Application of Amorphous Boron Granulated With Hydroxyl‐ Terminated Polybutadiene in Fuel‐Rich Solid Propellant

Abstract

Amorphous boron powder granulated with HTPB, whose particle diameter could be controlled, was prepared by mechanical mill method. It was found that amorphous boron powder could be granulated with HTPB binder to form B‐HTPB particles, whose median particle diameter (d50) and specific surface area are in the range of 125.0–431.0 µm and 0.02–0.1 m2 g−1, respectively. The B‐HTPB particles could be dispersed in the HTPB binder with relatively low viscosity compared with direct addition of amorphous boron powder to the HTPB binder. The experimental results showed that the content of boron particles in a fuel‐rich propellant could be increased by addition of B‐HTPB particles and the combustion characteristics of the fuel‐rich solid propellant could be improved.

Procesibilnost livenih kompozitnih eksploziva

“…− huge increase in the viscosity of the mixture, until the consistency of a paste, − appearence of viscous boron oxide and boric acid, which is indicated by the literature in this field [18][19][20][21][22][23][24][25], − stickyness of the explosive samples after hardening.…”

“…These observations suggest that it is not enough to rely on microcalorimetric compatibility analysis, because some substances have interactions that are not accompanied by thermal effects which would be registered as an indicator of incompatibility. Because of these problems with the boron, it is cast in the compositions with a higher mass percentage of polymeric binder [21,22,25].…”

“…-octogene, HMX (DINO, Norway, class A/C), -aluminium, Al (Alcan TOYO, average particle diameter ~ 5 μm), -magnesium, Mg (ECKA GRANULES -Austria, average particle diameter ~ 16 μm), -boron, B (average particle diameter ~ 5 μm), -ammoniumperchlorate, AP (average particle diameter ~ 7 μm), -hydroxyl-terminated poly(butadiene) binder, HTPB, cured by isophoronediisocyanate, IPDI. Compositions PBX-05 -PBX-07 have higher content of the binder because of the boronwhen added into this kind of polymeric binder, it causes a rapid increase of the viscosity, so the resulting composition has the consistency of a paste [13].…”

“…Reactive metals such as aluminium or magnesium are most often used as fuel components in cast PBX compositions, especially in thermobarics [6,7]. Adding metal powders to explosive compositions provide significant increase of the effective energy from the explosion [7][8][9][10][11][12][13]. Best metal fuels are boron, beryllium and aluminium.…”

Preparation of TiO2-Decorated Boron Particles by Wet Ball Milling and their Photoelectrochemical Hydrogen and Oxygen Evolution Reactions

“…Boron has been employed as an energetic material for ramjet solid additives and for solid propellants of ducted rockets because of its exceptionally high combustion enthalpy per unit volume [ 1 , 2 , 3 ]. Boron has also been used as a catalyst additive and support material [ 4 , 5 , 6 , 7 , 8 , 9 ].…”