Effect of Organic Fluoride on Combustion Agglomerates of Aluminized HTPB Solid Propellant

Abstract

Hydroxyl‐terminated polybutadiene (HTPB) based propellants containing fixed aluminum content (18 wt %) and different amounts of organic fluoride (OF) additive were studied. Explosion heat of propellant samples and particle size distribution of the solid combustion products were experimentally measured to generally assess the effect of the organic fluoride compounds on propellants. Heats of explosion decreased approximately by 9.5 %, from 7209 (±259) to 6525 (±146) kJ kg−1, with the increase in OF content from 0 % to 6 %, and the volume fraction of particles size above 10 μm was sharply decreased. In addition, scanning electron microscope images showed the solid combustion products to be well separated, the titration analysis results also gave the amount of unburned metallic aluminum decreased. These results indicated that OF as an additive would be helpful to reduce agglomeration in the combustion products of aluminized HTPB propellants. Furthermore, a mechanism for suppression of agglomerate size can be postulated based on the X‐ray diffraction analysis data that addition of OF promotes increased content of γ‐Al2O3 (aluminum oxide) in the solid combustion products.

Effect of Morphology for Ammonium Dinitramide on the Mechanical and Combustion Properties of Composite Propargyl‐terminated Copolyether Propellant

“…The flame shape of both propellants were similar, their combustion was stable. The bright particles, which is formed by the combustion of the aluminum particles from the burning surface into the flame zone, were scattered in the flame zone .…”

“…The flame shape of both propellants were similar, their combustion was stable. The bright particles, which is formed by the combustion of the aluminum particles from the burning surface into the flame zone, were scattered in the flame zone [34,35]. However, the scattering of aluminum particles in the flame zone with the spherical ADN or the flaky ADN were different.…”

AgI–KI aerosol catalysts with excellent combustion and nucleation performance for weather modification

“…The aerosols with and without AgI-KI catalyst were fabricated via simple pouring method (Details shown in Experimental parts and Figure 1). In this work, the commonly employed .0 0.0 AP/HTPB solid composite propellants were adopted [34][35][36] , where AP acts as the oxidizer to produce high energy when being ignited, HTPB as the binder to form polymer matrix, and TDI as the curing agent to solidify the matrix. To make comparison, aerosols with and without AgI-KI catalyst were both fabricated.…”

Investigation of the agglomeration reduction mechanism of the aluminized HTPB propellant containing ferric perfluorooctanoate [Fe(PFO)3]

“…The generation of more uniform-sized "small" particles and the reduced agglomeration of Al could infer that there was less mass fraction of active Al in the solid combustion products of the formulation containing Fe(PFO) 3 , according to our previous study. 24…”