Interaction of super-finely dispersed Al powders with water

Lyashko, A. P.; Medvinskii, A. A.; Saveliev, G. G.; Iliin, A. P.; Yavorovskii, N. A.

doi:10.1007/bf02061723

Cited by 10 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, such a trend in the searched for correlation was not identified, probably because of differences in powder properties [60] and propellant preparation procedures.…”

Section: Discussionmentioning

confidence: 97%

Nanoaluminium: is there any Relationship between Powder Particles’ Size, Non-Isothermal Oxidation Data and Ballistics?

Gromov¹,

Teipel²

2017

Cent. Eur. J. Energ. Mater.

View full text Add to dashboard Cite

This article focuses on data analyses and comparisons for aluminium nanopowders (or nanoaluminium, nAl) reactions under slow (0.5-20.0 K/min, using DTA/DSC/TGA) and fast (>10000 K/min, combustion in solid propellant formulations) non-isothermal oxidation. Particle sizes were defined through the BET method. Active Al content was related with the averaged reactivity parameters, taken from published DTA/DSC/TGA data. The specific oxidation onset temperature for nAl was poorly correlated with the BET particle size under the conditions investigated. Furthermore, the BET particle size exhibited no correlation with the observed ballistic response (burning rate) at 3.0 MPa. A logarithmic correlation y = 17.484 ln(x) -5813, with R² = 0.73, was found between nAl particle size and its aluminium content. A calibration equation for the oxidation onset temperature as a function of nAl particle size was determined as y = −0.0071x 2 + 3.3173x + 479.32, with R² = 0.75. Specific features of the nAl (metallic aluminum content in nAl and the oxidation onset temperature) can be predicted based on the measured powder parameters (such as BET particle size).

show abstract

“…In general, such a trend in the searched for correlation was not identified, probably because of differences in powder properties [60] and propellant preparation procedures.…”

Section: Discussionmentioning

confidence: 97%

Nanoaluminium: is there any Relationship between Powder Particles’ Size, Non-Isothermal Oxidation Data and Ballistics?

Gromov¹,

Teipel²

2017

Cent. Eur. J. Energ. Mater.

View full text Add to dashboard Cite

show abstract

“…It can be seen that, as the specific surface area increases twofold, the maximum rate of interaction with water shows also an approximately twofold increase. Figure 6 presents also the literature data on the rate of oxidation by water for aluminum powders prepared by the methods of electric explosion of wires and plasma sputtering [8]. The surprising thing is that the points obtained at different temperatures fitted line 2.…”

Section: Temperature Dependence Of Reaction Ratementioning

confidence: 94%

“…(1, 2) Mechanochemically activated aluminum; (3, 4) UDA; (5) initial PAP-2 aluminum; (6, 7) samples of finely dispersed aluminum prepared by the electric explosion of wire and in plasma, respectively[8] (1). Oxidation rate at the initial part, A/τ, and (2-7) the maximum rate of oxidation, W max .…”

mentioning

confidence: 99%

Mechanochemical Activation of Aluminum: 3. Kinetics of Interaction between Aluminum and Water

et al. 2005

View full text Add to dashboard Cite

Two regimes of oxidation by water are revealed for nanocrystalline aluminum prepared by the mechanical activation of its mixture with graphite and distributed in the matrix of amorphous carbon. At the temperatures 50 ° C < T < 90 ° C, nanosized aluminum particles interact with water under quasi-isothermal conditions. The main products are hydrogen and pseudoboehmite AlOOH; a low content of bayerite Al(OH) 3 is also formed. After the induction period, the kinetics of interaction can be satisfactorily described by the law of a diminishing sphere. The effective activation energy of the reaction is equal to 61 ± 10 kJ/mol and is identical for the samples of submicron aluminum prepared by different procedures. At temperatures above 90-95 ° C, the oxidation of mechanically activated aluminum by water is transformed into a thermally self-accelerated explosion process. Under these conditions, the oxidation of aluminum to α -Al 2 O 3 is accompanied by an exothermal reaction between the metal and the carbon matrix during which aluminum carbide Al 4 C 3 is formed.

show abstract

“…Among widely-used methods of activation are electric explosion of thin wires [1], vacuum condensation of vapors [2], plasma spraying [3], decomposition of aluminum hydride AlH 3 [4], and mechanical treatment of powders [5].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical activation of aluminum: 1. Joint grinding of aluminum and graphite

et al. 2004

View full text Add to dashboard Cite

Changes in the crystal structure and composition of aluminum and graphite powder mixtures in the course of their joint mechanical treatment in a vibration mill were monitored by the adsorption and X-ray diffraction techniques. It was shown that, at absorbed energy doses of 8-10 kJ/g, the grinding and mixing of aluminum with graphite is completed by the formation of an intermediate structure of Al/C composite, where aluminum showed an anomalously high reactivity. The interaction of aluminum with water was used to study its reactivity in the composite. The formation of the composite preceded the stage of chemical interaction between carbon and aluminum atoms.

show abstract

Interaction of super-finely dispersed Al powders with water

Cited by 10 publications

References 0 publications

Nanoaluminium: is there any Relationship between Powder Particles’ Size, Non-Isothermal Oxidation Data and Ballistics?

Nanoaluminium: is there any Relationship between Powder Particles’ Size, Non-Isothermal Oxidation Data and Ballistics?

Mechanochemical Activation of Aluminum: 3. Kinetics of Interaction between Aluminum and Water

Mechanochemical activation of aluminum: 1. Joint grinding of aluminum and graphite

Contact Info

Product

Resources

About