TATB造型颗粒微细结构X射线亚微层析成像

Characterization of TATB Molding Powder by X-ray Sub-micron Tomography

利用X射线亚微层析成像技术无损研究了1,3,5-三氨基-2,4,6-三硝基苯(TATB)造型颗粒微细结构特征,获得了TATB造型颗粒的三维结构图,结果显示颗粒内部存在明显的、可定量的孔隙、涡环层、致密表层及高密度杂质等。分析表明,内部孔隙形态与分布受湍流作用模式影响;凝结涡旋环尺寸越小愈呈椭圆形,短长径比趋于0.7,涡耗散趋于稳形耗散;湍流涡扩展是致密表层形成的主要成因;高密度杂质靠近颗粒表面证明颗粒经历强旋转。

Fine structure characteristic of 2,4,6-triamino-1,3,5-trinitrobenzene（ TATB） molding powder was investigated by using X-ray sub-micron tomography. Three dimensional reconstruction images have been generated,from which obvious and quantifiable pores,vortex ring layers,dense surfaces and high density impurities can be observed inside the granules. It was revealed that the coagulated vortex rings with a smaller size have a tendency to possess elliptical shapes,with the ratio of the minor to major axes of the ellipses close to 0. 7 and the vortex dissipation to be stable. The formation of dense surfaces was mainly attributed to the spread of vortex. TATB molding powder may experience strongly rotating turbulence,as deduced from the fact that high density impurities located near the surface of the granules. The configuration and distribution of the interior pores were affected by the mode of turbulent flow during the granulation process.