The thermal analyses, the analyses of combustion residue, and the combustion chracteristics
measurements such as burnig rate or combustion temperature were carried out to clarify
the thermal and combustion reaction mechanisms of the manganese - lead chromate - barium
chromate delay oomposition. The following results were obtained.
The main reaction of the manganese - lead chromate - barium chromate delay composition was
the oxidation of manganese by lead chromate. Barium chromate acted as a burning rate modifer,
i.e. the larger its content, the less its burning rate. The thermal analyses of manganese - lead
chromate binary mixture and manganese - lead chromate - barium chromate ternary mixture
showed a broad exothermic peak over 200 to 750 ℃ in atmspheric condition, but under reduced
pressure, it showed an intense exothermic reaction. The heat of combustion of the delay composition
had a maximum value at the composition of manganese / lead chromate = 30 / 70 by weight
without barium chromate, but the compositions which contained a larger percentage of manganese
than this showed a larger linear burming rate. The pressure index of combustion is small,
indicating that a solid state reaction played an important role in the combustion.
熱分析, 燃焼残留物の分析, 燃焼速度や燃焼熱などの燃焼特性の測定により, マンガン - クロム酸鉛 - クロム酸バリウム系延時薬の反応性を検討し, 次の結果を得た｡
この延時薬系の主反応は, クロム酸鉛によるマンガンの酸化であり, クロム酸バリウムは燃焼を抑制する｡
大気中でのこの三成分延時薬の熱分析では, 200 - 750 ℃で幅広い発熱反応を示すが, 減圧中では激しい反応を引き起こす｡ 延時薬の燃焼熱は, マンガン / クロム酸鉛 = 30 / 70で最大値を持つが, 燃焼速度はこれよりマンガン過剰の領域で最大値をとった｡ 圧力指数が小さいことから, この系の燃焼には固相反応の寄与が大きいと考えられる。