Preparation and performance characterization of DFDNTN/TNAZ Low Eutectics

This study used a novel fluorine-containing melt casting carrier explosive, DFDNTN (5-fluoro-3-methyl-2,4-dinitrophenylamine), and a typical melt casting carrier explosive, TNAZ, to form a low eutectic. When TNAZ:DFDNTN = 6:4, a low eutectic with a melting point of 88°C can be formed; it also has a high decomposition temperature. This eutectic has good compatibility with high-energy explosives RDX and HMX. The difference in the values of the high temperature of the low-eutectic material with RDX and HMX is less than 2°C and its constant-temperature experimental weight loss rate at 100°C for 360 min can be significantly improved compared with that of single component TNAZ. At 100°C for 360 min, the weight loss rate of DFDNTN is 15%, and the weight loss rate of TNAZ reaches 93%, almost completely losing weight. For TNAZ:DFDNTN = 6:4, the weight loss rate is 53 %. Its safety indexes are FS ≥ 324 and IS>20, and the theoretically calculated detonation velocity is vD = 8196 m s−1. Crystal cross-section tests demonstrate that, compared with conventional TNT carrier explosive, the eutectic features a denser packing structure and more uniform grain size, which is beneficial to the compactness and mechanical properties of explosives; its higher viscosity relative to TNT may account for its superior molding performance.