有序化程度随着热处理温度的升高而增加。微晶大多存在着不同程度的弯曲或畸变,而弯曲或变畸的程度是由微晶中碳片层的大小及错排情况决定的。片层的错排分为两类,一类是若干片层在同一部位发生错排,从而构成亚晶界;另一类是片层错排混乱地分布在微晶中的不同部位,它导致微晶有序化程度的降低。
The isotropic pitch-based carbon fiber is structurally inhomogeneous, with both ordered regions with higher crystalline regions and lower ordered regions with amorphous regions. The crystalline regions consist of randomly oriented lamellar crystallites, which entangle with each other and form a network structure by bifurcation. Amorphous regions composed of underdeveloped microcrystals or amorphous carbon are inlaid in the “meshes” between the crystallites. The size and order of crystallites increase with the increase of heat treatment temperature. Most of the crystallites have different degrees of bending or distortion, and the degree of bending or distortion is determined by the size of the carbon layer in the crystallites and the mis-alignment. Layers of the wrong row is divided into two categories, one is a number of layers in the same place misplaced, which constitutes a subgrain; the other is the misplaced layers in the microcrystalline distribution of different parts, which led to The degree of crystallite ordering is reduced.