High-Performance and Insensitive Dftnan-Dntf Eutectic: Binary Phase Diagram and Melting Kinetics

Abstract

In this article, a high-energy and insensitive eutectic mixture was prepared by melting 3, 5-difluoro-2, 4, 6-trinitroanisole (DFTNAN) and 3, 4-bis (3-nitrofurazan-4-yl) furoxan (DNTF). Differential scanning calorimetry (DSC) method was used to investigate the melting process of DFTNAN-DNTF co-molten mixtures with different compositions. Based on the obtained T - x phase diagram, the extrapolated molar ratio of DFTNAN-DNTF eutectic mixture is 69.9/30.1, which is consistent with the H - x phase diagram, and the eutectic point is 335.5 K. The melting kinetics of DFTNAN-DNTF eutectic mixture satisfies the Šatava-Šesták relationship and exhibits a second-order recombination mechanism. The measured characteristic drop height (H 50 ) for the DFTNAN-DNTF eutectic is 59.6 cm, and the calculated detonation velocity is 8.74 km/s, implying that the DFTNAN-DNTF system is superior to the existing melt-cast explosive carriers. By using the fitted polynomial equations of mechanical sensitivity and detonation velocity with DNTF content, both the detonation performance and sensitivity of DFTNAN-DNTF co-molten mixture can be adjusted.

Keywords: Melt-cast explosive, DFTNAN-DNTF eutectic, Binary phase diagram, Melting kinetics, Sensitivity