Combustion synthesis in nanostructured reactive systems

Mukasyan, Alexander S.; Рогачев, А. С.; Aruna, S.T.

doi:10.1016/j.apt.2015.03.013

Cited by 106 publications

(48 citation statements)

References 132 publications

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“…Mechanical activation with high energy ball milling was reported to enhance reactivity of reactive nanomaterials [10]. In contrast to the wet mixed composites, ignition experiments with mechanically activated samples were successful.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Self-propagating reactive Al/Ni nanocomposites for bonding applications

Kremer

Roshanghias

Tortschanoff

2017

Micro and Nano Syst Lett

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Highly reactive integrated material systems have recently gained attention, as they promise a feasible tool for heterogeneous integration of micro electromechanical systems. As integrated energy sources they can be used to join heterogeneous materials without applying too much thermal stress to the whole device. An alternative approach is proposed, comprising a single layer of a reactive nanocomposite made of intermixed metal nanoparticles, instead of multilayer systems. In this study the development of the reactive nanocomposite from choice of materials through processing steps, handling and application methods are described. Eventually the results of the experiments upon the reactivity of the nanocomposites and the feasibility for bonding applications are presented. Analysis of the composites was performed by phase-analysis using x-ray diffraction and reaction propagation analysis by high-speed imaging. Composition of products was found to vary with initial particle sizes. Beside of other phases, the dominant phase was intermetallic NiAl.

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Section: Experiments and Resultsmentioning

confidence: 99%

Self-propagating reactive Al/Ni nanocomposites for bonding applications

Kremer

Roshanghias

Tortschanoff

2017

Micro and Nano Syst Lett

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“…Exothermic formation reactions that generate intermetallic compounds and heat have been studied extensively [1][2][3][4][5][6][7][8] and can occur in compacts of homogeneous [1][2][3][4][5][6][7][8], composite [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] or core shell particles [29][30][31], or in layered films [32][33][34][35][36][37][38][39][40] or foils [41][42][43]…”

Section: Introductionmentioning

confidence: 99%

Properties of reactive Al:Ni compacts fabricated by radial forging of elemental and alloy powders

Gibbins

Stover

Krywopusk

et al. 2015

Combustion and Flame

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a b s t r a c tWe explore rotary swaging of powders into solid compacts as an inexpensive means of producing reactive materials with refined microstructures and improved properties. Rotary swaging is a cold forging process that reduces the diameter of tubes, and in this study the tubes are packed with reactive combinations of elemental and alloy powders. The diameter reductions create a nearly fully dense compact from the powders and also reduce the average reactant spacing through plastic deformation. The extent of diameter reduction controls the microstructural refinement, observed through cross-sectional imaging. We correlate the observed changes in microstructure with reaction properties that are characterized using differential scanning calorimetry (DSC), hot-plate ignition studies, and velocity measurements. Exothermic peaks in DSC scans all shift to lower onset temperatures; hot plate ignition temperatures decrease; and reaction velocities rise as the degree of swaging is increased. We vary the shape of the initial reactants by substituting Ni flakes for Ni powders and find no improvement in microstructure or reaction properties, due to clumping of the Ni flakes during the initial compaction steps. We also vary chemistry by substituting Al-Mg alloy powders for Al powders and find that the alloy powders yield lower DSC exothermic peak temperatures, lower ignition temperatures, and higher reaction velocities compared to similar compacts with pure Al powders. This combination of results suggests that rotary swaging is an effective technique for producing reactive materials at low cost.

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“…Previous studies [15,25,29] proposed that the T ad must be more than 1800 K to yield SHS mode in a compact.…”

Section: Resultsmentioning

confidence: 99%

“…Energy and time saving are the main properties of combustion synthesis which makes it become a considerable method to synthesize In-situ composite [1,[23][24][25][26]. The effect of many different parameters like heating rate, green density, etc.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Mehrizi¹

2020

Preprint

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The aim of this study was the synthesis of a homogenous distributed NiAl/TiC composite by combustion synthesis of elemental powders. The effect of the mechanical activation process was evaluated. The phase characterization and evaluation of the microstructure during milling and combustion synthesis were carried on by XRD and SEM-EDS and TEM-EDS, respectively. The XRD result of as-mixed powder compact after combustion synthesis showed that in addition to TiC0.75 and NiAl, some undesired phases like Ni3Al and Ni2Al3 formed. While after combustion synthesis of 3h mechanically activated powder compact, only AlNi and TiC formed. The microstructural evaluations by SEM-EDS and TEM-EDS analysis confirmed the synthesis of truly homogenized NiAl/TiC composite. The mechanism of NiAl/TiC formation consists of dissolution of nickel, titanium, and graphite in molten aluminum and precipitation of TiC primarily and then the formation of NiAl. The value of microhardness of synthesized NiAl/TiC was 1070±12 HV. The main reason for this result is a uniform distribution of spherical TiC reinforcement in the NiAl matrix. Therefore, the mechanical activation process facilitated the reactions and improved the mechanical properties of the final composite.

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Combustion synthesis in nanostructured reactive systems

Cited by 106 publications

References 132 publications

Self-propagating reactive Al/Ni nanocomposites for bonding applications

Self-propagating reactive Al/Ni nanocomposites for bonding applications

Properties of reactive Al:Ni compacts fabricated by radial forging of elemental and alloy powders

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

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