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含能材料  2006 

粒径大小对高频感应加热制备纳米铝粉活性影响

Keywords: 材料科学,纳米铝粉,粒子尺寸,活性,热学行为,储能

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Abstract:

采用高频感应加热蒸发-冷凝法制备了20,25,50nm三种不同粒度的纳米铝粉,并运用X射线衍射(XRD)和透射电镜(TEM)对纳米铝粉进行表征,使用差热分析(DTA)研究了不同粒径纳米铝粉的热学行为。结果发现,随着纳米粒子粒径从50nm减小到20nm,纳米铝粉反应放热热焓从3.721kJ·g-1减少到0.928kJ·g-1,即随着粒径的减小纳米铝粉的活性反而变低。认为这是由于铝纳米粒子表面氧化铝膜含量的增加,采用高频感应加热方法制备的粒子不存在内部储能所致。因此,纳米铝粉的活性,不仅取决于粒子的尺寸大小,还取决于粒子的制备方法,以及粒子表面包覆壳层的种类、结构、厚度等。

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