Preparation of Al-MoO₃ composites and its thermal properties

The micron-sized Al-MoO₃ composites were prepared by a high-energy milling method under the protection of argon gas. The morphology and structure of micron-sized Al-MoO₃ were analyzed by scanning electron microscopy (SEM), laser particle size analyzer and X-ray diffraction (XRD). The thermal property of the Al-MoO₃ composites was analyzed by thermogravimetry-differential scanning calorimetry (TG-DSC). The results show that the Al-MoO₃ composites prepared by high-energy milling method are in the form of plate with uniform particle size distribution and the grain size reduces. Compared with original Al powder, the thermal performance of the oxidation reaction of Al-MoO₃ composites and air is significantly improved. The mass gain rate and the reaction rate of aluminum increase by 48.4% and 60.8%, respectively. A larger exothermic peak occurs at the temperature of 1070℃. The maximum heat flow and exothermic reaction enthalpy increase by 160.9J/g and 4106.2J/g, respectively. The activation energy decreases to 297.8kJ/mol. The oxidation performance of Al-MoO₃ composites and air is greatly improved.