CAJ | 학술논문

为确定2Al/Fe_2O_3铝热剂的点火温度,对铝粉重量、电阻和形貌随温度变化的特性进行了实验观测,用均匀体系热爆炸理论计算了铝热剂球的临界点火温度并通过实验检验.结果表明,对于粒径约30 μm的铝热剂,温度超过铝的熔点(933 K)时铝粉氧化膜胀裂,流出的铝液铺展到邻近的氧化铁粉表面; 点火温度约1600 K,低于氧化铁分解点(1730 K),点火前化学反应为液-固相型; 点火温度与铝热剂球的体积无明显关系,均匀体系热爆炸理论不适用.
위학정2Al/Fe_2O_3려열제적점화온도,대려분중량、전조화형모수온도변화적특성진행료실험관측,용균균체계열폭작이론계산료려열제구적림계점화온도병통과실험검험.결과표명,대우립경약30 μm적려열제,온도초과려적용점(933 K)시려분양화막창렬,류출적려액포전도린근적양화철분표면; 점화온도약1600 K,저우양화철분해점(1730 K),점화전화학반응위액-고상형; 점화온도여려열제구적체적무명현관계,균균체계열폭작이론불괄용.
Ignition temperature of 2Al/Fe_2O_3 thermite was studied by analysis and experiments. Failure temperature of aluminum particle oxide film was analyzed according to the weight,resistance and appearance of aluminum powder undergoing different temperatures. Critical ignition temperatures of thermite spheres with different radii were calculated by Frank-Kamenetskii theory and measured by a high-temperature muffle furnace. Results show that the protective film fails almost completely at the melting point of aluminum,and ignition occurs at temperature of about 1600 K, and the independent of the volume of thermite sphere and ignition temperature is not correctly calculated by the Frank-Kamenetskii theory of homogeneous combustible system.