In order to optimize the solidification process of DNAN-based melt-casting explosives, the temperature-time curves and solidification rate of DNAN solidification process under 0.6MPa, 0.3MPa and atmospheric pressure respectively were measured by a home-made pressured solidification multi-point type measuring device. The distribution of solidification defect of these solidification samples was observed by industrial CT and SEM, respectively. The charge density of these solidification samples was measured by density instrument. Results show that the undercooling and solidification rate increase gradually with increasing pressure. In DNAN charge, the volume shrinkage caused by solidification is more aggregated in the upper part of charge, while the diffuse solidification defect in the lower part of charge decrease significantly with increasing pressure. The orderliness of DNAN grain growth is improved, the space between grains is gradually reduced, and the relative density of charge increase from 95.1% to 96.7%. These results indicate that DNAN solidification process is significantly affected by pressure. The high quality DNAN charge can be achieved by applying a lower pressure on solidification process.
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罗一鸣,张蒙蒙,杨斐,等. 压力对DNAN凝固过程的影响[J]. 科学技术与工程, 2020, 20(8): 3048-3052. Luo Yiming, Zhang Mengmeng, Yang Fei, et al. Effect of Pressure on DNAN Solidification Process[J]. Science Technology and Engineering,2020,20(8):3048-3052.