Effects of CuO, Cu, and MnO_2 on Combustion of Ammonium Nitrate / Aminoguanidinium 5,5'-azobis-lH-tetrazolate Mixtures

摘要

In this research, mixtures of ammonium nitrate (AN) and aminoguanidinium 5,5'-azobis-lH-tetrazolate (AGAT) which is a self combustible tetrazole were studied. In addition, CuO and MnO_2 which have been known as the decomposition catalysts of AN together with Cu were added to AN/AGAT mixtures, and the effects on combustion characteristics were examined. In addition, the energy used for flame propagation Δ E_p and mass burning rate m were compared. The addition of CuO and Cu lowered ignition temperature T_(ig), lowered activation energy E_a, and increased m because CuO and Cu promoted the exothermic reaction of AGAT and AN in the condensed phase at about 400 K - 440 K. In addition, it was suggested that CuO and Cu functioned as decomposition catalysts of AN, and the same decomposition and reaction happened because the SC-DSC data by using stainless steel cell were similar. The addition of MnO_2 raised E_a because MnO_2 promoted the endothermic reaction of AN and the heat of reaction was increased in the condensed phase at about 440 - 530 K. However, m did not increase so it is suggested that E_a and the heat of reaction counterbalanced each other. There was a correlation between Δ E_p and m while there was no correlation between the propagation index of McLain P_i and m. Δ E_p is effective as a comparative screening criterion for m in this study.