Characterization of aluminum nanopowders after long-term storage

Nazarenko, Olga B.; Amelkovich, Yuliya A.; Sechin, A.I.

doi:10.1016/j.apsusc.2014.10.034

Cited by 31 publications

(12 citation statements)

References 35 publications

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“…Previous researches show that major breakthroughs have been made in pyrotechnics, explosives, and propellants after addition of ANPs . Not only the high reactivity but also the stability of ANPs is of crucial significance for the practical engineering applications since they can be easily oxidized in air and thus loss the reactivity . Consequently, concerns arise in whether the energetic system containing ANPs can keep a high‐energy level after long‐term storage.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

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The stability of aluminum (Al) nanoparticles (ANPs) is a key issue that can determine the energetic properties of Al‐based energetic materials. In this study, a surface functionalization approach is employed, using the chemical adsorption and auto polymerization effects of the 1H, 1H, 2H, 2H‐perfluorodecyltriethoxysilane (FAS‐17), to set up a highly stable barrier coating to water and further endow ANPs with long‐term storage stability and self‐activation reaction capability. The FAS‐17‐modified ANPs (AFNPs) with a superhydrophobic surface show their excellent stability in air and unique strengths in corrosion resistance to water by enhancing diffusion resistance of O2 and preventing the hydration reaction. In terms of energetic performances, compared to the two‐step slow oxidation of ANPs, the heat‐release rate of AFNPs is significantly enhanced, resulting in a drastic oxidation process profiting from the surface reaction between the FAS‐17 and alumina (Al2O3) layer. More importantly, the ignition and combustion properties of AFNPs are also greatly improved, which can undergo self‐propagation combustion with a fairly high energy output even after stored in water. At last, the possible mechanisms of oxidation resistance and self‐activation reaction capacities are also proposed.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Guo²,

Gou³

et al. 2019

Adv Materials Inter

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“…During cold compaction, the green compacts of the unreinforced and blended powders fractured into thin, nearly horizontal slices, as shown in Figure 6. This was attributed to natural ageing of the 2124-Al alloy powder due to long-term storage (Nazarenko et al, 2014). The powders were then exposed to an over-ageing heat treatment at 350°C for 2 hours in order to reverse the effects of ageing.…”

Section: Deformation Behaviour Of Aluminium Low-micron Mmcs and Mmncsmentioning

confidence: 99%

Deformation behaviour of aluminium low-micron MMCs and MMNCs at warm working temperatures (0.3-0.5 Tm)

Gxowa

Chown

Govender³

et al. 2016

J. South. Afr. Inst. Min. Metall.

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“…As newly prepared Al nanoparticles are further exposed to heat, moisture, light, or other factors in practical applications, they would undergo physical and chemical transformations, i. e. ageing. The naturally aged Al nanoparticles received a considerable reduction of the active aluminum content and the reactivity, during storage over one year under natural conditions in air at room temperature and atmospheric pressure [8,9]. Moreover, the ageing of Al nanoparticles in the presence of air and humidity under strong accelerated conditions still produced a marked clustering, alterations in the particle morphology, and oxide film thickness; the major product of hydrolysis was bayerite Al(OH) 3 rather than Al 2 O 3 [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating Rate on Ignition Characteristics of Newly Prepared and Aged Aluminum Nanoparticles

Jin

Yang

et al. 2020

Propellants Explo Pyrotec

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Aluminum (Al) nanoparticles have been widely applied in propellants, but the ageing of Al nanoparticles will result in the degradation of propellant ignition performance. This paper experimentally investigates the ignition characteristics of newly prepared and aged Al nanoparticles, and improves the ignition performance of aged Al nanoparticles through elevating the heating rate. It was observed that, despite newly prepared or aged Al nanoparticles, their ignition included three stages: stage I – heating, stage II – melting, and stage III – evaporation. The temperature rise and time in stage I, melting temperature, and time in stage II and ignition temperature in stage III were separately discussed. It is found that the duration of each stage during the ignition of aged Al nanoparticles was much longer than that of newly prepared Al nanoparticles, testifying that ignition temperature of Al nanoparticles increased and ignition delay time elongated due to ageing. At elevated power density, the heating rate of Al nanoparticles increased, the heating, melting, and evaporating time shortened. The difference of ignition delay time between newly prepared and aged Al nanoparticles was significantly reduced. It means that the ignition performance can be improved through increasing the heating rate. Simultaneously, the energy conversation equation of each stage was built and discussed. It will be beneficial to deeply understand the ignition process and reveal the ignition mechanism of aged Al nanoparticles.

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Characterization of aluminum nanopowders after long-term storage

Cited by 31 publications

References 35 publications

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Superhydrophobic Fluorine‐Containing Protective Coating to Endow Al Nanoparticles with Long‐Term Storage Stability and Self‐Activation Reaction Capability

Deformation behaviour of aluminium low-micron MMCs and MMNCs at warm working temperatures (0.3-0.5 Tm)

Effect of Heating Rate on Ignition Characteristics of Newly Prepared and Aged Aluminum Nanoparticles

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