纳米铁粉/碳纳米管的光点燃特性

Flash Ignition Characteristics of Iron Nanoparticles and Carbon Nanotubes

为了研究碳纳米管与纳米铁粉复合材料的光点火燃烧特性,首先用普通物理混合的方式在纳米铁粉中添加不同质量含量的碳纳米管制备了复合材料,利用普通闪光灯对材料进行曝光,然后利用高速摄像机研究闪光点火瞬间的燃烧现象,发现材料被点燃发出明亮的红光并产生白烟.通过分析燃烧过程中火焰传播的方式,发现材料的着火点出现在样品边缘,火焰由外向内进行扩散.利用双色法测量了纳米铁粉及其复合材料燃烧时温度场的分布,发现添加碳纳米管能够提高平均燃烧温度,改变碳纳米管的含量对温度场的影响不大.最后利用微观检测手段分析燃烧后的产物,发现纳米铁粉熔融成片状的三氧化二铁.

In this study,we investigated the flash ignition characteristics of iron nanoparticles (NPs) and carbon nanotubes (CNTs).First,we manually mixed different contents of CNTs with iron NPs and then exposed the mixtures to a common flash and recorded the combustion phenomenon by high-speed camera.We found the mixture to be ignited with a bright red light and white smoke,and observed that the ignition point first occurred at the edge of the sample and the flame then propagated to the inner part.We determined the temperature distribution of mixtures with different contents of CNTs using the two-color method and found that the addition of CNTs can promote the combustion of iron NPs.There was no difference in temperature distribution by changing the CNT contents.Finally,we determined the oxidation products to be Fe2O3 sheets by using micro-measurement.