Thermal decomposition kinetics and compatibility of NH3OHN5

Abstract Hydroxylammonium cyclo ‐pentazolate (NH 3 OHN 5 ), as one of the poly‐nitrogen compounds, has a broad prospect in the field of energetic materials, due to its high specific impulse, high detonation velocity, and the pollution‐free products. In this paper, the thermal decomposition behavior of NH 3 OHN 5 was studied by differential scanning calorimetry (DSC) using four heating rates (2, 5, 8, 10 °C min −1 ). The apparent activation energy (E K,O =114.31 kJ mol −1 ), the pre‐exponential factor ( A K =4.78×10 11 s −1 ) and the critical temperature of the thermal explosion ( T b =108.08 °C) of NH 3 OHN 5 were calculated by Kissinger and Ozawa method under non‐isothermal heating conditions. The compatibility of NH 3 OHN 5 with 1,3,5‐trinitro‐1,3,5‐triazacyclohexane (RDX), 1,3,5,7‐tetranitro‐1,3,5,7‐tetraazacyclooctane (HMX), 2,4,6,8,10,12‐hexanitro‐2,4,6,8,10,12‐hexaza‐isowurtzitane (CL‐20), ammonium perchlorate (AP), and hydroxy‐terminated polybutadiene (HTPB) were tested and judged based on a standard agreement (STANAG‐4147). The DSC results showed that NH 3 OHN 5 /HMX, NH 3 OHN 5 /RDX, NH 3 OHN 5 /CL‐20, NH 3 OHN 5 /AP and NH 3 OHN 5 /HTPB had good compatibility.