The Oxidation Mechanism of Pure Aluminum Powder Particles

Hasani, Saeed; Panjepour, Masoud; Shamanian, M.

doi:10.1007/s11085-012-9299-1

Cited by 113 publications

(64 citation statements)

References 22 publications

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“…At 1,250°C, the weight gain is the maximum attainable, according to the stoichiometric reaction of aluminium oxidation. For bigger particles (100-200 lm), it has been reported that complete oxidation process does not take place even up to 1,400°C [5]. After oxidation at 1,250°C (Fig.…”

Section: Fig 2 Weight Gains During 10 H Isothermal Dwellsmentioning

confidence: 93%

“…This suggests that the spheres are oxidizing at a slow rate. The cubic-FCC disordered structure of c-Al 2 O 3 transforms into the hexagonal close packed ordered structure of a-Al 2 O 3 , with a volume shrinkage of 13.8 % [5]. The microstructural analysis (Fig.…”

Section: Fig 2 Weight Gains During 10 H Isothermal Dwellsmentioning

confidence: 99%

“…Recently, a complete study [5] was published regarding the oxidation mechanisms of 100-200 lm aluminium particles, using TG, differential thermal analysis (DTA) and scanning electron microscopy (SEM). Different heating rates were studied, and 1,400°C was selected as maximum temperature.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to understand the behaviour of aluminium microparticles in air to understand the phenomena taking place during aluminizing. Although those transformations have been defined in previous cited works [2][3][4][5], they have not been studied for microparticles in air, up to 1,300°C. Furthermore, no SEM studies of aluminium microparticles have been included to show the changes in their morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, no SEM studies of aluminium microparticles have been included to show the changes in their morphology. Only Hasani et al [5] have included SEM images, but for particles 100-times larger than those used in this study.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

et al. 2013

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Oxidized aluminium microparticles have recently been proposed for manufacturing new, environmentally-friendly, protective coatings on stainlesssteels and Ni-base alloys. The oxidation mechanisms of spherical aluminium microparticles of an average particle size of 3.5 lm were studied. Accordingly, simultaneous differential thermal analysis-thermogravimetry tests were carried out in air at different temperatures, always above aluminium melting temperature. Scanning electron microscopy and XRD were also used for the interpretation of results. Weight gain and energy results were explained in terms of the different structural changes taking place in aluminium particles. Dehydroxylation process was identified. The transformation of amorphous alumina to c-Al 2 O 3 was numerically evaluated and the alumina phase transformation (c-Al 2 O 3 ?a-Al 2 O 3 ) was also studied. The temperature ranges revealed the appearance of metastable phases (h-Al 2 O 3 ). Complete oxidation of particles can be obtained at 1,300°C in \1 h, although this also takes place at lower temperatures if enough oxidation time is used. Activation energy of oxidation process at high temperature was also estimated, taking a value of 334 kJ/mol. High temperature oxidation causes the formation of hollow alumina spheres, without any aluminium left inside them.

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Section: Fig 2 Weight Gains During 10 H Isothermal Dwellsmentioning

confidence: 93%

Section: Fig 2 Weight Gains During 10 H Isothermal Dwellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

et al. 2013

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Preparation, Microstructure and Thermal Property of ZrAl₃/Al Composite Fuels

Zou

Shi

et al. 2019

Propellants Explo Pyrotec

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ZrAl 3 /Al composite fuels x = 10,20,30, 40, 50, 53 wt.%) were prepared by the non-consumable arcmelting technique and close-coupled gas-atomization. In order to study the effects of the zirconium content and the oxygen partial pressure on the thermal properties of composite fuels, X-ray diffraction, scanning electron microscopy, TG-DTA and DSC were used to characterize the composite fuels, respectively. The result shows that the addition of zirconium leads to the formation of a special structure inside the powder, promoting the oxidation of ZrAl 3 /Al composite fuels. Besides, non-selective oxidation of ZrAl 3 played an important role in promoting the oxidation process. The oxygen bomb experiment was conducted to evaluate the combustion performance of ZrAl 3 /Al composite fuels. Oxygen bomb experiments show that the gravimetric combustion enthalpy of the composite fuels decreases linearly with the increase of zirconium content, and increases with the increase of oxygen partial pressure. However, the volumetric combustion enthalpy decreases first and then increases with the increase of zirconium content, and shows a general upward trend when the partial pressure of oxygen reaches 2.5 MPa or more. The pressure curve indicates that the Al-53Zr composite fuels have the maximum pressure propagation rate (dP/dt) max (which characterizes the maximum flame propagation rate and higher energy releasing rates) in the prepared series of composite fuels. The study demonstrates a complete combustion of ZrAl 3 /Al composite fuels under high pressure. ZrAl 3 /Al composite fuels could be considered as a very promising energetic additive in the field of new-energetic material.

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Effect of Mo‐Containing Additives on Combustion of Al‐B Fuels

Meng

Cai

2023

Propellants Explo Pyrotec

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In this study, the Al-B-Mo alloy powders with a boron content of 7 wt % and Molybdenum content of 0.5-3 wt % were prepared by the close-coupled gas atomization. The powder morphology, phase composition, oxidation, and exothermic behavior of combustion were characterized. The results show that the addition of Mo effectively improves the energetic properties of the alloy powder, with the mass-burning enthalpy of Al-7B-1Mo reaching 31111 J/g, exceeding the theoretical mass-burning enthalpy of monolithic Al (31000 J/g). Al-7B-1Mo underwent a violent exothermic process at around 1000 °C, and the oxidation weight gain ratio and oxidation efficiency reached 46.16 % and 48.05 % respectively, an increase of 19.75 % and 21.08 % compared to Al-7B. The mesh structure formed by the AlB 2 phase on the particle surface positively promoted the particles' thermal oxidation. Mechanical mixtures of AlB 2 /Mo and AlB 2 /MoO 3 were prepared and the catalytic promotion of the combustion of AlB 2 by Mo and MoO 3 was confirmed by thermal tests of combustion. The mechanism by which Mo/MoO 3 promotes the combustion of AlB 2 was investigated through the phase composition characterization of the composite powder after heat treatment in argon and air atmosphere. It was confirmed that MoO 3 promotes the oxidation and combustion of AlB 2 by supplying oxygen to B in AlB 2 , while Mo is first oxidized to MoO 3 , which then promotes the combustion of AlB 2 .

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The Oxidation Mechanism of Pure Aluminum Powder Particles

Cited by 113 publications

References 22 publications

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Preparation, Microstructure and Thermal Property of ZrAl₃/Al Composite Fuels

Effect of Mo‐Containing Additives on Combustion of Al‐B Fuels

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The Oxidation Mechanism of Pure Aluminum Powder Particles

Cited by 113 publications

References 22 publications

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

Preparation, Microstructure and Thermal Property of ZrAl3/Al Composite Fuels

Effect of Mo‐Containing Additives on Combustion of Al‐B Fuels

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Product

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Preparation, Microstructure and Thermal Property of ZrAl₃/Al Composite Fuels