Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

Abstract

Abstract. Boron and its compounds are among the most promising metal fuel components to be used in solid propellants for solid fuel rocket engine and ramjet engine. Papers studying boron oxidation mostly focus on two areas: oxidation of single particles and powders of boron, as well as boroncontaining composite solid propellants. This paper presents the results of an experimental study of the ignition and combustion of the high-energy material samples based on ammonium perchlorate, ammonium nitrate, and an energetic combustible binder. Powders of aluminum, amorphous boron and aluminum diboride, obtained by the SHS method, were used as the metallic fuels. It was found that the use of aluminum diboride in the solid propellant composition makes it possible to reduce the ignition delay time by 1.7-2.2 times and significantly increase the burning rate of the sample (by 4.8 times) as compared to the solid propellant containing aluminum powder. The use of amorphous boron in the solid propellant composition leads to a decrease in the ignition delay time of the sample by a factor of 2.2-2.8 due to high chemical activity and a difference in the oxidation mechanism of boron particles. The burning rate of this sample does not increase significantly.

Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements

“…Tese results on average correlate to relative burn time data in which Zr had shorter burn times than Ti for particles of roughly the same size [47] and results in which Al had longer burn times than Ti powders [63]. In tests of small amounts of high explosive materials doped with Al and B, B exhibited the slower burn rate [64]. Since these data correlate with relative burn times found in other publications, it may be reasonable to conclude that U burn times are on average longer than that of Zr, Ti, and Al, and shorter than that of other species tested for particles of the same size.…”

Promising Rocket Fuel Components. Ii. Fuel Additives (Review)

“…Алюминий, образующий высокотемпературные продукты сгорания, способствовует эффективному сгоранию бора [37,40].…”

Point-to-Point Efficient Grafting Improved Compatibility of Boron-Based Fuel-Rich Propellants

“…Metal fuel 1−5 is an important source of energy in solid rocket propellants, and due to its high mass calorific value (59.0 MJ• kg −1 ) and bulk calorific value (137.8 MJ•L −1 ), boron has great advantages and vast prospects for its application in fuel-rich propellants. Compared with conventional hydrocarbon propellants, boron-containing fuel-rich solid propellants 6 can provide a greater specific impulse. However, in practical applications, the application of boron-rich solid propellants is greatly constrained.…”