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含能材料  2015 

TATB和HNS超细炸药的微结构和分形特性

DOI: 10.11943/j.issn.1006-9941.2015.12.009

Keywords: 超细炸药 六硝基茋(HNS) TATB 微结构 团聚体 吸附等温线 分形分析

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Abstract:

采用溶剂-非溶剂重结晶方法制备了TATB超细炸药和六硝基茋(HNS)超细炸药,对其微结构行了扫描电镜测试、比表面积测试、氮气吸附法分析和分形分析。结果表明,HNS超细炸药是由腰果状纳米颗粒以或紧密或疏松方式堆积而成的团聚体,比表面积为11.8 m2·g-1。TATB超细炸药是由纳米颗粒互相连接而成的团聚体,比表面积24.77 m2·g-1。氮气吸附结果显示,HNS和TATB两个样品均呈现Ⅳ型吸附曲线,滞后环均位于相对压力较高的区域。Barrett-Joyner-Halenda(BJH)和Horvaih-Kawazoe(HK)曲线显示,在孔径12?以下和80?以上区域中,TATB样品的孔体积和表面积大于HNS样品,在孔径12~80?区域则相反,由此可见TATB的高孔体积和高表面积源于微孔区的作用,而非介孔区的作用。两个样品的吸附曲线均展现出分形微结构,分维数在p/p0处于0.005~0.04区间较低,在p/p0处于0.04~0.10区间中等,在p/p0处于0.1~0.2区间则较高,这三个区间里,TATB样品的分维数均都高于HNS样品。与样品表面积数据相比,BJH、HK数据和分形分析提供的微结构信息更为详细,这将有助于对超细炸药团聚体微结构和微结构-性能关系的理解

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