PREVENTION OF FIRE EXPLOSIONS AND UNSAFE IGNITIONS PYROTECHNIC METALIZED MIXTURES WITH ADDITIVES OF INORGANIC SUBSTANCES

Abstract

A wide class of inorganic substances (LiF, NiF, NaF, BaF₂, SiF₂, SrF₂, AlF₃) has been established, the introduction of which in the form of small additives (up to 10%) in the composition of pyrotechnic mixtures based on oxygen-containing oxidizers and metal fuel powders leads to a decrease in speed and an increase resistance of their combustion process to external influences (elevated heating temperatures, external pressures) only for certain ranges of changes in the amount of additives. At the same time, an increase in the amount of the additive and its dispersion, as well as a decrease in the dispersion of the oxidizer leads to a decrease in the sensitivity of the mixture combustion process to external influences (a decrease in the  index in the combustion law).

The introduction of additives of oxides SiO₂, V₂О₅, Fе₂O₃ to mixtures of NH₄ClO₄ (or F-3) + metal fuel (Mg, Al) leads not only to an increase in the burning rate, but also to a change in the nature of its dependence on external pressure, which significantly reduces the stability of the burning process mixtures to external thermal actions.