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纳米Al粉有独特热行为,能增强某些含能材料的性能。然而,纳米Al粉与水的反应性高,导致纳米Al粉“老化”,降低了它在含能复合材料中的作用。由于纳米Al粉的老化反应与吸附至其表面的水有关,因此应特别关注水的吸、脱附作用。本文用TG和TG-FTIR-MS研究了纳米Al粉吸附气体的热脱附。结果表明,所研究的纳米Al粉含12%(质量)的吸附气体。用FTIR和MS检测到水和CO2的脱附。用多重加热速率和等温研究,得到了吸附气体的脱附过程动力学参数。对不同方法得到的脱附活化能进行了比较。
Nanometer Al powder has a unique thermal behavior, can enhance the performance of certain energetic materials. However, the high reactivity of nano-Al powders with water leads to “aging” of the nano-Al powder and reduces its role in the energy-containing composite materials. Since the aging reaction of nano-Al powder is related to the water adsorbed to the surface, special attention should be paid to the adsorption and desorption of water. In this paper, TG and TG-FTIR-MS were used to study the thermal desorption of nano-Al powder adsorbed gas. The results show that the nano-Al powder containing 12% (mass) of adsorbed gas. Desorption of water and CO2 was detected with FTIR and MS. Using multiple heating rates and isothermal studies, kinetic parameters of desorption process for adsorbed gas were obtained. The activation energy of desorption obtained by different methods were compared.