Study on the deflagration reaction kinetics and thermal decomposition of hexanitrohexaazaisowurtzitane

An experimental equipment of measuring the deflagration delay time (τ) of energetic materials was built up. The values of τ of hexanitrohexaazaisowurtzitane (HNIW) were studied at the temperature of 507-547 K and pressure of 0. 1-9. 1 MPa. When temperature is increased, the deflagration delay time is decreased. The results show that at 507 K and 517 K, the high pressure (≥ 5 MPa) makes τ increase, and at 527 K and 537 K, the pressure does τ shorten. Deflagration reaction kinetic parameters at different pressures were calculated. The activation energy of deflagration reaction of HNIW increases with pressure. The thermal decomposition of HNIW at different temperatures (≤ 489 K) and pressures were investigated. The results show that pressure retards the thermal decomposition of HNIW.