The rapid H2 release from AlH3 dehydrogenation forming porous layer in AlH3/hydroxyl-terminated polybutadiene (HTPB) fuels during combustion

Chen, Suhang; Tang, Yu; Yu, Hongqiang; Bao, Liwei; Zhang, Wei; DeLuca, Luigi T.; Shen, Ruiqi; Ye, Yinghua

doi:10.1016/j.jhazmat.2019.02.045

Cited by 66 publications

(33 citation statements)

References 36 publications

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“…The released H2 can be used for combustion and the remaining base metal can further react and combust, thus adding more thermal energy to the system. Experimental results in Table 10 and Reference [29] confirm a previously unreported porous layer mechanism of AlH3 improving combustion. A 50 μm thickness porous layer in AlH3/HTPB melting layer, which is exposed by rapidly released gas phase H2 transferring from AlH3 dehydrogenation during combustion, is determined by SEM and other techniques.…”

Section: Porous Layer Combustion Fuelssupporting

confidence: 71%

“…The 2D-radial hybrid combustion burner ( Figure 1) was previously described [26][27][28][29][30][31][32] and is based on the original design by SPLab [33,34]. Gaseous nitrogen is used to stabilize the chamber pressure during combustion and terminate the HTPB-O 2 reaction after turning off oxygen, while compressed air is used to save nitrogen before combustion and cool off the chamber after combustion.…”

Section: Combustion Characterizationmentioning

confidence: 99%

“…In this framework, a series of innovative techniques is currently under investigation at Nanjing University of Science and Technology (NUST) in order to overcome the solid fuel deficiencies so far experienced. Shen et al [26][27][28][29][30][31][32] verified new concepts such as:…”

Section: Introductionmentioning

confidence: 99%

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Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

et al. 2019

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The low regression rates for hydroxyl-terminated polybutadiene (HTPB)-based solid fuels and poor mechanical properties for the alternative paraffin-based liquefying fuels make today hybrid rocket engines far from the outstanding accomplishments of solid motors and liquid engines. In this paper, a survey is conducted of several innovative methods under test to improve solid fuel properties, which include self-disintegration fuel structure (SDFS)/paraffin fuels, paraffin fuels with better mechanical properties, high thermal conductivity fuels and porous layer combustion fuels. In particular, concerning HTPB, new results about diverse insert and low-energy polymer particles enhancing the combustion properties of HTPB are presented. Compared to pure HTPB, regression rate can be increased up to 21% by adding particles of polymers such as 5% polyethylene or 10% oleamide. Concerning paraffin, new results about self-disintegrating composite fuels incorporating Magnesium particles (MgP) point out that 15% 1 μm- or 100 μm-MgP formulations increase regression rates by 163.2% or 82.1% respectively, at 335 kg/m2·s oxygen flux, compared to pure paraffin. Overall, composite solid fuels featuring self-disintegration structure appear the most promising innovative technique, since they allow separating the matrix regression from the combustion of the filler grains. Yet, the investigated methods are at their initial stage. Substantial work of refinement in this paper is for producing solid fuels to fulfill the needs of hybrid rocket propulsion.

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Section: Porous Layer Combustion Fuelssupporting

confidence: 71%

Section: Combustion Characterizationmentioning

confidence: 99%

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Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

et al. 2019

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“…At 89.0 ms, a unique green flame from the combustion of boron was seen around the yellow flame, although it was weak. Some researchers pointed out that a green flame indicates the formation of BO 2 during the combustion of boron. The most intense combustion occurred at 120.2 ms, then the combustion extinguished gradually and ended at 296.0 ms.…”

Section: Resultsmentioning

confidence: 99%

“…A large amount of HF were released, where HF could react with Al 2 O 3 (bp. 2980 °C) and B 2 O 3 (bp. 1860 °C) on the surface of Al and B NPs to form low boiling point AlF 3 (bp.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Combustion Performance of B/PVDF/Al Composite Microspheres

Cheng

Huang

Yang

et al. 2019

Propellants Explo Pyrotec

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In order to solve the problems that boron nanoparticles (B NPs) are easy to agglomerate, low in combustion efficiency and difficult to ignite, 80 nm B NPs were doped with 50 nm aluminum nanoparticles (Al NPs) by electrospraying using 10 wt % PVDF as binders. The prepared B/PVDF/Al composite microspheres with diameter of 1∼5 μm were examined by scanning electron microscopy (SEM). Elemental maps confirmed the uniform distribution of B and Al NPs with the coating of polyvinylidene fluoride (PVDF). The thermal properties were tested by thermogravimetry‐differential scanning calorimetry (TG‐DSC), and the combustion process of samples in air was recorded by a high‐speed camera. The results showed that PVDF can reacted with the oxide layer on the surface of Al (Al2O3) and B (B2O3) NPs to promote the combustion and energy release of B/PVDF/Al. In addition, the thermal reactivity of B/PVDF/Al increased as the Al NPs content increases. Al NPs could reduce the ignition energy of B/PVDF/Al, allowing it to burn stably in air. A thermal reaction mechanism was proposed to explain qualitatively the four‐stage pattern of B/PVDF/Al decomposition observed in TG‐DSC curves.

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H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

Bai

Cao

et al. 2022

Energy Tech

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To adjust the hydrolysis H2 generation properties of as‐cast Mg–10wt%Ni (Mg10Ni) alloy, intermediate alloys Mg–Ce and Mg–La are introduced to prepare Mg9Ni10Ce and Mg9Ni10La. The H2 generation thermodynamics are investigated based on microstructures, electrochemical polarization properties, and fitted information of hydrolysis curves by Avrami–Erofeev and Arrhenius equations. The results indicate that Ni/La/Ce alloying elements can modify the microstructures of the Mg matrix by forming active phases Mg2Ni and Mg12Ce or Mg17La2, phase boundaries, and α‐Mg solid‐solution. The H2 generation capacities of Mg10Ni, Mg9Ni10Ce, and Mg9Ni10La are 532, 511, and 444 mL g−1 with 0.63, 0.68, and 0.59 conversion yields in 2.5 h at 293 K in NaCl solution. The conversion yields of Mg10Ni, Mg9Ni10La, and Mg9Ni10Ce can be promoted to 0.88, 0.91 and 0.99 at 308 K with 741, 756 and 690 mL g−1 H2, respectively. Due to the high content of eutectic structure and active phase as well as the stronger electrochemical hydrolysis tendency, the modification effect of La is better than Ce. The microstructure–property relationship and thermodynamics built herein can provide an effective strategy to regulate Mg‐based alloys to achieve a high conversion yield and rapid rate by electrochemical hydrolysis H2 generation.

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The rapid H2 release from AlH3 dehydrogenation forming porous layer in AlH3/hydroxyl-terminated polybutadiene (HTPB) fuels during combustion

Cited by 66 publications

References 36 publications

Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

Preparation and Combustion Performance of B/PVDF/Al Composite Microspheres

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

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The rapid H2 release from AlH3 dehydrogenation forming porous layer in AlH3/hydroxyl-terminated polybutadiene (HTPB) fuels during combustion

Cited by 66 publications

References 36 publications

Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

Innovative Methods to Enhance the Combustion Properties of Solid Fuels for Hybrid Rocket Propulsion

Preparation and Combustion Performance of B/PVDF/Al Composite Microspheres

H2 Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

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Product

Resources

About

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution