多孔材料内部结构的微CT扫描仪分析

MICRO-CT SCANNING ANALYSIS FOR INNER STRUCTURE OF POROUS MEDIA

本文介绍使用微CT扫描仪对样品进行扫描和图像重构的原理,以蛋糕为样品使用CT对多孔材料的内部结构进行研究,包括样品的孔隙率及其变化,水在大孔内的分布,空腔的三维重构图像和样品内部其它微细特征。结果表明, 浸水的样品在干燥后,骨架收缩,部分孔的尺寸明显增大,孔隙率增加,而没有浸水的蛋糕在干燥前后结构变化不大。文章表明,对于孔径大于几十微米的多孔性材料,使用文中的微CT扫描仪可以有效地对它们进行内部结构的研究。

A micro-CT scanner was employed to investigate inner structure of porous media, including porosity and its variation in the samples, pore reconstruction, water distribution in big pores and other inner characteristics, and particularly cakes were taken as samples. When the sample was dried after being immersed in water, the solid frame shrank, some pores became larger, and the porosity increased, while the sample without being immersed in water did not change much after dried. The experiments indicate that micro CT scanning is an effective technology to study the inner structure of porous materials with pores lager than tens of microns.