Boron and Polytetrafluoroethylene as a Fuel Composition for Hybrid Rocket Applications

Connell, Terrence L.; Risha, Grant A.; Yetter, Richard A.; Roberts, Colin W.; Young, Glenn M.

doi:10.2514/1.b35200

Cited by 37 publications

(14 citation statements)

References 54 publications

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“…In studies aimed at studying ignition and combustion at high pressures [13] or under conditions close to real ones [1,13] the conductive initiation (for example, heating with nichrome filament or hot gases in TGA chamber) was used. It was established that with an increase in the pressure and content of boron particles to 20 mass.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

2018

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Abstract. Boron and its compounds are among the most promising metal fuel components to be used in solid propellants for solid fuel rocket engine and ramjet engine. Papers studying boron oxidation mostly focus on two areas: oxidation of single particles and powders of boron, as well as boroncontaining composite solid propellants. This paper presents the results of an experimental study of the ignition and combustion of the high-energy material samples based on ammonium perchlorate, ammonium nitrate, and an energetic combustible binder. Powders of aluminum, amorphous boron and aluminum diboride, obtained by the SHS method, were used as the metallic fuels. It was found that the use of aluminum diboride in the solid propellant composition makes it possible to reduce the ignition delay time by 1.7-2.2 times and significantly increase the burning rate of the sample (by 4.8 times) as compared to the solid propellant containing aluminum powder. The use of amorphous boron in the solid propellant composition leads to a decrease in the ignition delay time of the sample by a factor of 2.2-2.8 due to high chemical activity and a difference in the oxidation mechanism of boron particles. The burning rate of this sample does not increase significantly.

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Section: Matec Web Of Conferencesmentioning

confidence: 99%

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

2018

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“…Fluoropolymer binders are also widely used in reactive material formulations where they serve as the binder and/or oxidizer . An example is Viton (a copolymer of VDF and Hexafluoropropylene (HFP)) in combination with Magnesium and Teflon to form MTV, a high performing reactive …”

Section: Introductionmentioning

confidence: 99%

“…Nanoscale aluminum, with its high adiabatic flame temperature (3764 K) and heat of fluorination (56.01 KJ g −1 ) has also been shown to increase the burn rate of the reactive composite and decrease the diffusion time creating a more efficient and a highly reactive system . This highly exothermic system has previously been explored over a wide range of compositions with regard to the stoichiometric ratio of fluorine to Al . Initial efforts indicated that these materials could be sensitized by the application of a voltage, of which, the mechanism was hypothesized to be the highly piezoelectric nature of the fluoropolymer .…”

Section: Introductionmentioning

confidence: 99%

Smart Energetics: Sensitization of the Aluminum‐Fluoropolymer Reactive System

Row

Groven

2017

Adv Eng Mater

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The development of smart energetics is at the forefront of the research community. The desire is to have energetics that could have ON/OFF capability, tunable performance, and/or targeted energy delivery. Therefore, efforts have been focused on designing systems that respond to stimuli in a controlled manner. In this paper, nanoscale aluminum (nAl)/fluoropolymer reactive systems are studied and the piezoelectric nature of the fluoropolymers is used as a means to sensitize the system. Using a capacitor type setup, and drawing on our previous efforts, three fluoropolymer/nAl systems are studied and their sensitivities upon application of a DC voltage are quantified using BAM drop weight as the indicator. It is found, upon application of 1.0 kV, that for all three fluoropolymer/Al systems the sensitivity is greatly increased. For example, for the THV221/nAl system the impact energy required for ignition is reduced from 63 to 10 J. Further increasing the applied voltage is shown to further increase the sensitivity for all systems studied. The role of electroactive phase content and sensitization time is also discussed.

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“…Boron and its compounds are considered to be fuel components with high efficiency for use in solid propellants for solid fuel rocket and ramjet engines [1][2][3]. Boron hydrides and organic derivatives have the high burning rates in a wide range of oxidizing medium compositions and pressure values.…”

Section: Introductionmentioning

confidence: 99%

Laser ignition of high-energy materials containing AlB₂and AlB₁₂powders

et al. 2017

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Abstract. Boron-containing substances are known to have high gravimetric and volumetric heats of oxidation in comparison with any metals that make them promising for using in high-energy materials. This work is aimed to study ignition characteristics of ammonium perchlorate and nitrate-based composite solid propellants containing aluminium borides by means of radiative heating by CO 2 -laser. It was found that the effect upon laser ignition (ignitability) at full replacement of ASD-4 aluminum powder by aluminium diboride and dodecaboride is close. The ignition time of HEM is reduced by 2.0-2.5 times compared with ASD-4 HEM sample in the heat flux density range of 90-200 W/cm 2 .

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Boron and Polytetrafluoroethylene as a Fuel Composition for Hybrid Rocket Applications

Cited by 37 publications

References 54 publications

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

Smart Energetics: Sensitization of the Aluminum‐Fluoropolymer Reactive System

Laser ignition of high-energy materials containing AlB₂and AlB₁₂powders

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Boron and Polytetrafluoroethylene as a Fuel Composition for Hybrid Rocket Applications

Cited by 37 publications

References 54 publications

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

Ignition and combustion of high-energy materials containing aluminum, boron and aluminum diboride

Smart Energetics: Sensitization of the Aluminum‐Fluoropolymer Reactive System

Laser ignition of high-energy materials containing AlB2and AlB12powders

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Product

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Laser ignition of high-energy materials containing AlB₂and AlB₁₂powders