Tailoring the reactivity of printable Al/PVDF filament

Collard, Diane; Fleck, Trevor J.; Rhoads, Jeffrey F.; Son, Steven F.

doi:10.1016/j.combustflame.2020.09.016

Cited by 34 publications

(15 citation statements)

References 19 publications

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“…Most of the recent works devoted to the use of FDM for the creation of HEM products are focused on the use of poly (vinylidene fluoride) (PVDF), which can serve both as a filament backbone in printing and as an oxidizing agent during the reaction [ 34 , 35 , 36 , 37 ]. In particular, nano-aluminum (n-Al) and polyvinylidene fluoride (PVDF) are attractive fuel and oxidizing materials due to the high energy density of n-Al as well as high oxidation potential and excellent mechanical properties offered by PVDF [ 38 ].…”

Section: High-energy Composite Additive Manufacturing Technologiesmentioning

confidence: 99%

“…Another possible role for the polymeric binder lies in increasing the energy of the composition if the binder reacts with the filler particles. For example, fluoropolymers oxidize aluminum [ 36 , 66 , 67 , 68 ], and 80% more energy is generated in the process as compared to the formation of aluminum oxide [ 11 ].…”

Section: Reactive Materials For Printing Problems Of Their Preparation and Usementioning

confidence: 99%

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Review of the Problems of Additive Manufacturing of Nanostructured High-Energy Materials

et al. 2021

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This article dwells upon the additive manufacturing of high-energy materials (HEM) with regards to the problems of this technology’s development. This work is aimed at identifying and describing the main problems currently arising in the use of AM for nanostructured high-energy materials and gives an idea of the valuable opportunities that it provides in the hope of promoting further development in this area. Original approaches are proposed for solving one of the main problems in the production of nanostructured HEM—safety and viscosity reduction of the polymer-nanopowder system. Studies have shown an almost complete degree of deagglomeration of microencapsulated aluminum powders. Such powders have the potential to create new systems for safe 3D printing using high-energy materials.

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Section: High-energy Composite Additive Manufacturing Technologiesmentioning

confidence: 99%

Section: Reactive Materials For Printing Problems Of Their Preparation and Usementioning

confidence: 99%

Review of the Problems of Additive Manufacturing of Nanostructured High-Energy Materials

et al. 2021

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“…More recently, additive manufacturing of nAl/fluoropolymer composites has enabled unique geometries and tailorability for Al/fluoropolymer additives. These 3D printed materials can be included in energetic systems for enhanced reactivity or burning rate, and have also been used as reactive wires embedded within solid propellant [36][37][38][39][40]. Of specific interest for this paper are fluoropolymer coating methods as the resulting composites can themselves be introduced in powdered form into a hydrocarbon binder matrix.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Fluorine‐Containing Nano‐Aluminum Composite Particles to Tailor Composite Solid Rocket Propellants

Uhlenhake

Yehia

Noel

et al. 2022

Propellants Explo Pyrotec

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The burning rate of solid propellants is an important factor for optimizing rocket motors and improving performance. The enhanced burning rate can increase thrust and reduce a propulsion system's overall size and weight. In this study, a novel nano-aluminum/THV composite additive was prepared and introduced into a solid ammonium perchlorate/polybutadiene composite solid rocket propellant to enhance its burning rate. The morphology of the composite particle additive and its effects on combustion were characterized. The use of small quantities (< 15 wt.%) of the additive resulted in a burning rate enhancement of up to 2.1 times that of the conventional coarse aluminized propellant with a specific impulse loss of only 3 seconds, and as much as 4.7 times enhancement with a predicted loss of 22 seconds in theoretical specific impulse. Some of this loss may be recovered by the improved combustion efficiency in smaller rocket motors because the additive was shown to significantly reduce the aluminum agglomeration at the propellant burning surface and reduce the size of reaction products which may reduce two-phase flow losses. The additive also provides wide burning rate tailorability, favorable for motor, grain, and thrust curve design. The burning rate enhancement mechanism is thought to be a physical cratering mechanism governed by the burning rate disparity between the binder/oxidizer system and the nano-aluminum/fluoropolymer additive and not a chemical catalytic effect.

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“…Not only the printing architecture impacts the energy release and combustion performance but also the binder, even though it is added in the minimum quantity necessary to provide structural integrity to the thermite formulations and afford stable reactive films, plays an important role in particle mixing, deposition thickness, and density, all of which affect the flame temperature, burn rate, and energy release rate. Groven et al and Son et al ,, have both shown success in printing fluoropolymer-based reactive material. Meeks et al successfully synthesized and characterized the burn rate of thick Mg/MnO 2 thermite films mixed with different binders (polyvinylidene fluoride (PVDF)–methyl pyrrolidone (NMP); Vitonfluoroelastomer (Viton A)).…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on the Properties of Direct Written Gas-Generating Reactive Layers

Sevely¹,

Liu

Wu³

et al. 2021

ACS Appl. Polym. Mater.

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A mixture of copper complex and Al/CuO nanothermite, Al/CuO/CuC, represents one state-ofthe-art gas-generating thermite systems with various pyrotechnic applications with respect to their tunable gas release rates. The reactivity of reactive inks with various loading of polyvinylpyrrolidone (PVP) binder mixed with Al/CuO/CuC is characterized using high-speed imaging diagnostics and pressure measurement. For a PVP mass fraction < 7 wt%, the printed materials remain highly reactive and burn at a high velocity (10 -54 m/s) which was one of the important goals in this study. At higher PVP content, the polymer inhibits the reaction. Printing (dropwise and continuously writing) of inks containing 5 wt% of PVP and 95 wt% of reactive Al/CuO/CuC powder was demonstrated using volumetrically controlled dispenser and pneumatically actuated syringe. The pressure development and burning rates of the printed materials are 0.37 MPa (at 46.3% TMD) and 17 m/s (at 0.24% TMD), more than a 10 times faster than the majority of works dealing with printed energetic formulations.

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Tailoring the reactivity of printable Al/PVDF filament

Cited by 34 publications

References 19 publications

Review of the Problems of Additive Manufacturing of Nanostructured High-Energy Materials

Review of the Problems of Additive Manufacturing of Nanostructured High-Energy Materials

On the Use of Fluorine‐Containing Nano‐Aluminum Composite Particles to Tailor Composite Solid Rocket Propellants

Effect of Process Parameters on the Properties of Direct Written Gas-Generating Reactive Layers

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