核壳结构 nAl@Cu（BTC）/Fe（BTC）纳米铝热剂的制备及燃烧性能

In order to solve the inhomogeneous component distributions and low combustion efficiency in the preparation process of nano‐thermite，the core‐shell structured nAl@Cu（BTC）/Fe（BTC）was prepared via a layer by layer assembly technique. The structure，morphology，thermal reaction performance（thermite‐reaction temperature）and combustion performance（combustion time，ignition delay time，and combustion temperature，etc.）of nAl@Cu（BTC）/Fe（BTC）were studied. The results show that the thickness and morphology of the coating layer can be regulated during the layer by layer assembly process. As the thickness of the coating layer increases，the nano‐thermite gradually changes from rough and loose to smooth and dense. The nano‐thermite with alternating 12 layers of Cu（BTC）/Fe（BTC）possesses a severe burning effect with a fast flame propagation rate that reaches the maximum flame within 0.710 seconds. Besides，this sample also achieves a moderate ignition delay time （0.509 s），the shortest combustion time（2.036 s），and the highest combustion temperature（1425 ℃）. Meanwhile，its decomposition peak temperature of aluminum oxidation reaction can be reduced to 552.5 ℃ and 735.0 ℃ due to the synergistic effect of Cu（BTC）and Fe（BTC）.