Structure Formation in CS wave

Methods of Investigation of Structural Transformation in Combustion Wave 

Depending on the characteristic time of the investigated process of structure 

For the boron-nitrogen system, because the high gas pressure is required for the synthesis, it is difficult to apply any dynamic method for investigation of the microstructural transformations, which occur in the combustion front. Thus, the static quenching technique was used [26, 23, 27]. The idea of this method is to extinguish the combustion wave and quickly cool the sample it is necessary to freeze all zones with the characteristic microstructure, chemical and phase structure of the reactants, intermediates, and final products. For quenching to take place, the heat loss from the reaction front at some point must exceed the critical 

The second type of quenching method is based on the gradual increase of the heat loss with movement of the combustion front through the sample. The prototype of these methods was considered for experiments by Belyaev and coworkers [29] to determine the critical diameter of combustion of condensed matter. During movement of the combustion front from the base of the cone to its top, the specific heat loss increased, reaching the critical value in some cross-section of the cone where the extinction occurred. The most widely used method is the quenching of combustion waves in a wedge-shaped cutout of a massive copper block [27]. 

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