REGULARITIES OF THE COMBUSTION PROCESS OF METAL FUEL PARTICLES IN THE DECOMPOSITION PRODUCTS OF PYROTECHNIC MULTICOMPONENT NITRATE-ZIRCONIUM MIXTURES

Abstract

In modern conditions, methods of preventing the occurrence of forced fire-hazardous destruction of products in the event of exposure to external thermal actions are of great practical importance. To develop such methods, it is necessary to have the results of studies of the processes of development of the combustion of mixture charges under the specified conditions. The basis of these results should be studies of the combustion processes of zirconium particles in the products of thermal decomposition of nitrate-containing oxidants and the additives in question. The purpose of the work is to analyze and establish the regularities of the process of combustion of zirconium particles in active gaseous products of thermal decomposition of nitrate-containing oxidizers and additives of the considered substances to determine the fire-hazardous properties of pyrotechnic mixtures under conditions of external thermal effects.

All studies were carried out with zirconium powders produced by the pyrotechnic industry, on standard pyrotechnic equipment and using modern methods of physical and chemical analysis, methods of cinematography and microcinema, contact and non-contact methods of temperature measurement, methods of X-ray structural and micro-X-ray structural analysis, etc. When studying the ignition and burning of individual zirconium particles in a stream of heated air, it was established that the ignition of the particles occurred at 623 K, and the combustion ended with their splitting. The burning rate of calcithermic zirconium particles was higher than that of sodiumthermic zirconium. The results of studies of the process of combustion of zirconium particles in gaseous products of thermal decomposition of nitrate-containing oxidizers (nitrates of alkali and alkaline earth metals), additives of organic and inorganic substances that are part of pyrotechnic multicomponent nitrate-zirconium mixtures, which precede the premature explosive ignition of mixture charges and fire-hazardous destruction of products are presented. during their circulation (storage, transportation and use), taking into account the influence of external thermal actions (heating as a result of fires, shock thermodynamics in the conditions of a shot and flight, etc.).