核壳结构nAl@Cu(BTC)/Fe(BTC)纳米铝热剂的制备及燃烧性能OA北大核心CSTPCD

In order to solve the inhomogeneous component distributions and low combustion efficiency in the preparation pro-cess 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(com-bustion 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 thick-ness 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 decom-position 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).