纳米铝粉点火机理的快速光谱研究

用光触发同步采集技术在多光谱系统上测定纳米铝粉与环氧丙烷快速反应的点火延迟时间和基团光谱强度,得出诱导激波作用下纳米铝粉的点火机理。X射线衍射(XRD)数据表明,等离子体方法生产的纳米铝粉由于活性较高表面有部分氧化,电子能谱(XPS)给出结果表明氧化层厚度～3nm,且其反应生成物的电子能谱显示氧化层厚度随诱导激波强度增加而相应增大。单色仪测定AlO(464.8nm)点火时间表明随诱导激波强度增大,纳米铝粉在环氧丙烷反应系统中的抛撒状态分布更均匀,颗粒受热面增大,受热率明显增大,且激波作用下铝粉表面3nm厚氧化层也极易被熔破,使内核活性铝气化与反应系统中的氧原子及含氧分子反应放热而达到点火状态。

Study on the ignition mechanism of aluminum nanoparticle by fast spectroscopy

The ignition delay times and special spectral intensity of aluminum nanopowders reacting with propylene oxide were investigated by fast spectrum system triggered by synchronous shock light singles, and the ignition mechanism was presented from those data. X-ray diffraction (XRD) spectrum indicated that aluminum nanoparticle produced by plasma method has been oxidized for its high activity, X-ray photoelectron spectroscopy (XPS) of sample revealed that there is 3 nm oxide layer on its surface. XPS of the products showed that the oxide layer thickness will increase with the increasing shock wave strength. AlO (464.8 nm) ignition times investigated by monochromator revealed that aluminum nanoparticle will be equably distributed in propylene oxide vapor for increasing shock wave strength to increase its heating surface and heating rate, and shock wave will easily crack the 3 nm oxide layer on aluminum nanoparticle present chance for core active aluminum to react with oxygen atom and containing-oxygen molecule in the reaction system to ignite.