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.
5-amino-1H-tetrazole（5-ATZ） は，自動車用エアバッグに使用されているアジ化ナトリウムに代わる燃料成分として注目されている。酸化剤として用いた過塩素酸リチウムは，酸素含量が多い。本研究では，5-ATZと過塩素酸リチウム混合物の燃焼及び酸化銅（II）添加の影響について調べた。5-ATZと過塩素酸リチウム混合物の線燃焼速度は，実用化されている5-ATZ／硝酸ストロンチウム混合物より速く，単位質量当たりのガス発生量が多いことがわかった。また，拡散粒状火炎モデルが適用できるかどうか検討し，1-5MPaの試験範囲で，拡散過程が線燃焼速度に影響することを見いだした。酸化銅（II）を少量添加すると線燃焼速度が増加するのは，拡散距離を短くなり，火炎が燃焼表面に接近し，フィードバック熱量が増すためと思われる。
5-Amino-1H-tetrazole, Lithium perchlorate, Copper(II) oxide, Granular diffusion flame model, Gas generating mixtures.