Science and Technology of Energetic Materials

Vol.67, No.4 (2006)

Research paper

Burning characteristics of AN/AP-based composite propellants prepared with fine and coarse AP particles (*in Japanese)
Saeko Yoshida and Makoto Kohga


Ammonium nitrate (AN)-based composite propellant has been attracted, primarily because of the clean burning nature of AN, oxidizer. However, this propellant has some disadvantages such as poor ignition and low burning rate. Ammonium perchlorate (AP)-based composite propellant has excellent ignition and burning characteristics, although the combustion gases include HCl. It is expected that AN/AP-based propellant would have an acceptable performance for practical applications because the disadvantages of the AN-based propellant would be compensated for the advantages of the AP-based propellant. The burning rate of the AP-based propellant depends on the AP particle size. The burning characteristics of the AN/AP-based propellant would be influenced by the AP particle size. In this study, burning characteristics of the AN/AP-based propellants with fine AP and coarse AP; 3 μm and 180 μm, were investigated. The thermal decomposition behaviors of the AN/AP propellants were independent of the AP particle size. The burning rate characteristics of AN/AP propellants were remarkably effected by the particle size and the content of AP. Some of the AN/AP propellants prepared with fine AP self-quenched or burned improperly: partial flashing flame and flame propagation along the side of the propellant. Furthermore, the cause of these unstable combustions was revealed.


Ammonium nitrate, Ammonium perchlorate, Composite propellant, Combustion

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