Effect of polymorphic phase transformations in alumina layer on ignition of aluminium particles

Trunov, Mikhaylo; Schoenitz, Mirko; Dreizin, Edward L.

doi:10.1080/13647830600578506

Cited by 295 publications

(223 citation statements)

References 26 publications

Supporting

Mentioning

207

Contrasting

Order By: Relevance

“…For aluminum nanoparticle, it is believed that the sequent phase transition of the formed oxide layer from amorphous-alumina as the temperature increases, and the melting of the aluminum core promote the staged oxidation [18,20]. The exothermic path of nano-AlCu is similar to that of the nAl.…”

Section: Example Of Low Heating Ratementioning

confidence: 67%

“…The temperature gradient (dT/dt) during the experiment remained constant but for a very short interval of time, it becomes higher than its set value. This run away of temperature is regarded as the ignition reaction [20,21]. Such an ignition would not cause a global combustion event of the sample, however it accelerates the following oxidation process.…”

Section: Example Of High Heating Ratementioning

confidence: 99%

See 1 more Smart Citation

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

View full text Add to dashboard Cite

Nano-structured energetic materials have been recently proposed as novel energy storage media where the exothermic reaction is the key to control the heat release process. The properties of nanoalloys, which can be engineered not only by the particle size, but also by varying their elemental compositions, are very appealing. This work conducts a comparative experimental study of the exothermic characteristics of two nanomaterials in the air, aluminum nanoparticles (nAl) and aluminum-copper nanoalloys (nano-AlCu) based on TGA/DSC studies. The results show that the general exothermic characteristics of nano-AlCu are very similar to that of nAl but the nano alloy is more reactive. The nano-AlCu oxides and ignites at lower temperature, and influenced by the heating rate. An early ignition is found for both nanomaterials, and melting of the nano-alloy is believed to be responsible for its early ignition.

show abstract

Section: Example Of Low Heating Ratementioning

confidence: 67%

Section: Example Of High Heating Ratementioning

confidence: 99%

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Various explanations for Al oxidation mechanisms have also been proposed, each strongly tied to the ignition mechanism and heating rate [3]- [11]. All theories share a common theme for mass transport of fuel and oxidizer, but differ in how that diffusion is achieved (i.e., via (a) dispersion [3], [4], (b) phase changes in the polymorphous passivation shell [5]- [7] , (c) reactive sintering [8], (d) pressure gradient driven processes [9], [10], and (e) induced electric field influences [11]). This article will not directly deal with any particular reaction mechanism, but rather investigate the influence of a new parameter, mechanical strain, which has only recently been considered in the study of Al oxidation [3], [4], [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Improving aluminum particle reactivity by annealing and quenching treatments: Synchrotron X-ray diffraction analysis of strain

2016

View full text Add to dashboard Cite

In bulk material processing, annealing and quenching metals such as aluminum (Al) can relieve residual stress and improve mechanical properties. On a single particle level, affecting mechanical properties may also affect Al particle reactivity. This study examines the effect of annealing and quenching on the strain of Al particles and the corresponding reactivity of aluminum and copper oxide (CuO) composites. Micron-sized Al particles were annealed and quenched according to treatments designed to affect Al mechanical properties. Synchrotron X-ray diffraction (XRD) analysis of the particles reveals the thermal treatment increased the dilatational strain of the aluminum-core, alumina-shell particles. Flame propagation experiments also show thermal treatments effect reactivity when combined with CuO. An effective annealing/quenching treatment for increasing aluminum reactivity was identified. These results show that altering the mechanical properties of Al particles affects their reactivity. This manuscript focuses on synchrotron x-ray diffraction analysis of aluminum particles that have been treated to improve their mechanical properties. The aluminum is then examined for its reactivity with a metal oxide to show the relationship between material processing and the mechanical properties of the metal then extend this understanding towards application for energy generation technologies. We felt this combination of in-depth analysis of the material property of strain based on annealing and quenching processing of a metal powder and its application to reactivity were the perfect combination of mechanical and functional behavior appropriate for Acta Materialia. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 AbstractIn bulk material processing, annealing and quenching metals such as aluminum (Al) can relieve residual stress and improve mechanical properties. On a single particle level, affecting mechanical properties may also affect Al particle reactivity. This study examines the effect of annealing and quenching on the strain of Al particles and the corresponding reactivity of aluminum and copper oxide (CuO) composites. Micron-sized Al particles were annealed and quenched according to treatments designed to affect Al mechanical properties. Synchrotron Xray diffraction (XRD) analysis of the particles reveals the thermal treatment increased the dilatational strain of the aluminum-core, alumina-shell particles. Flame propagation experiments also show thermal treatments effect reactivity when combined with CuO. An effective annealing/quenching treatment for increasing aluminum reactivity was identified. These resultsshow that altering the mechanical properties of Al particles affects their reactivity.

show abstract

“…The modi¦ed dependence has been obtained from equilibrium computations using a more detailed chemical model [7].…”

Section: Thermodynamic and Solid Liquid Transformation Modelsmentioning

confidence: 99%

“…These studies provided data on the §ame speed, combustion temperature, and particle burning time. Several combustion models have been proposed for the particle oxidation in solid phase [7] and for particle §ames [4,5,8]. In spite of this e¨ort, at present, there is no reliable theory on the nanoparticle combustion mechanism as well as on the §ame propagation in a nanoparticle cloud.…”

Section: Introductionmentioning

confidence: 99%

Studies on the burning of micro- and nanoaluminum particle clouds in air

Bocanegra¹,

Sarou‐Kanian²,

Davidenko³

et al. 2009

Progress in Propulsion Physics

View full text Add to dashboard Cite

An experimental study has been conducted to determine §ame propagation velocities in micro-(6 µm) and nanosized (250 nm) aluminum particle clouds for various concentrations in air. The experimental results show faster §ame propagation in nanoparticle cloud with respect to the microparticle §ame. Maximum §ame temperature has been measured using a high-resolution spectrometer operating in the visible range. Analysis of combustion residual shows that nanoparticle combustion is realized via the gaseous phase. A laminar §ame model has been proposed based on this observation. Model parameters have been derived by ¦tting the experimental results.

show abstract

Effect of polymorphic phase transformations in alumina layer on ignition of aluminium particles

Cited by 295 publications

References 26 publications

Exothermic characteristics of aluminum based nanomaterials

Exothermic characteristics of aluminum based nanomaterials

Improving aluminum particle reactivity by annealing and quenching treatments: Synchrotron X-ray diffraction analysis of strain

Studies on the burning of micro- and nanoaluminum particle clouds in air

Contact Info

Product

Resources

About