High Temperature Oxidation of the Al3Mg2 Complex Metallic Alloy

Noirfontaine, Marie‐Noëlle de; Baldinozzi, Gianguido; Barthés-Labrousse, M.-G.; Kusiński, J.; Boëmare, G.; Herinx, M.; Feuerbacher, M.

doi:10.1007/s11085-009-9176-8

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…Decomposition and Oxidation of Magnesium Diboride the reactants can be very fast. 18 The succession of linear portions and sudden increase in the oxidation rate observed in our experiments indicate that the oxide layer which is formed on the surface is never protective in our oxidation conditions. It is inferred that the polycrystalline MgO and t-Mg 2 B 2 O 5 layer provide preferential diffusion paths along the oxides grain boundaries.…”

Section: February 2012mentioning

confidence: 63%

“…) shows that the weight gain rate is nearly to be constant for the first two oxidation stages. Linear growth rates are usually ascribed to the formation of non protective layers, in which the diffusion of the reactants can be very fast . The succession of linear portions and sudden increase in the oxidation rate observed in our experiments indicate that the oxide layer which is formed on the surface is never protective in our oxidation conditions.…”

Section: Resultsmentioning

confidence: 99%

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Decomposition and Oxidation of Magnesium Diboride

et al. 2011

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The decomposition and oxidation behavior of magnesium diboride (MgB2) have been studied using thermogravimetry (TG), XRD and SEM‐EDS. The reactions were carried out by heating MgB2 powder in a stream of argon or air at atmospheric pressure. In the temperature range explored (298–1673 K), four successive steps were observed in the decomposition process of MgB2. The rate‐limiting steps of the decomposition process were found to be associated with the nucleation or formation of boron‐rich phases. The oxidation process of MgB2 comprised five successive phases in the temperature range explored (298–1673 K). There was close relationship between the decomposition and oxidation behavior of MgB2. Experimental results showed that the decomposition reactions occurred during the oxidation process. The acceleration shown in the weight gain curve can be ascribed to the rapid oxidation of Mg vapor released from the decomposition reactions. The microstructure and composition of the oxide scale formed in the oxidation process were investigated using XRD and SEM‐EDS. The oxide layer structure was identified based on the experimental results in this study.

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Section: February 2012mentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Decomposition and Oxidation of Magnesium Diboride

et al. 2011

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“…In Ref. [14], oxidation of an Al3Mg2 alloy was considered. The reaction was observed to proceed 2 in three stages with three distinct rates: an MgO layer was reported to form initially; then MgAl2O4 oxide was produced, which finally cracked, leading to the third oxidation stage.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of differently prepared Al-Mg alloy powders in oxygen

Nie

Schoenitz

Dreizin

2016

Journal of Alloys and Compounds

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Powders of both commercial atomized spherical Al-Mg alloy and mechanically alloyed Al-Mg were oxidized in oxygen using thermo-gravimetry (TG). For both powders, the Al/Mg mass ratio was equal to 1. Fully and partially reacted powders were recovered and characterized using scanning electron microscopy and x-ray diffraction. Voids grow within oxidized alloy particles for both atomized and mechanically alloyed powders. Results were interpreted accounting for the measured particle size distribution for the spherical powder and distributing the TG-measured weight gain among the individual particle size bins. The reaction interfaces were always located at the internal surface of the oxide shell as determined by matching the oxidation dynamics for particles with the same sizes but belonging to powders with different particle size distributions. Thus, the reaction is always rate limited by inward diffusion of oxygen ions through the growing oxide shell. Two oxidation stages were identified for both materials. Both Al and Mg oxidize during both observed oxidation stages. The second oxidation stage is caused by formation of the spinel phase, most likely occurring at a threshold temperature. In the present measurements, the step in the oxidation rate, or switch between the oxidation stages, occurs when the oxide shell grows above a certain thickness of approximately 1.5 µm. The apparent activation energy during the first oxidation stage energy changes during the first oxidation stage suggesting that more than one reaction occur in parallel, e.g., causing formation of MgO and amorphous alumina. For the second oxidation step, controlled by diffusion of oxygen through spinel layer, the activation energy remains nearly constant around 185 kJ/mol.

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“…Many studies have demonstrated the feasibility of Al-based alloys to improve combustion performance compared to pure Al powders, with the majority of studies concentrating on Al-Mg, Al-W, or Al-Li [26][27][28][29][30][31][32][33][34][35]. To obtain the ignition characteristics of alloy particles, Corcoran et al [36] studied single particles of the Al-Mg alloy (1-50 µm, Mg:10-53% mol) in high-temperature mixed acetylene/airflow.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Thermal Oxidation and Laser Ignition Properties of Al-Mg-Li Powders

Lu,

Ma,

Guo

et al. 2023

Materials

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Powder ramjets are a kind of vehicle propulsion system with high specific impulse and efficiency. They provide significant benefits in terms of extended propulsion and thrust adjustment. The pursuit of a highly reactive fuel appropriate for powder ramjets is likely to stimulate advancements in innovative propulsion systems, which are crucial for deep space exploration and long-term space missions. This work presents experimental studies on the thermal oxidation and laser ignition performance of aluminum–magnesium–lithium powders at atmospheric pressure. TG-DSC curves of powders in three heating rates were obtained. The ignition processes and ignition delay times were recorded by a CO2 laser ignition experiment system at a laser power of 10~60 W. The results show that at a lower heating rate of 10 K/min, the powder’s thermal hysteresis is less, and the powder energy released in stage I is more concentrated. However, the degree of heat release concentration approached a similar level at heating rates of 30 K and 50 K. The ignition delay time decreased as the laser flux density increased. When the laser flux density exceeds 80 W/cm2, the effect of laser power on the ignition delay time decreases. At atmospheric pressure, the mathematical relationship between ignition delay time and laser flux density is given. Finally, the powder ignition processes at different laser powers are represented graphically.

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High Temperature Oxidation of the Al3Mg2 Complex Metallic Alloy

Cited by 12 publications

References 32 publications

Decomposition and Oxidation of Magnesium Diboride

Decomposition and Oxidation of Magnesium Diboride

Oxidation of differently prepared Al-Mg alloy powders in oxygen

Experimental Studies on Thermal Oxidation and Laser Ignition Properties of Al-Mg-Li Powders

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