Spectral investigations of the combustion of pseudo-nanoaluminized micro-cyclic-[CH₂N(NO₂)]₃in a shock wave

Abstract

Based on spectral investigation, the role of nanoaluminium in the combustion phase of pseudo-nanoaluminized micro-cyclic-[CH2N(NO2)]3 (RDX) induced by shock wave is determined. Time-resolved monochromatic emission spectra of AlO (Δν = −1, 0, +1 of X 2Σ+–B 2Σ+) indicated bimodal combustion behaviour as nanoaluminium burns in post-detonation of a nanoaluminized RDX (cyclic-[CH2N(NO2)]3) explosive under an Ar atmosphere, which is in accord with the theoretical reaction temperature. As oxygen replaces Ar, a single emission peak of AlO is observed. The morphology of the condensed products is evaluated by transmission electron microscopy and scanning electron microscopy. Analyses of x-ray diffraction and XPS are also performed, concluding that only nano-α-Al2O3 is present in the O2 atmosphere experiments, whereas in the Ar atmosphere, metastable γ- and θ-Al2O3 also exist. AlN is one of the condensed products in Ar atmosphere experiments, which should form at the end of combustion as γ-and θ-Al2O3.

Effects of Moisture Content on the Minimum Explosible Concentration of Aluminum Powder and the Related Mechanism

“…Powder. Ye et al [31] proposed an aluminum oxidation mechanism at room temperature, by which the Al 2 O 3 film could maintain the chemical stability of aluminum powder at room temperature. Briefly, the micron aluminum powder particles adsorb free oxygen as exposed to the air.…”

Effects of copper micro-particles on the detonation characteristics of RDX powder

“…Zhao and co-workers [17,18] have investigated the influence of metal powders on energetic material's thermal decomposition using PDSC or DSC methods and analysed the role of copper. Yet studies on the detonation characteristics of explosives containing metal particles under shock wave induction remain less reported [4,15,[19][20][21][22]. Furthermore, due to the short reaction time on the scale of microseconds, the change processes of intermediate or final products versus time were not easily studied by an ordinary monochromator.…”