Reactive Ni–Al-Based Materials: Strength and Combustion Behavior

Seropyan, S. A.; Saikov, I. V.; Андреев, Д. Е.; Saikova, G. R.; Алымов, М. И.

doi:10.3390/met11060949

Cited by 14 publications

(8 citation statements)

References 49 publications

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“…The milled powders were pressed with uniaxial pressure in a steel die into cylindrical samples ( Figure 1 ) with relative densities in the range of 65–70% of the maximum theoretical value. In [ 34 ], experiments with the SWL of Ni–Al powder samples (10 mm in diameter and height) were conducted. The results of the experiments showed that it is possible to initiate an exothermic reaction in the powder sample.…”

Section: Methodsmentioning

confidence: 99%

“…The results of the experiments showed that it is possible to initiate an exothermic reaction in the powder sample. Given this, the size, composition, and properties of the cylindrical samples were taken from [ 34 ]. In addition, two through holes were drilled (2.5 mm and 5 mm in diameter) in the center of both Ni-Al powder cylindrical samples.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis of NiAl Intermetallic Compound under Shock-Wave Extrusion

et al. 2022

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This paper presents the implementation of the first stage of a study on the synthesis of the intermetallic compound in the Ni-Al system under shock-wave extrusion (SWE). A method was developed and experiments involving SWE of the reactive Ni–Al powder mixture were carried out. As a result, it was possible to obtain up to 56 vol.% of the final product and achieve 100% synthesis of NiAl. The results of metallographic analysis indicate that the process of high-velocity collapse of the tube created conditions for the formation of a cumulative flow, which directly affects the phase formation in NiAl. It was shown that the presence of the central hole in the powder sample reduced the effect of the Mach stem on the homogeneity of the NiAl structure. It was also determined that with a central hole with a 5 mm diameter, the effect of the Mach stem could not be observed at all. The goals of further studies are achieving 90–100 vol.% of the final product and reducing the porosity in the final product. Preliminary experimental studies have shown great potential for SWE to produce composite metal–intermetallic materials.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Synthesis of NiAl Intermetallic Compound under Shock-Wave Extrusion

et al. 2022

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“…The specimens were placed in a 20 L reactor [48]. The experiments were conducted in argon and air at atmospheric pressure, as well as in vacuum at 2 × 10 4 Pa. A flat graphite heater was used to create a flat combustion front.…”

Section: Methodsmentioning

confidence: 99%

“…The combustion process was recorded with a video camera (HC-VC770, Panasonic, Osaka, Japan) at a frame rate of 50 fps. The specimens were placed in a 20 L reactor [48]. The experiments were conducted in argon and air at atmospheric pressure, as well as in vacuum at 2 × 10 4 Pa. A flat graphite heater was used to create a flat combustion front.…”

Section: Methodsmentioning

confidence: 99%

Energetic Materials Based on W/PTFE/Al: Thermal and Shock-Wave Initiation of Exothermic Reactions

Saikov

Seropyan

Malakhov

et al. 2021

Metals

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The parameters of combustion synthesis and shock-wave initiation of reactive W/PTFE/Al compacts are investigated. Preliminary thermodynamic calculations showed the possibility of combustion of the W/PTFE/Al system at high adiabatic temperatures (up to 2776 °С) and a large proportion of condensed combustion products. The effect of the Al content (5, 10, 20, and 30 wt%) in the W/PTFE/Al system on the ignition and development of exothermic reactions was determined. Ignition temperatures and combustion rates were measured in argon, air, and rarefied air. A correlation between the gas medium, rate, and temperature of combustion was found. The shock initiation in W/PTFE/Al compacts with different Al content was examined. The extent of reaction in all compacts was studied by X-ray diffraction. The compositions with 10 and 20 wt% Al showed the highest completeness of synthesis after combustion and shock-wave initiation.

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“…Metallic energetic composites can release a large amount of heat under high-speed impact or high temperature conditions to produce severe damage effects, so they have received extensive attention from the military and petroleum industries. − Among them, Al/Ni energetic composites have high specific strength and high energy release capacity in theory and have important potential applications in active fragments and reaction liners. − As a reaction material, Al/Ni energetic composites release energy in the form of heat only under high temperature or high impact load conditions. Therefore, at present, many scholars are looking for the improvement of ignition sensitivity, mainly in the following three ways: (1) using particles to increase the contact area between Al and Ni and shorten the diffusion reaction distance as much as possible, (2) reducing the effect of oxide layer and adsorption layer on the exothermic reaction, and (3) increasing the plastic deformation of the material to increase the internal stress of the material. − Cold spraying is a process that accelerates metal particles to supersonic and then impact on the substrate through mechanical occlusion between severely deformed metal particles , and ballistic feature embedding to achieve additive manufacturing. , This process can not only further increase the contact area between particles and the internal stress of the material through the plastic deformation of the particles but also the high-speed impact of the particles will break the metal oxide film at the interface and make the fresh metal directly contact. − Therefore, Al/Ni energetic composites prepared by cold spraying have a high ignition sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Cu Effect on Energy Release of Al/Ni/Cu Energetic Composites

Wang,

Xiong,

Chang

et al. 2024

J. Phys. Chem. C

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The improvement of mechanical properties and the reduction of the reaction energy release rate can make Al/Ni energetic composites have better penetration as fragment materials. In this paper, the influence mechanism of the addition and content of Cu particles on the mechanical properties and energy release of Al/Ni energetic composites has been studied in detail. The Cu deposited on the Al−Ni interface hinders the direct contact between Al and Ni and the rapid exothermic reaction, which increases the initial reaction temperature of Al/Ni energetic composites from 427 to 516 °C. However, the addition of Cu can significantly improve the plasticity of energetic composites. When the Cu content increased to 20%, the elongation of the composite increased by 29.7%. In the steady-state exothermic reaction process of Al/Ni/Cu energetic composites, Cu will hinder the solid− solid interface reaction between Al and Ni, enhance the sensitivity of the initial reaction, and reduce the rate of the exothermic reaction. In the process of shock-induced chemical reaction (SICR), Cu does not only participate in the exothermic reaction but also the hindrance of Cu particles leads to the decrease of the reaction rate. When the Cu content is 10%, the duration of the shockinduced chemical reaction is extended from 160 to 250 ms. The research on the energy release mechanism of Al/Ni/Cu energetic composites under steady-state heating and high-speed impact will provide an important theoretical basis for the practical application of this material.

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Reactive Ni–Al-Based Materials: Strength and Combustion Behavior

Cited by 14 publications

References 49 publications

Synthesis of NiAl Intermetallic Compound under Shock-Wave Extrusion

Synthesis of NiAl Intermetallic Compound under Shock-Wave Extrusion

Energetic Materials Based on W/PTFE/Al: Thermal and Shock-Wave Initiation of Exothermic Reactions

Mechanism of Cu Effect on Energy Release of Al/Ni/Cu Energetic Composites

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