Abstract
The paper examines chemical transformation in the mixture of BN and TiH2 powders, which is compacted in a graphite die into cylinders, in a temperature-gradient system under the impact of solar energy on the edge of the sample. The research shows how starting particles transform in different temperature zones and at different temperature increase rates in reaction volumes. It is established that the temperature increase rate significantly contributes to chemical transformations when a gaseous phase forms. It determines the kinetic parameters and transformation mechanism for the starting compounds and the fraction of gas components that may leave the reaction volume with a gaseous flow because of the smaller duration and probability of their contact with the particles involved in chemical processes.
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