A New Hydroxyl-Terminated Fluorine-Containing Binder Based High Strength Aluminized Casting PBX as Potential Application in Penetrating Weapon Charge
H.-H. Liu1,2, S.-S. Zheng1, B. Xu3, G. Luo1, Y.-P. Bai2, S.-B. Li1, Y.-D. Huang2
1Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, China
2School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China
3The Rocket Force Military Delegate Office of Mianyang Area, Mianyang, China
Keywords: penetrating munitions charge, high-strength explosives, cast aluminized PBX, hydroxyl-terminated fluorinated binder, low vulnerability
Abstract
Penetrating munitions charges must meet stringent requirements, including high energy density, excellent mechanical properties, and low sensitivity to environmental influences. To increase the energy density of the aluminized explosive, a hydroxyl-terminated fluorinated oligomer (HTFB) was added to the cast PBX composition as a binder. Using a mix/pour/curing method with an 88% solids content, a curing system for aluminized cast PBX was developed and studied. Factors influencing the rheological characteristics, molding processes during curing, and the mechanical properties of the composition were studied. The mechanical and detonation characteristics of the resulting compositions were determined, as well as their sensitivity to external influences during limited storage time under conditions requiring rapid access to ammunition. The results showed that the PBX-361-C composition offers the best combination of pouring processability and cured casting quality. Its density, heat of detonation, and velocity of detonation are 1.962 g/cm3, 7 806 J/g, and 7 603 m/s, respectively. The tensile and compressive strengths of PBX-361-C are 9.33 and 37.53 MPa, respectively. During rapid and slow heating tests, as well as during bullet firing, the reaction of the composition was limited to combustion or weaker forms. The estimated shelf life of PBX-361-C at room temperature is 7,442 years. All the data obtained indicate the high potential of this composite system for use in penetrating munitions.
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