Combustion-front microstructure in heterogeneous gasless media (using as an example the 5Ti + 3Si system)

A new experimental method for studying the propagation of a gasless combustion wave using high-speed microvideo recording, computer recording, and processing of video records allowed conditions of existence of a microheterogeneous combustion regime to be determined. A combustion wave propagates chaotically by jumps through samples with porosity of 45–50% and higher. During the delay between the jumps, the next sample layer (or unit cell) is heated. The heating-zone size is close to the sample particle size ($\sim$100 $\mu$m). For denser samples, this process is described by the classical equations of propagation of a homogeneous combustion wave. In this case, the sizes of the heating and reaction zones are much larger than the particle size.