TATB造型颗粒温等静压成型X射线微层析成像  

X-ray Microtomography of TATB Granules Under Isostatic Warm Compaction

作　　者：张伟斌[1] 田勇[1] 雍炼[1] 杨雪海[1] 戴斌[1] 李敬明[1] 陈华[1] ZHANG Wei-bin;TIAN Yong;YONG Lian;YANG Xue-hai;DAI Bin;LI Jing-ming;CHEN Hua(Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2018年第9期779-785,816,共8页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(11572294);国家自然科学基金NSAF重点基金(U1330202)

摘　　要：与传统钢模成型相比,温等静压成型是一种获得致密、均匀高聚物粘结炸药的更优方法,为温等静压成型高聚物粘结炸药精密物理性能研究提供细观结构基础,利用X射线微层析成像技术研究了三氨基三硝基苯(TATB)造型颗粒经温等静压成型圆柱样品的三维细观结构。结果显示,TATB造型颗粒经过温压后仍保留完整,典型形态呈多边体,压实颗粒间有高密度薄层、颗粒接触数最大达到12。CT图像分析表明,压实颗粒尺寸轴向分布保持不变,径向存在沿轴心方向的密度降和压力降;层面密度离散性高于1.15%,但体密度趋向均匀;分析内部力链分布情况,发现了温等静压成型过程TATB造型颗粒呈现等向压缩特征;基于细观颗粒接触角统计了颗粒接触数,证实了压实颗粒构形态及其排列趋向各向同性,但局部颗粒仍存在剪切压缩状态。Compared with the traditional die pressing,the isostatic warm compaction is a better way to obtain dense and homogeneous polymer bonded explosive(PBX).To provide a meso-level structure basis for the study of precise physical properties of PBX,three dimensional mesoscopic structure of the cylindrical sample formed by 2,4,6-triamino-1,3,5-trinitrobenzene(TATB)granules under isostatic warm pressing was studied by X-ray microtomography(X-μCT).The results reveal that TATB granules are still intact after warm pressing,and typically have polyhedral morphologies.There are high density layers between neighboring granules,and the maximum contact number of which is 12.An analysis of CT images shows that the axial size distributions of the compacted granules remain unchanged,whereas a decreasing trend of the radial density and pressure along the axial direction is observed.The CT values dispersion of different slices is larger than 1.15%,but the bulk density tends to be homogeneous.By analyzing the internal force chain distribution,we found an isotropic compression characteristic of compacted TATB granules under isostatic warm compaction.The particle contact number is counted based on mesoscopic particle contact angle,from which the morphology and arrangement of compacted particles have been confirmed to be isotropic,while the local particles subjected to shear-compression loading could also be detected.

关 键 词：三氨基三硝基苯(TATB)造型颗粒 温等静压 微细结构 X射线微层析成像 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]