Abstract

It was experimentally shown for the first time that compact samples of pyrophoric nickel nanopowders can be passivated in air for 3–5 s. The passivation of the samples was confirmed by the absence of noticeable heat release during slow heating to 200°C, an insignificant oxygen content according to the data of X-ray powder diffraction analysis and scanning electron microscopy, and the retention of the chemical activity of the samples. The uniform distribution of oxygen throughout the sample suggests the volumetric nature of their interaction with air during the passivation. The critical conditions for heating of passivated samples under which ignition occurs were determined.

中文翻译：

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紧凑的镍纳米粉样品的钝化及其与空气相互作用的方式

摘要

首次通过实验证明，发火镍纳米粉末的紧凑样品可以在空气中钝化3到5 s。根据X射线粉末衍射分析和扫描电子显微镜的数据，在缓慢加热至200°C的过程中没有明显的放热，氧含量微不足道，并且样品的化学活性得以保留，从而证实了样品的钝化。样本。整个样品中氧气的均匀分布表明钝化过程中它们与空气相互作用的体积性质。确定了加热钝化样品的临界条件，在该条件下会发生着火。