Science and Technology of Energetic Materials

Vol.62, No.4 (2001)

Research paper

Combustion characteristics of 5-amino-1H-tetrazole and strontium nitrate mixtures(*in Japanese)
Kazuo Hasue, Paisarn Boonyarat, Yasuyoshi Miyata, and Jyouichi Takagi


This paper describes the study concerning fundamental combustion features of the mixtures of 5 - amino - 1H - tetrazole(HAT) and strontium nitrate,Sr(NO3)2. Tetrazoles have been studied as a replacement for sodium azide and HAT, a typical tetrazole,was chosen in this study because it is readily available. The HAT / strontium nitrate mixtures were consolidated to form test strands. A chimney type strand burner with optical windows was used to measure the burning rate of the strands and also tempemture profile in the vicinity of burning surface was obtained. The maximum burning rate for HAT / strontium nitrate mixture at 1MPa was about 7 mm / s when the HAT concentration was 36.5 wt% which is a stoichiometric ratio. The gaseous products of the combustion were analyzed by s gas chromatography and the main products were N2, CO2, O2, and CO. The heat of explosion orf HAT / Sr(NO3)2 reached a maximum when the HAT concentration was approximately 38 wt%. The time - pressure relationship was observed while the heat of explosion was measured in a calorimeter. The most vigorous reaction was observed at HAT concentration of 36.5 wt%. The equilibrium thermodynamic calculations of the tested mixtures were carried out, modeling the situation in the calorimeter bomb. Using this program, assuming constant volume, adiabatic flame temperature, heat of explosion, and combustion products were estimated. The main combustion products at 298 K and adiabatic flame temperature were obtained. The pyrolysis was carried out from 473 K to 1073 K and the combustion products were identified by the mass spectrometer.

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