Boron-nitrogen system, combustion

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... 

Figure 2.9 schematically represents mechanism of BN a formation in the combustion wave. For the boron-nitrogen system, the liquid-phase edge in which boron and nitrogen dissolve acts as a chemical pump. Apparently, in case of... 

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