СКОРОСТЬ ГОРЕНИЯ ВЫСОКОЭНЕРЕЕТИЧЕСКИХ МАТЕРИАЛОВ, СОДЕРЖАЩИХ МЕТАЛЛИЧЕСКОЕ ГОРЮЧЕЕ НА ОСНОВЕ AL И B

An effective method of increasing the energy characteristics of high-energy materials (HEMs) is the use of boron and metal borides powders which have high values of specific energy released during oxidation and its combustion. This study investigates the powders of amorphous boron and aluminum borides which are used to the composition of solid propellant based on ammonium perchlorate, ammonium nitrate, and an active fuel-binder. Aluminum borides powders were obtained at RI AMM TSU (Tomsk) using the self-propagating high temperature synthesis (SHS) method. We carried out a~series of combustion measurements for the metallized HEM compositions in the range of nitrogen pressure of 0.5—7.0~MPa. The burning rate and power exponent were determined for the test HEM compositions in a constant pressure bomb. It was established that the complete replacement of pure aluminum by amorphous boron powder in HEM increases the burning rate of the HEM sample by 1.9—3.2 times depending on pressure. In this case, the exponent in the combustion law increases from~0.58 to~0.84. The burning rate of the HEM samples containing aluminum borides AlB2 and AlB12 increases by 1.2—1.6 times but the exponent remains constant.