Anomalous decrease in the activation energy and initiation temperature of a thermal explosion in the mechanically activated composition 3Ni + Al

Filimonov, V. Yu.; Корчагин, М. А.; Евстигнеев, В. В.; Lyakhov, N. Z.

doi:10.1134/s1028335809060068

Cited by 10 publications

(2 citation statements)

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“…[2][3][4] An exothermic mixture of nickel and aluminum powders (with 1:1 molar ratio, adiabatic combustion temperature 1910 K) was investigated by several research groups, and it was proved that relatively short-term (minutes) of HEBM results in the enhancement of systems reactivity. [4][5][6] The question is if indeed high energy ball milling leads to the reaction activation? Or in other words, does HEBM decrease the energy barrier for chemical reactions?…”

Section: Introductionmentioning

confidence: 99%

Kinetics of High Temperature Reaction in Ni-Al System: Influence of Mechanical Activation

et al. 2010

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High temperature (>1000 K) reaction kinetics in the stoichiometric (1:1 by molar ratio) Al-Ni system was investigated by using the, so-called, electrothermal analysis (ETA) method. ETA is the only technique that allows studying kinetics of a heterogeneous gasless reaction at temperatures above the melting points of the precursors. Special attention was focused on methodological aspects of the ETA method. Two different reaction systems were studied: (i) initial Al/Ni clad particles; (ii) the same powders but after 15 min of high energy ball milling. Analysis of the obtained results leads to the conclusion that such mechanical treatment decreases the apparent activation energies of the reaction in the Ni-Al system, from 47 +/- 7 kcal/mol for the initial powder to 25 +/- 3 kcal/mol after ball milling. Comparison of these data with those reported previously was also made.

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Section: Introductionmentioning

confidence: 99%

Kinetics of High Temperature Reaction in Ni-Al System: Influence of Mechanical Activation

et al. 2010

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“…During the successive decades, interest in mechanical activation rapidly grew producing several papers on the subject . From a propulsive point of view, mechanical activation is very interesting since it has proven to promote reduction of both initiation temperature and activation energy, thus increasing powder reactivity . Also for MM, a reduction of powder metal content has been observed .…”

Section: Introductionmentioning

confidence: 99%

Ignition of Mechanically Activated Aluminum Powders Doped with Metal Oxides

Dossi

Maggi

2019

Propellants Explo Pyrotec

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Use of mechanical milling to increase micrometric powder reactivity is of interest due to several intrinsic advantages of this technique (e. g. versatility and safety). In this work, 30 μm propulsion‐grade aluminum has been activated with and without metal oxides. The powders so obtained were characterized in terms of particle size distribution, metal content, morphology, and ignition temperature. This last parameter represents a good indicator to rate the reaction properties of powders and the effects of activation parameters on the final product. All the ingredients containing metal oxides feature an enhanced reactivity as a consequence of both additives and modification of particle morphology.

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Development of Polyurethane‐Based Solid Propellants Using Nanocomposite Materials

Ali¹,

El‐Masry

Tawfik³

2015

Propellants Explo Pyrotec

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Mechanically‐activated nanocomposites (MANCs) of nano‐aluminum (nAl)/X (X=Cu, Ni, Zn, Mg, and graphite) were used as replacements for reference nAl powder and as catalytic ingredients in polyurethane (PU) propellants. The effects of their use on combustion heat, burning rate, and thermal decomposition were investigated. It was found that MANCs have catalytic effects and the modified propellants have enhanced the released heat, burning rate, and thermal decomposition properties. MANCs‐based propellants have improved the processing and the mechanical properties with acceptable safety aspects. They can be used for catalytic applications in solid propellants to improve their energetic, burning rate, and thermal decomposition characteristics.

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Anomalous decrease in the activation energy and initiation temperature of a thermal explosion in the mechanically activated composition 3Ni + Al

Cited by 10 publications

References 1 publication

Kinetics of High Temperature Reaction in Ni-Al System: Influence of Mechanical Activation

Kinetics of High Temperature Reaction in Ni-Al System: Influence of Mechanical Activation

Ignition of Mechanically Activated Aluminum Powders Doped with Metal Oxides

Development of Polyurethane‐Based Solid Propellants Using Nanocomposite Materials

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