银加载爆轰实验中生成的固体粒子表征

Characterization of solid-particle products in detonation experiment added coin silver

使用X射线衍射、扫描电子显微镜、X射线能谱、比表面和孔隙度等分析方法,对加载货币银爆轰实验生成样品的成分含量、粒子形貌、形成物相、金属银的晶粒度、比表面及孔隙度进行了分析.结果表明,银和铜在爆后的粒子中仍然为共熔体,相对金属银,晶格参数减小,生成银粒子的晶粒度为15.9～22.2 nm;由于高温高压和实验环境的影响,银粒子爆后和其他杂质粒子粘结在一起形成较大的颗粒,含有许多其他成分,氧化亚铁来源于爆炸罐的罐体,大量无定形碳粉来源于缺氧环境下炸药的不完全燃烧,铝和硅来源于实验装置.对生成样品的形貌分析证明了XRD对银晶粒度的分析结果.因为样品中含有较多量的碳粉,为了弄清对气体的吸附作用,对样品进行了比表面、孔隙度以及孔径分析.

The morphology,composition,structure,grain size,surface area,pore volume and pore size of the detonation products were characterized by using different techniques including the X-ray diffraction （XRD）,the scanning electron microscopy（SEM）,the X-ray photoelectron spectroscopy （EDS） and the specific surface area and porosity analysis.The results show that the lattice constant of the eutectic melt particle system composed by silver and a small account of copper is smaller than that of the pure silver.The XRD analyses indicate that the grain size of the silver particles in the eutectic melt system is 15.9～22.2 nm.The SEM analyses reveal that the bigger ellipsoid detonation product particles consist of some small smooth spherical silver particles and different components,the FeO in which comes from the detonation vessel,the amorphous carbon from the organic explosive combustion in the seal vessel,and the Al and Si from the detonation facility.The morphology investigations agree with the XRD analyses.To make it clear that the detonation products containing some carbon powder act as the role of adsorption,the surface area,pore volume and pore size were also discussed.