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对比研究了入射激波诱导下纳米铝粉和微米铝粉与环氧丙烷混合物快速反应系统中的爆炸特征.利用多台单色谱仪同步采集技术实验测定了二种反应混合物在不同诱导激波中强度作用下的点火延迟时间.为获得爆炸系统内部信息利用扫描电子显微镜(SEM),X射线衍射分析仪(XRD),X射线能谱(XPS)对相应铝粉反应生成物的结构、态貌、表面氧化层厚度进行了表征和分析.结果表明:TEM结果表明纳米铝粉生成物为絮状、针状和纤维状,而微米铝粉生成物为球状且体积增大;XRD结果显示在压缩区、点火区、燃烧区、爆炸区、传播区、碎片压缩致冷区生成物中有α,γ,ε,δ一系列氧化铝的不同相,这是由于相同诱导激波强度作用下纳米铝粉较微米铝粉反应剧烈,其反应温度沿激波管截面轴向降低,导致不同的氧化铝相在相应区域生成;XPS结果表明纳米铝粉生成物表面氧化层厚达35nm,氧化程度达92%;而微米铝粉生成物表面氧化层厚度为30nm,氧化程度为65%.这些结果揭示了二个爆炸系统内铝粒子的点火和燃烧机理完全不同,这对含能材料添加剂的研究有重要意义.
The characteristics of explosion in the rapid reaction system of nano-scale aluminum powder and micron aluminum powder with propylene oxide were investigated by using contrast-induced shock waves.The simultaneous determination of two kinds of reaction mixtures in different induced shock waves In order to obtain the internal information of the explosion system, the structure and morphology of the corresponding aluminum powder reaction products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) , The thickness of the surface oxide layer were characterized and analyzed.The results showed that: TEM results show that the nano-aluminum powder products are flocculent, needle-like and fibrous, and the micron aluminum powder is spherical and the volume increases; XRD results show that in the compression A series of different phases of α, γ, ε, δ alumina in the products of zone, ignition zone, combustion zone, explosion zone, propagation zone and fragment compression refrigeration zone are due to the same intensity of induced shock wave, The reaction of powder with aluminum powder was fierce, and the reaction temperature decreased along the axial direction of the shock tube, resulting in the formation of different alumina phases in the corresponding regions. The XPS results showed that the surface oxide layer of nano- The degree of oxidation is 92%, while the surface oxide layer thickness is 30nm and the oxidation degree is 65% for the micron aluminum powder.These results reveal that the ignition and combustion mechanisms of aluminum particles in two explosive systems are completely different, The research is of great significance.