Modifying the ignition, combustion and agglomeration characteristics of composite propellants via Al-Mg alloy additives

Liu, Lu; Ao, Wen; Wen, Zhan; Wang, Yang; Long, Yuexiao; Liu, Peijin; He, Guoqiang; Li, Larry K.B.

doi:10.1016/j.combustflame.2021.111926

Cited by 50 publications

(14 citation statements)

References 19 publications

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“…This alloy may increase the burn rate of HTPB/AP/ RDX/Al propellants from 2.2 to 3.11 mm s −1 under 1 MPa. 18 Apart from Al-based alloys, surface modification of Al using transition metals (TMs) 22,23 has also shown promising results, as it enables intermetallic reactions that generate a significant amount of heat release when Al reacts with TMs. 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.…”

Section: Introductionmentioning

confidence: 99%

“…Another method involves alloying Al with other metals, which has been proven to be effective in improving the ignition and combustion of Al particles. Various Al-based alloys, such as Al–Li, , Al–Mg, , and Al–Zn, have been developed. Al-based alloys have a lower ignition temperature with an enhanced combustion efficiency due to microexplosion, exothermic alloying/oxidation channels, and exothermic reactions of intermetallic reactions .…”

Section: Introductionmentioning

confidence: 99%

“…Al–Mg alloys, for example, exhibited a higher heat release of up to 10.77 kJ g –1 and shorter ignition delay time in the presence of 10% Mg. This alloy may increase the burn rate of HTPB/AP/RDX/Al propellants from 2.2 to 3.11 mm s –1 under 1 MPa . Apart from Al-based alloys, surface modification of Al using transition metals (TMs) , has also shown promising results, as it enables intermetallic reactions that generate a significant amount of heat release when Al reacts with TMs.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Al-Mg alloys have been used extensively in the fabrication of seawater facilities (such as ship hulls), armor plating, rail cars, and storage tanks because of their characteristic high specific strength, good corrosion resistance, and weldability. The mechanical properties of the Al-Mg alloys can be improved by the addition of elements such as Mn and Cr [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Metallurgical and Mechanical Characteristics of an AA5183 Alloy Plate Performed by a Cold Metal Low-Power Additive Manufacturing Technology

Jia

Hayat

et al. 2023

Crystals

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In this work, an AA5183 alloy plate was successfully deposited by low-power cold metal transfer technology. The forming defects, microstructural characteristics, and mechanical properties were investigated. The results show that the number of defects increases gradually along the building direction of the deposited plate. X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, electron probe microanalysis, electron backscatter diffraction, and transmission electron microscopy were employed to study the distribution of alloying elements, deposited microstructural characteristics, and the crystal structure of intermetallic compounds in the Al alloy plate. The tensile samples perpendicular to the building direction presented greater tensile strength and superior plasticity compared to those parallel to the deposition direction. The average UTS was 327 ± 0.65 MPa and the average EL was 30.6 ± 2.0%. The UTS of conventionally forged 5083-H32 (Al-Mg4.5) alloy is 324 MPa; the UTS of extruded 5083-H116 (Al-Mg4.5) alloy is 305 MPa. Further, the strength of our prepared plate reaches the value needed for industrial applications of the 5083 Al alloy. The differences in the strength and plasticity of the samples assessed under multiple sampling methods were analyzed based on a synergistic strength–ductility mechanism.

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“…Mg has the advantages of low ignition temperature, stable combustion, high combustion efficiency and low price, so it has become a widely used metal fuel in pyrotechnics, propellants and combustion agents [1][2][3]. In recent years, with the increasing requirements for energetic materials, for some formulations using Mg as fuel, improving the ignition and combustion performance and the energy density of the formulations have become the focus of researches [4][5][6][7]. The use of Mg alloys has become an effective mean [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of CuO powder on the combustion and micro-explosion of Mg and Al12Mg17 particles

Xie¹,

Zhang²,

Ma³

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, the effects of CuO powder on the combustion and micro-explosion characteristics of Mg and Al12Mg17 were studied. A laser was used to ignite particles and a high-speed micro-camera was used to record the particle ignition, flame propagation, combustion and particle changes before and after micro-explosion. Moreover, emission spectra during combustion and combustion products were analysed. The results show that the addition of CuO contributes to the micro-explosion of Mg particles during combustion, but it is not conducive to the micro-explosion of Al12Mg17 particles. Meanwhile, whether Al12Mg17 particles or Al12Mg17/CuO particles, the radiation peaks during combustion mainly correspond to Mg or MgO, which means that the addition of CuO cannot promote the gas phase combustion of Al in Al12Mg17.

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Modifying the ignition, combustion and agglomeration characteristics of composite propellants via Al-Mg alloy additives

Cited by 50 publications

References 19 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

Metallurgical and Mechanical Characteristics of an AA5183 Alloy Plate Performed by a Cold Metal Low-Power Additive Manufacturing Technology

Effect of CuO powder on the combustion and micro-explosion of Mg and Al12Mg17 particles

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