Different Particle Size Of Nanometer Aluminum Powder Thermit Performance Contrast Research

To make the thermite reactions can be more valuable, one of the most effective methods to improve the reaction rate is to make one or two components of the reactant reach nano-scale. According to the thermite reaction characteristics, three kinds of superthermit were prepared in this paper, thermal analysis, ignition temperature and burning rate was compared. Ultrasonic dispersion process was first used to prepare five groups of WO3/Al nanocomposite agents, and then the sol-gel method was used to prepare Cr2O3/Al, Fe2O3/Al nanocomposite agents(Among them, the average particle size of nano-Al powder were40nm,50nm,70nm,100nm and200nm). The products were characterized by SEM, XRD and EDS. The results showed that the dispersion of WO3/Al was very well, nano-Al powder and Cr2O3particle combined closely and the aluminum surface was packed up by the oxidizer nano-Fe2O3. Through the DSC test results it was found that the composite agents that were prepared by the size of Al between the70nm and100nm, their first exothermic peak appeared much earlier than others. Through the ignition experiment it was found that the ignition temperature of composite agents that were prepared by the size of Al between the70nm and100nm was lower than others. Finally, the burning rate test was completed. The reulte also showed that composite agents that were prepared by the size of Al between the70nm and100nm have a higher burning rate than others. This shows that in this size range of compound agents has more excellent property.