The thermal modes of passivation of pyrophoric nanopowders at a reduced initial temperature of a nanopowder bed were studied by analytical and numerical methods using a macrokinetic approach. It was shown that a decrease in the initial temperature of a nanopowder leads to a transition from the layer-by-layer passivation mode to the bulk passivation mode, which makes it possible to control the acceptable warmup level in passivation even if the oxidizer concentration in the gas is high. Analytical expressions for determining the boundaries of the layer-by-layer and bulk passivation modes were derived and confirmed by numerical calculations.

中文翻译：

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初始温度对自燃粉末钝化模式的影响：宏观动力学方法

使用宏观动力学方法通过分析和数值方法研究了在纳米粉末床的初始温度降低时自燃纳米粉末钝化的热模式。结果表明，纳米粉末初始温度的降低导致从逐层钝化模式转变为体钝化模式，这使得即使氧化剂浓度为气很高。用于确定逐层钝化模式和体钝化模式边界的解析表达式被推导出并通过数值计算得到证实。