不同变质程度煤的高分辨率透射电镜分析

摘要

利用高分辨率透射电子显微镜（ HRTEM）分析了三种不同变质程度煤样的结构特征。基于傅里叶-反傅里叶变换方法，并结合Matlab、Arcgis和AutoCAD软件，通过图像分析技术，获得了HRTEM照片的晶格条纹参数。结果表明，三种煤样的晶格条纹呈现不同特征，按条纹长度分别归属于1×1－8×8共计八个类型。以3×3为临界点，在1×1和2×2中，ML-8中芳香层片的比例高于DP-4和XM-3；在3×3－8×8中，ML-8中芳香层片的比例低于DP-4和XM-3。对比HRTEM和XRD参数d002发现，随着镜质组反射率的增加d002都呈现递减趋势。%The stur ctural characteristics of 3 coals with different metamorphic degrees were analyzed using ih gh-resolution transmission electron microscpo y ( HRTEM ) . Applying FFT-IF T method, in association with M atlab, Arcgis and AutoCAD softwares, the lattice fringe parametre s obtained from HRTEM imga e were determined using image analysis.The results indicate that the lattice fringes of all the test coal samples exhibit d ifferen t characteristics.These lattice fringes can be divided into 8 types (1×1-8×8 aromatic frineg s) according to the frni ge length distribution.Taking the 3 ×3 aromatic fringe as critical point, the sampel ML-8 abundant in 1 ×1 and2 ×2 aromatic fringes while short of 3 ×3-8 ×8 aromatic fringes whe n com paring with sampleD P-4 na d sample XM-3.The values of d002 obtained from both HRTEM and XRD show a decreasni g trend wiht increasing vitrinite refel ctance.