Science and Technology of Energetic Materials

Vol.68, No.5 (2007)

Research paper

Effect of additional copper(II) oxide on the combustion of 5-amino-1H-tetrazole and lithium perchlorate mixtures (I)
- Examination of the burning mechanism -
Yasuyoshi Miyata, Shingo Date, and Kazuo Hasue


Recently, 5-amino-1H-tetrazole (5-ATZ) has been developed for practical use as a substitute to sodium azide, which has been used conventionally as a fuel component of gas generating mixtures for automobile airbags. In this study, the combustion of the mixture of 5-ATZ / lithium perchlorate LiClO4 and the effect of additional copper(II) oxide CuO have been examined. LiClO4 is an oxidizer with high oxygen content per unit mass. 5-ATZ / LiClO4 mixture has displayed higher linear burning rate and superior gas generating ability than 5-ATZ / strontium nitrate Sr(NO3)2 mixture which has been put to practical use. It was found that the granular diffusion flame model was applicable to the samples tested. In addition, it was shown that within the pressure range of 1 - 5 MPa, the rate-determining step of the linear burning rate was the diffusion process. There was an increase in the linear burning rate when a small amount of CuO was added to 5-ATZ / LiClO4 mixture. This is probably because of the shortening of the diffusion distance, which leads to the flame approaching the burning surface and hence to an increase in the amount of heat feedback.

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5-Amino-1H-tetrazole, Lithium perchlorate, Copper(II) oxide, Granular diffusion flame model, Gas generating mixtures.

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