IGNITION OF SIMULATED PROPELLANTS BASED ON AMMONIUM PERCHLORATE
STANFORD RESEARCH INST MENLO PARK CA
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The ignitability of simulated solid propellants based on NH4C1O4 was studied using the radiation from an arc image furnace as a source of ignition energy. The experimental measurements provide for given conditions the minimum time of exposure to radiation required for ignition and combustion of pellets pressed from powdered mixtures of NH4C1O4 and copper chromite NH4C1O4, carbon, and copper chromite and NH4C1O4, copper chromite, and polyethylene. Minimum exposure times were determined as a function of pellet composition, flux 20 to 120 calsq cm sec, pressure 1 to 40 atm, and composition of the atmosphere N2, He, A in contact with the pellet. The experimental results in conjunction with supplementary kinetic information indicate that, for these materials, gas phase ignition need not be preceded by a catastrophic rate of heat release within the sample. The critical chemical species involved during gas phase ignition is probably perchloric acid. Under some circumstances, a high rate of solid reaction does appear to be involved during ignition of the materials.
- Inorganic Chemistry