Abstract
This paper provides an analysis of ignition and extinction conditions of boron particles (with a diameter of up to 200 μm) in a nitrogen-chlorine gas mixture. The analytical description is carried out in a dimensionless form without using the Frank-Kamenetsky distribution. This makes it possible to more correctly describe extinction conditions of particle. An analytical approach is used to analyze critical conditions, which consists in founding dependencies in the form of parametric functions. It is shown that, depending on the parameters of the gas environment (temperature and proportion of chlorine), there are hysteresis areas, areas of ignition and extinction, and areas of the crisis-free chlorination mode of boron particles.
 The obtained dependencies are compared with experimental results. Their satisfactory agreement allows us to confirm the kinetic parameters of the chlorination reaction of boron particles, namely the activation energy E = 60 kJ/mol and the pre-exponential factor k0 = 4 m/s.
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