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HNF/HTPB propellants: Influence of HNF particle size on ballistic properties

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Author: Heijden, A.E.D.M. van der · Leeuwenburgh, A.B.
Institution: TNO Defensie en Veiligheid
Source:Combustion and Flame, 7, 156, 1359-1364
Identifier: 90031
doi: doi:10.1016/j.combustflame.2009.03.007
Keywords: Ballistics · Ballistic properties · Oxidizer size · Propellants · Ballistic properties · Burning rate · Coarse particles · Grinding process · Hydrazinium nitroformate · Hydroxyl-terminated polybutadiene · Mean size · Oxidizer size · Pressure exponents · Propellant burning rate · Solid composites · Thermal stability · Ballistics · Butadiene · Explosives · Particle size · Propellants · Stability · Spacecraft propulsion · 1,3 butadiene derivative · hydrazine derivative · article · combustion · controlled study · grinding · particle size · priority journal · thermostability


The burning rate characteristics of solid composite propellants can be modified via different methods. One of these is the application of different oxidizer particle sizes in the propellant. The effect of the use of fine and coarse particles of the oxidizer hydrazinium nitroformate (HNF) in hydroxyl-terminated polybutadiene (HTPB)-based propellants is reported in this paper. The fine HNF particles were obtained by means of a grinding process. The fine and coarse HNF grades were characterized regarding their hazardous and thermal stability properties, as well as the influence of a cured and uncured HTPB binder on these characteristics. The ballistic properties of three (two monomodal and one bimodal) HNF/HTPB-based propellants show that the use of fine HNF (5–10 μm mean size) leads to a lowering of the pressure exponent of the propellant, implying that the propellant burning rate can be tuned by varying the mean size of the HNF grades present in the propellant. © 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.