As a new gas generant, the thermal behavior of the Ni complex nitrates of carbohydrazide and
aminoguanidine (hereafter, NiCDH and NiAG, respectively) was investigated when mixed with
Sr(NO3)2 of the oxidizing agent.
The thermal stability of NiAG was higher than that of NiCDH based on the results in DTA. In
both complexes, there was a slight differerence in the heat of combustion and the burning temperature
in a tube at the stoichiometric composition with Sr(NO3)2. However, for the burning rate in
a tube, the NiCDH system was two times as fast as the NiAG system. The burning rate for the
NiAG system was almost equal to one for the MgCDH system7) when the CDH was cordinated to
Mg. A non - stoichiometric NiO (Ni2+1-×Ni3+2×O) produced
during the decomposition of the Ni complex was assumed to be the catalyst in the oxidation - reduction reaction during
the combustion.
For the evolved gases, N2 and CO2 account for about 99 percent of all evolved gases in both
complex mixtures. In the NiAG system, the evolution amount of HCN gas was very slight (10-1mol / mol - complex),
and the amount of CO gas was also slight (10-2mol / mol - complex).
新規ガス発生剤として, カルボノヒドラジド, アミノグアニジンのNi錯体硝酸塩(以後, 各々NiCDH, NiAGと略)の熱的挙動が硝酸ストロンチウム混合系にて検討された。
2種類のNi錯体の熱安定性は, 熱分析結果の比較から, NiAGの方が安定である｡ 酸化剤混合系での反応熱(燃焼熱), 燃焼温度は, 両錯体系で大きな差異は認められなかった｡ しかし, NiCDH系で得られた燃焼速度は, NiAG系だけでなく, 同じくカルポノヒドラジドをMgに配位させたMgCDH錯体よりも, 2倍近くの値を示した｡ Ni錯体の分解で生じる非化学量論組成のNiO(Ni2+1-×Ni3+2×O)
が燃焼反応時の酸化還元反応に触媒として作用する可能性が示唆された｡
燃焼反応時の発生ガスは, いずれの錯体系においても, 99%が窒素と二酸化炭素であった｡ NiAG系ではシアン化水素ガスの発生は極微量(10-4mol / mol - complex)で, さらに一酸化炭素ガスの発生も少ない結果が得られた(10-2mol / mol - complex)。