微纳结构铝热剂薄膜的旋涂制备及其燃烧性能

为了解决微机电火工品内药剂的快速密实装填的问题，采用旋涂技术制备出厚度可控的微纳结构铝热剂薄膜。利用扫描电镜结果对比得出氟橡胶最小使用量为7%；使用热流法检测了铝热剂薄膜的热物理性能并用高速摄像机记录了薄膜的燃烧过程，得到Al/MoO₃/氟橡胶薄膜的导热系数为75 W/（m·K），燃烧速率为30.6 m/s，在添加还原氧化石墨烯后， Al/MoO₃/氟橡胶/还原氧化石墨烯薄膜的导热系数增至126 W/（m·K）, 燃烧速率高达867.9 m/s. 采用金属桥带进行发火试验，结果证实微纳结构铝热剂薄膜的临界发火电流低于Zr/KClO₄点火药。添加还原氧化石墨烯能改善铝热剂的燃烧性能和发火性能，更利于铝热剂作为点火药应用。

Spin-coating Preparation of Micro-and Nano-thermite Films and Their Combustion Performances

The micro-and nano-thermite films are prepared using spin-coating with fluorine rubber as a binder.Ensuring the integrity of films,the mass content of fluorine rubber is minimized by controlling the spin-coating process.The minimum mass content of fluorine rubber is observed to be 7％ through scanning electron microscope.The thermophysical properties of thermite films are tested using heat flux method.The measured thermal conductivity of Al/MoO3/FE film is 75 W/(m· K),and the burning rate is 30.6 m/s.Surprisingly,the thermal conductivity reaches to 126 W/(m· K),and the burning rate is increased to 867.9 m/s after appending reduced graphene oxide.The ignition test results of metal bridge show that micro-and nano-thermite films could improve the combustion performance of thermite and the ignition performance.