HOME

Science and Technology of Energetic Materials

Vol.64, No.1 (2003)

Research paper

Thermal behavior of the mixtures of aromatic compounds with potassium perchlorate (Study on pyrotechnic whistling noise)(*in Japanese)
Michio Koga, Koki Ishikawa, Masami Sonoda, Li Jing, Toshiaki Tsuru, and Shun-ichi Yoshinaga
p.1-8

Abstract

The mixtures of potassium salt of aromatic compounds such as benzoic acid, terephthalic acid and salicylic acid and potassium perchlorate were widely used as a pyrotechnic whistle composition.
 In this report, the pyrotechnic whistle compositions of the mixtures of aromatic compounds with potassium perchlorate were investigated by thermal analysis, calculation the gas evolution rate by measurement of linear burning rate and sound tests such as the waveform, frequency and sound pressure analysis of the whistling noise for contained whistling noise compositions. The results obtained are as follows:
1) Compositions capable for producing whistling noise are the mixtures of potassium salt of aromatic compounds such as potassium biphthalate and potassium benzoate with potassium perchlorate which proportions are in the stoichiometric composition.
2) It is suggested that, terephthalic acid which sublime before the reaction with potassium perchlorate is unusable for whistle composition due to the cause of decreasing the linear burning rate and the gas evolution rate.
3) The harmonic frequency of the whistling noise was integral multiple of the fundamental frequency as opposed to anisoploid of the fundamental frequency. Therefore, whistling noise was considered to appear by the resonance of the open tube and the tone of the whistling noise can be synthesized from the fundamental frequency and the harmonic frequency.

> Full text (Open access*)

© Copyright 1999-2017 Japan Explosives Society. All right reserved.