Ti纳米颗粒对Al/CuO基叠层薄膜燃烧行为的影响

Effects of Ti Nanoparticles on Combustion Behavior for Al/CuO-based Multilayered Films

为降低亚稳态分子间复合物的点火能量,利用抽滤的方式制备了一系列不同Ti掺杂浓度(10%~30%)的Al-Ti/CuO叠层薄膜。采用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)、激光点火和差示扫描量热仪(DSC)对其形貌、化学成分及燃烧行为进行了测试,并分析Ti纳米颗粒在Al/CuO叠层薄膜中的作用机制。结果表明:Ti纳米颗粒的添加降低了Al/CuO叠层薄膜的点火阈值,其中20%Ti添加量的叠层薄膜点火阈值仅为21.2 mJ,相比Al/CuO降低了约36%。但过量添加Ti纳米颗粒会导致大量微米级球状烧结结构的生成,该结构会包裹未反应的纳米铝颗粒,阻碍其能量的释放和后期火焰的传播。

In order to reduce the ignition energy of metastable intermolecular complex, a series of Al-Ti/CuO multilayered films with different mass ratio(10%~30%) of Ti nanoparticles were prepared by suction filtration. By use of scanning electron microscope(SEM), X-ray diffraction(XRD), laser ignition and differential scanning calorimetry(DSC), the corresponding morphology, chemical structure and combustion behavior were tested, and the effects of Ti nanoparticles in Al/CuO multilayered films was further analyzed. These results show that the addition of Ti nanoparticles reduce the ignition threshold of Al/CuO multilayered films, the ignition threshold of thermite multilayered film with 20% Ti addition is only 21.2 mJ, which is about 36% lower than that of Al/CuO. However, a large number of micron spherical sintering structures are formed during the combustion process with the excessive addition of Ti nanoparticles. These sintered structures cover onto the fuel, which deteriorate the energy release and cause the combustion process decline obviously.