Al-MoO_3复合物的制备及热性能

Preparation of Al-MoO_3 Composites and Its Thermal Properties

采用氩气保护下的高能球磨法制备了微米级Al-MoO3复合物,通过扫描电镜(SEM)、激光粒度测试仪、X射线衍射(XRD)表征了Al-MoO3复合物的结构及形貌,用热重-差示扫描量热法(TG-DSC)研究了其热性能。结果表明,高能球磨法制备的Al-MoO3复合物呈片状,粒径分布均匀,晶粒粒径降低;与未球磨的Al粉相比,Al-MoO3复合物与空气氧化反应的热性能显著提高,Al的增重率和反应率分别提高了48.4%和60.8%;1 070℃左右出现一个较大的放热峰,最大热流率和放热反应焓分别增加160.9J/g和4 106.2J/g,活化能仅为297.8kJ/mol。该复合物与空气反应性能得到改善。

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 of1 070℃.The maximum heat flow and exothermic reaction enthalpy increase by 160.9J/g and 4 106.2J/g,respectively.The activation energy decreases to 297.8kJ/mol.The oxidation performance of Al-MoO3 composites and air is greatly improved.