Study of ignition of high-energy materials with boron and diborides of aluminum and titanium

This paper describes the ignition of high-energy materials (HEMs) on the basis of perchlorate and ammonium nitrate and an active fuel-binder, containing Al powders (base composition), B, AlB$_2$, AlB$_{12}$, and TiB$_2$, upon initiation of the process by a CO$_2$ laser in the heat flux density range 90–200 W/cm$^2$. The delay time of ignition and surface temperature of the reaction layer during the heating-up and ignition of HEMs in air. It is obtained that the complete replacement of the micron-sized aluminum powder by amorphous boron as part of HEMs significantly reduces the delay time of the sample (by 2.2–2.8 times) with the same density of the heat flux, and this occurs due to the high chemical activity and difference between mechanisms of oxidation of boron particles. The use of aluminum diboride in HEMs reduces the ignition delay time by 1.7–2.2 times in comparison with the basic composition. The ignition delay time of a HEM sample with titanium diboride decreases slightly (by 10–25%) relative to the ignition delay of the basic composition.