Combustion of ammonium and hydrazine azides

✍ Scribed by A.E. Fogelzang; V.Yu. Egorshev; V.P. Sinditsky; B.I. Kolesov

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 400 KB
• Volume: 90
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(92)90090-c

✦ Synopsis

Steady-state combustion of ammonium azide (AA) and hydrazine azide (HA) was studied in a window constant-pressure bomb over a pressure range of 0.1-36 MPa. HA burns three to four times faster than AA over the whole pressure range. The temperature distribution in the combustion wave of AA and HA was measured using 5-/xm-thick H-shaped tungsten-rhenium tape thermocouples. The combustion temperature of both compounds is 240-430 K higher than the temperature calculated for the thermodynamically equilibrium composition of the combustion products due to the presence of large amounts of ammonia (0.97 and 0.87 tool per AA and HA mole, respectively). The burning surface is formed via dissociation of the salts into hydrazoic acid HN 3 and the parent base. The growth of the surface temperature with pressure is determined by the dissociation enthalpy of the salts. The burning rate of these compounds is determined by heat release in the gas phase. Based on the data obtained on combustion of AA and HA, the kinetic parameters of the HN 3 decomposition reaction occurring in the gas phase were calculated (k = 101626 exp (-19350/T) cm 3 mol 1 s-1). An estimate of the burning rate of liquid HN 3 at 0.1 MPa (u = 1.9 g cm-2 s-i ) is given.