High‐Performance and Insensitive DNTF‐DFTNAN Eutectic: Binary Phase Diagram and Characterization

Abstract

AbstractIn order to hunt for a high‐energy and insensitive eutectic, differential scanning calorimetry (DSC) method was used to investigate the melting process of DNTF‐DFTNAN co‐molten mixtures with different compositions. Based on the experimental T‐x phase diagram, the experimentally extrapolated molar ratio of DNTF‐DFTNAN eutectic mixture is 30.1/69.9, which is consistent with the result from the H‐x phase diagram, and the eutectic point is about 335.5 K, showing that the addition of DFTNAN can effectively reduce the melting temperature of DNTF. The FT‐IR and XRD measurements of raw DNTF, raw DFTNAN and the DNTF‐DFTNAN eutectic indicate that no chemical reaction occurred and the structure of crystal doesn't change during the preparation of the eutectic. The thermal decomposition temperatures at different heating rates and the apparent activation energy of eutectic are basically between DNTF and DFTNAN. The drop height (H50) for the DNTF‐DFTNAN eutectic increases by 27.4 cm (85.1%) compared with that of DNTF, and the detonation velocity decreases only by 0.5 km/s (5.5 %), implying that the DFTNAN can efficiently desensitize the DNTF explosive with a slight energy loss. In addition, the polynomial equations of mechanical sensitivity and detonation velocity with DNTF content were fitted to adjust the detonation performance and sensitivity of DNTF‐DFTNAN co‐molten mixture, which provides an opportunity to design DNTF‐DFTNAN expected melt‐cast explosives.