Fabrication and Characterization of Viton@FOX-7@Al Spherical Composite with Improved Thermal Decomposition Property and Safety Performance

Li, Xiaodong; Yang, Yourong; Song, Changgui; Sun, Yi-Zhi; Han, Yuanqi; Zhao, Yue; Wang, Jingyu

doi:10.3390/ma14051093

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…However, compared with the current propellant formulations, the introduction of new components through the aforementioned methods may lead to energy loss, thermal compatibility issues between components, and poor mechanical strength. Therefore, commonly used energetic materials such as RDX, − AP, , HMX, and FOX-7 have been adopted to obtain Al-based composites for superior thermal reactivity and combustion performance. The incorporation of Al@RDX can significantly enhance the combustion process of HTPB-based propellants, resulting in a 32.6% increase in burn rate (1 MPa) and an 88.3% elevation in flame temperature .…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Ignition and Combustion Performances of Solid Propellants Incorporating Al Particles Inside Oxidizers

Xu,

Yu,

Xue

et al. 2023

ACS Appl. Mater. Interfaces

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The combustion efficiency of Al plays a critical role in the combustion of high-energy aluminum-based solid propellants. For traditional formulations, the Al powders are dispersed in the binder matrix, leading to limited contact with the oxidizers and hence usually insufficient combustion and higher values of the pressure exponent. In this paper, various core–shell structural Al/oxidizer composites such as Al@HMX, Al@AP, and AP@Al have been prepared by a spray-drying technique based on which solid propellants with precise interfacial control between Al particles and oxidizers were realized. Compared to the control sample, the modified propellants have a greater heat of explosion of 5890 J g–1 (15% higher) and a reduced ignition delay time of 58 ms (65% decrease). Without changing the content of components, the burn rates of propellants can be easily modulated by tuning the interfacial contact of Al and oxidizers, where it varies in a wide range of 4.56–5.79 mm s–1 at the same pressure of 1 MPa. After introducing Al/oxidizer composites, the lowest pressure exponent of 0.19 within 1–15 MPa could be achieved by using Al@HMX and AP@Al composites. The agglomeration of Al was also inhibited by using Al/oxidizer composites, and the mechanism can be interpreted by using a classical “pocket” model. Moreover, the improved combustion efficiency of the solid propellants was verified by a noticeable reduction in the unreacted Al content.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Ignition and Combustion Performances of Solid Propellants Incorporating Al Particles Inside Oxidizers

Xu,

Yu,

Xue

et al. 2023

ACS Appl. Mater. Interfaces

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“…For example, a Polymer Bonded Explosive (PBX) can be created by combining novel binders like GAP with energetic components already found in flexible polymeric matrices known as binders (glycidyl azide polymer). TATB, NTO, ADN, HNIW, and CL20 are all examples of inherently low-sensitive energetic compounds that can be used to make explosives [9][10][11][12][13][14][15][16][17][18][19]. TATB, NTO, ADN, HNIW, and CL20 are all examples of intrinsically low-sensitive energetic components that can be used to make explosives.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Synthesis of Low Sensitive FOX-7 with a high % yield

Abdelhafiz

Mostafa

2022

J. Phys.: Conf. Ser.

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Attaining a high performance is one of the most seeking demands in the energetic materials field. However, achieving that goal while keeping a high level of safety became a serious puzzle. 1,1-diamino-2,2-dinitroethene (FOX-7) could be a promising candidate to solve that issue regarding its favorable explosive characteristics together with its low vulnerability. However, its high cost and low yield obtained via the FOI method limit its use in the field of insensitive munition (IM). In this work, we propose a novel approach to synthesis the FOX-7 crystals with high purity, a relatively high yield, and an extremely low impact, friction, ignition sensitivities. The obtained crystals were characterized using FTIR Spectroscopy, Proton NMR Spectroscopy, IKA impact test apparatus, BAM friction test apparatus, Chilworth deflagration test apparatus, and the adiabatic calorific bomb. Results confirmed the successful preparation of pure FOX-7 crystals with a promising yield of 64%, in comparison to the yield of the FOI method of 55%, and extremely low sensitivities using our proposed approach.

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“…Aluminum powder plays an important role in energetic materials, due to its high combustion calorific value, low price, and high energy density [ 1 , 2 , 3 , 4 ]. At the same time, Aluminum is the most abundant crustal metal on Earth and can be fully recycled, which gives it good potential for hydrogen production [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Energetic and Protective Coating via Chemical and Physical Synergism for High Water-Reactive Aluminum Powder

et al. 2022

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Aluminum powder plays important role in the field of energetic materials. However, it is often vulnerable to oxygen and water due to the high reactivity of aluminum, and it is challenging to build up uniform and passivated coating via existing means. In this work, (Heptadecafluoro-1,1,2,2-tetradecyl) trimethoxysilane (FAS-17) and glycidyl azide polymer (GAP) were used to coat the surface of high water-reactive aluminum powder (w-Al) to form inactivated w-Al@FAS-17@GAP energetic materials, via the synergy of chemical bonding and physical attraction. Thermal reaction tests showed that the exothermic enthalpy of w-Al@FAS-17@GAP was 5.26 times that of w-Al. Ignition tests showed that w-Al@FAS-17@GAP burnt violently at 760 °C, while w-Al could not be ignited even at 950 °C. In addition, the combined coating of FAS-17 and GAP could effectively improve the hydrophobicity and long-term stability of w-Al, which helped to overcome the poor compatibility of w-Al with explosive components. Our work not only displayed an effective routine to synthesize O2/H2O proof Al energetic materials, but also pointed out a synergistically chemical and physical strategy for constructing intact high-performance surfaces.

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Fabrication and Characterization of Viton@FOX-7@Al Spherical Composite with Improved Thermal Decomposition Property and Safety Performance

Cited by 6 publications

References 30 publications

Enhancing the Ignition and Combustion Performances of Solid Propellants Incorporating Al Particles Inside Oxidizers

Enhancing the Ignition and Combustion Performances of Solid Propellants Incorporating Al Particles Inside Oxidizers

A Novel Approach for Synthesis of Low Sensitive FOX-7 with a high % yield

Energetic and Protective Coating via Chemical and Physical Synergism for High Water-Reactive Aluminum Powder

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