Effect of mechanical activation on thermal explosion in Ni-Al mixtures

Kovalev, D. Yu.; Кочетов, Н. А.; Ponomarev, V. I.; Mukasyan, Alexander S.

doi:10.3103/s106138621002007x

Cited by 29 publications

(8 citation statements)

References 2 publications

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“…Using a TRXRD method it was demonstrated that the Ni–Al system proceeds through a liquid phase unless HEBM is applied, while for mechanically induced structures, liquid phase formation was not detected. This media ignites well below any melting point (≈573 K) and the NiAl phase forms at a very low temperature (≈873 K) . It was further confirmed that there is no liquid phase present during the reaction, which was supported by the extremely low ignition temperature (538 K) observed in their system .…”

Section: The Ni–al Systemmentioning

confidence: 61%

The Solid Flame Phenomenon: A Novel Perspective

Mukasyan¹,

Shuck²,

Pauls³

et al. 2018

Adv Eng Mater

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In this paper, the authors overview previous publications and present novel results related to self-sustained solid-state reactions: the solid flame. Due to recent advances in the fabrication of nano-structured reactive media, this phenomenon, which is first reported fifty years ago, has found a new perspective for a wide variety of exothermic systems. These fundamental findings permit novel routes for synthesis of advanced engineering materials with controlled microstructure, as well as for design of high-energy density systems with tuned parameters for energy release.

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Section: The Ni–al Systemmentioning

confidence: 61%

The Solid Flame Phenomenon: A Novel Perspective

Mukasyan¹,

Shuck²,

Pauls³

et al. 2018

Adv Eng Mater

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“…Additional energy is supplied to it, thus enhancing diffusion activity. According to Kovalev et al [ 50 ], it is the existence of non-equilibrium defects that ensures the implementation of the solid-phase mechanism of combustion of the mechanically activated mixtures. As a result, the temperature at which the reaction began was lower than that experienced during the formation of the non-activated mixture, which was heated at the same rate.…”

Section: Resultsmentioning

confidence: 99%

Phase Formation during the Synthesis of the MAB Phase from Mo-Al-B Mixtures in the Thermal Explosion Mode

Potanin,

Bashkirov,

Kovalev

et al. 2024

Materials

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This work focused on the production of the MoAlB MAB phase through self-propagating, high-temperature synthesis in the thermal explosion mode. The influence of the method of a Mo-Al-B-powder reaction mixture preparation on the combustion temperature, mechanism, and stages of the MAB phase formation in the combustion process was investigated. The combustion temperatures of the mixtures obtained in the rotary ball mill and high-speed planetary ball mill were 1234 and 992 °C, respectively. The formation of intermediate compounds Mo3Al8 and α-MoB in the combustion front, along with MoAlB, was established using the time-resolved X-ray diffraction method. In the case of the mixture prepared in a ball mill, the primary interaction in the combustion front occurred through the Al melt, and in the case of using a planetary mill, solid-phase reactions played an important role. The mechanical activation of the mixture in a planetary mill also accelerated the processes of phase formation. The method of a reaction mixture preparation has virtually no effect on the MoAlB MAB phase content in combustion products (92–94%), but it does affect their structure. The synthesis products have a lamellar structure composed of MAB grains with a thickness of ~0.4 μm and a length of ~2–10 μm.

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“…There have been a wide variety of experiments conducted on SHS systems by a number of different groups. For intermetallic systems, groups have studied the Ni-Al [9,[110][111][112][113][114][115][116], Fe-Al [111,[117][118][119][120][121], Nb-Al [122][123][124], and numerous other systems [110,[125][126][127]. Additionally, many groups have examined other SHS based systems, such as carbides, including Ti-C [110,128,129], Ta-C [129,130], and other carbides and cermets [129,[131][132][133][134], nitrides [135,136], oxides [137][138][139], silicides, including Fe-Si [140,141], Mo-Si [119,123,142,143] and Ti-Si [144,145], among a variety of other systems [113,…”

Section: Modern In Situ High-speed High-resolution Methodsmentioning

confidence: 99%

Kinetics of Heterogeneous Self-Propagating High-Temperature Reactions

Shuck¹,

Mukasyan²

2018

Advanced Chemical Kinetics

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In this chapter, we present an overview of experimental techniques utilized and kinetic data collected for exothermic self-sustained noncatalytic heterogeneous reactions. The data focuses on five primary experimental techniques: electrothermal explosion, differential thermal analysis, electrothermography, combustion velocity/temperature analyses, and several advanced in situ diagnostics, including time-resolved X-ray diffraction.

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Effect of mechanical activation on thermal explosion in Ni-Al mixtures

Cited by 29 publications

References 2 publications

The Solid Flame Phenomenon: A Novel Perspective

The Solid Flame Phenomenon: A Novel Perspective

Phase Formation during the Synthesis of the MAB Phase from Mo-Al-B Mixtures in the Thermal Explosion Mode

Kinetics of Heterogeneous Self-Propagating High-Temperature Reactions

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