Science and Technology of Energetic Materials

Vol.68, No.5 (2007)

Research paper

Combustion characteristics of black powder (I)
- Ignition characteristics - (*in Japanese)
Takuo Kuwahara


Black powder contained potassium nitrate (KNO3), carbon (C), and sulfur (S). This kind of powder is one of the pyrolants, and it is easy to ignite by shock and friction. Usually we add water (H2O) to decrease this high sensitivity. In this study we obtained to affect S and H2O to ignition characteristics of black powder. Ignition delay time divided into two terms, one is physical ignition delay time and second is chemical one. Ignition delay time decreased with increasing S at ratio of C/S = 15/10. Chemical delay time became larger than physical one over S = 12 wt% and reached minimum ignition delay time at S = 15 wt%. At H2O added physical ignition delay time was larger than chemical one, so it is important not to heat black powder partially and not accumulate energy in it.

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Black powder, Ignition, Chemical delay, Physical delay.

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