Abstract
RDX/aluminum composites were prepared by the spray-drying method with F2602 as a binder. The morphology and covering effect of composites were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of the processing parameters on the morphology of the samples was investigated. The impact sensitivity and thermal decomposition behavior of RDX/aluminum composites were also measured and analyzed. Optimal morphology of samples was achieved when the inlet temperature, nitrogen flow rate, and suspension feed flow rates were 80°C, 473 L·h-1, and 4.5 mL·min-1, respectively. In addition, RDX/aluminum composites with the same content were prepared by a coverage-mixing method for comparative analysis. Experimental results showed that the thermal sensitivity and the impact sensitivity of RDX/aluminum composites prepared by the spray-drying method were significantly lower than those of RDX/aluminum composites prepared by the coverage-mixing method.
Highlights
The addition of metal powder with high heat value to explosive composition is a known method to improve their efficiency
It is difficult to mix the aluminum particles and explosive particles evenly to obtain the aluminized explosives with excellent performance, due to the agglomeration of nanometer aluminum and the large particle size of the explosive
The F content of the RDX/Al composites prepared by the spray-drying method is greater than that of RDX/Al composites prepared by the coverage-mixing method, and the Al content is less
Summary
The addition of metal powder with high heat value to explosive composition is a known method to improve their efficiency. In particular, it plays an important role in enhancing their blast effect and underwater performances [1,2,3], due to the reaction with the decomposition products of the explosive and environmental components [4]. Spray-drying can control the composition and particle size of a product It has been extensively used in the preparation of energetic materials [15,16,17]. The RDX/Al composites were prepared by the spray-drying method successfully, and RDX in suspension was crystallized on nano-Al particles, which could reduce the agglomeration phenomenon. The morphology, crystal structure, surface element distribution, thermal decomposition, and impact sensitivity of RDX/Al composites were analyzed and investigated for comparison with the physical mixtures
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