碳纤维表面微观结构的定量化表征方法

通过使用Matlab编程处理日本东丽T300、国产GCF-1和GCF-2等3种碳纤维样品断面的扫描电镜照片,采用二值标签算法获得了碳纤维的直径及圆度等碳纤维物理特征定量数据。建立了采用直线方程切线法寻找并计算碳纤维表面沟槽的数量及尺度的方法,发现3种碳纤维样品的边缘沟槽的深度及宽度的分布均符合Weibull分布的特征。3种碳纤维的表面物理特征随温度变化的规律相同,说明其在结构上存在着一致性。经过不同温度热处理后3种碳纤维样品的圆度值变化不大,平均直径随着热处理温度的升高逐渐减小,并且表面沟槽的数量及分布的变化规律相同,说明其结构存在一致性。3种碳纤维的圆度等表面物理特征存在一定差异,T300的圆度小于国产GCF-1及GCF-2碳纤维。

Quantitative Image Processing Method for SEM Micrographs of Carbon Fiber

A study of image processing and data analysis of SEM micrographs of T300,GCF-1 and GCF-2 carbon fiber samples was described in this paper.A Matlab program compiled in this study was employed to study the section patterns of carbon fibers.The diameter,roundness,quantity and scale of grooves on carbon fiber surface can be obtained by image processing and data analysis method established in this research.A Weibull distribution of the grooves on the surface of all three kinds of CF samples was discovered.The evolution of the surface properties during heat treatment up to 2 500℃ showed the similarity of the CF’s structure.The roundness of T300 carbon fiber is less than GCF-1 and GCF-2.By using this methodt,he physical properties of carbon fiber’s surface can be quantitative-ly characterized.