As a sequel to the previous study, the burning characteristics of azodicarbonamide (ADCA)/ammonium nitrate (AN) based mixtures were studied, where either MnO2, Cu or basic copper nitrate (BCN) was selected as an additive in this study. From chemical equilibrium calculations, linear burning rate tests, and rate-of-pressure-rise tests, the following conclusions were obtained : (1)the calculated values of adiabatic flame temperature and heat of explosion of all ADCA/AN based mixtures were higher than those of guanidinium nitrate (GN)/strontium nitrate (SrN) /basic copper nitrate (BCN) mixture ; (2)ADCA/AN /MnO2 mixture did not burn readily at or below 0.5 MPa N2 atmosphere, showing relatively poor ignitability ; (3)the addition of Cu accelerated the linear burning rate and also generally decreased the pressure exponent of Vieille’s equation as compared to ADCA/AN mixture, while it also accelerated the rate-of-pressurerise, exceeding that of GN/SrN/BCN mixture that used commercially, while in the case in which BCN was added, its rateof-pressure-rise showed a close value.
本研究では,前回の続編として,アゾジカルボンアミド(ADCA)/硝酸アンモニウム(AN)混合物に,燃焼特性を高めるために,二酸化マンガン(MnO2),銅(Cu),又は塩基性硝酸銅(BCN)を加えて,添加物の影響について検討した。 化学平衡計算,線燃焼速度試験及び圧力上昇速度試験を行い,実験結果から(1)〜(3)の結論が得られた。 (1)化学平衡計算から,いずれのADCA/AN系混合物もGN/SrN/BCN混合物よりも断熱火炎温度が高くなり,爆発熱についても同様の結果が得られた。 (2)ADCA/AN/MnO2混合物は,0.5 MPa以下のN2雰囲気下で着火ができず,比較的低い着火性であった。 (3)Cuを添加することにより,線燃焼速度は増加し,圧力指数は減少し,また,圧力上昇速度も高くなり,実用化されている硝酸グアニジン(GN)/硝酸ストロンチウム(SrN)/塩基性硝酸銅(BCN)混合物よりも圧力上昇速度が高くなった一方,BCN添加の場合は近い値を示した。
azodicarbonamide, ammonium nitrate, chemical equilibrium calculation, linear burning rate, rate-of-pressurerise