Abstract

Effect of K₂CO₃ and KCl additives on the process of high-temperature oxidation and ignition of conglomerates of powdered boron and aluminum particles and on the critical conditions for the ignition of particle–gas mixtures of these metals is studied experimentally. It is revealed that the mixtures of boron and aluminum particles covered (encapsulated) with salts ignite at temperatures lower than the ignition temperatures of mechanical mixtures of metals with these salts in appropriate proportions and significantly lower ignition temperatures of pure boron and aluminum. This indicates the active role of salts in the process of heterogeneous ignition. It is established that, for boron conglomerates, the accelerating effect of salt additives on the oxidation of conglomerates is noticeable at all investigated concentrations and compositions starting from 1% (by weight). For aluminum, an increase in the reaction rate is noticeable only for KCl additives at concentrations of 3% and above.

中文翻译：

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铝和硼点火的增强

摘要

K ₂ CO _3的作用和KCl添加剂对粉末状硼和铝颗粒的高温氧化和着火过程以及这些金属的颗粒-气体混合物着火的临界条件进行了研究。揭示了用盐覆盖（包封）的硼和铝颗粒的混合物在低于适当比例的金属与这些盐的机械混合物的机械着火温度下点燃，并且显着降低了纯硼和铝的着火温度。这表明盐在异质着火过程中的积极作用。可以确定的是，对于硼集团而言，盐添加剂对团块氧化的促进作用在所有研究的浓度和组成（从1％（重量）开始）上都是明显的。对于铝，仅对于浓度大于或等于3％的KCl添加剂，反应速度才明显提高。