摘要
为确定2Al/Fe2O3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30μm的铝热剂,温度超过铝的熔点(933K)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1600K,低于氧化铁分解点(1730K),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。
Ignition temperature of 2Al/Fe2O3 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.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2010年第2期162-166,共5页
Chinese Journal of Energetic Materials
关键词
应用化学
铝粉
氧化铁粉
铝热剂
氧化膜失效
点火温度
applied chemistry
aluminum powder
ferric oxide powder
thermite failure of oxide film
ignition temperature
