A comparative study on combustion synthesis of Ta–Si compounds

Yeh, C.L.; Wang, H.J.

doi:10.1016/j.intermet.2007.03.004

Cited by 31 publications

(22 citation statements)

References 35 publications

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“…Here we present an example of a movie of a self-propagating high temperature reaction [38][39][40][41][42][43][44][45] in a stoichiometric mixture of titanium and silicon. In these reactions the material changes from a pressed powder to a ceramic pellet.…”

Section: Radiography Of Self-propagating High Temperature Chemical Rementioning

confidence: 99%

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

et al. 2015

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An application of nuclear physics, a facility for using protons for flash radiography, has been developed at the Los Alamos Neutron Science Center (LANSCE). Protons have proven far superior to high energy x-rays for flash radiography because of their long mean free path, good position resolution, and low scatter background. Although this facility is primarily used for studying very fast phenomena such as high explosive driven experiments, it is finding increasing application to other fields, such as tomography of static objects, phase changes in materials and the dynamics of chemical reactions. The advantages of protons are discussed, data from some recent experiments will be reviewed and concepts for new techniques are introduced.

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Section: Radiography Of Self-propagating High Temperature Chemical Rementioning

confidence: 99%

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

et al. 2015

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“…After ignition, the combustion wave spreaded along a spiral trajectory from top to the bottom of the specimen. This spinning combustion wave is considered as an unstable combustion phenomenon and mainly caused by the lack of sufficient heat flux generated from the reaction to maintain the steady propagation of the planar front 28,29 . We refer it "normal combustion", compared to the explosion combustion; where the propagation velocity of the combustion wave can be up to 1000−4000 m/s 30 .…”

Section: Combustion Characteristicsmentioning

confidence: 99%

“…It is necessary to point out that the combustion synthesis reaction of (Mo 0.6 Ti 0.4 )Si 2 and (Mo 0.5 Ti 0.5 )Si 2 specimens was extinguished without a constant heat supply. The (Mo 0.4 Ti 0.6 ) Si 2 specimen was not ignited at room temperature, even though some auxiliary measures were adopted, such as preheating 23,28 , covering powders between the ignition coil and the green compact 31 . For the formation of compounds, it has been demonstrated empirically that the reaction will not be self−propagating unless the adiabatic temperature is beyond 1800K (T ad ≥1800K) [19][20][21] .…”

Section: Combustion Characteristicsmentioning

confidence: 99%

Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Zhu

Feng

et al. 2015

Mat. Res.

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0.6 )Si 2 were prepared by combustion synthesis. The combustion mode, propagation velocity of combustion wave, combustion temperature and product structure were investigated. Specimens MoSi 2 , (Mo 0.9 Ti 0.1 )Si 2 , (Mo 0.8 Ti 0.2 )Si 2 , (Mo 0.7 Ti 0.3 )Si 2 , underwent spontaneously self−propagating combustion synthesis. However, the (Mo 0.6 Ti 0.4 )Si 2 and (Mo 0.5 Ti 0.5 )Si 2 specimens required a sustainable energy supply to complete the combustion synthesis reaction. There was no combustion synthesis reaction in specimen (Mo 0.4 Ti 0.6 )Si 2 . The combustion wave propagated along a spiral trajectory from top to the bottom of the specimen compacts in a layer by layer mode. The propagation velocity of the combustion wave reduced with the addition of titanium. The X-ray diffraction analysis showed that the Cll b -MoSi 2 and C40-(Mo,Ti)Si 2 type phases were formed during combustion synthesis. The intensity of diffraction peaks of C40-(Mo,Ti)Si 2 phase increased with Ti content.

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“…Preparation of transition metal silicides of the Ti-Si, Zr-Si, Nb-Si, Ta-Si, and Mo-Si binary systems was widely studied by the classical SHS method using elemental powder compacts of their corresponding stoichoimetries [19][20][21][22][23][24]. It should be noted that a preheating temperature of 300 • C was required to establish a planar self-propagating combustion wave for combustion synthesis of NbSi 2 and TaSi 2 [21,22], and 200 • C for the elemental powder compact of Mo:Si = 1:2 [23].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

Yeh

Peng

2016

Metals

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Formation of MoSi 2 -Al 2 O 3 composites with a broad range of the MoSi 2 /Al 2 O 3 ratio was conducted by thermite-based combustion synthesis in the SHS mode. The addition of two thermite mixtures composed of MoO 3 + 2Al and 0.6MoO 3 + 0.6SiO 2 + 2Al into the Mo-Si reaction systems facilitated self-sustaining combustion and contributed to in situ formation of MoSi 2 and Al 2 O 3 . The samples adopting the former thermite reagent were more exothermic and produced composites with MoSi 2 /Al 2 O 3 from 2.0 to 4.5, beyond which combustion failed to proceed. Because of lower exothermicity of the reactions, the final products with MoSi 2 /Al 2 O 3 from 1.2 to 2.5 were fabricated from the SHS process involving the latter thermite mixture. Combustion temperatures of both reaction systems decreased from about 1640 to 1150 • C with increasing MoSi 2 /Al 2 O 3 proportion, which led to a phase transition of MoSi 2 . It was found that the dominant silicide was β-MoSi 2 when the combustion temperature of the synthesis reaction exceeded 1550 • C and shifted to α-MoSi 2 as the combustion temperature fell below 1320 • C. The results of this study showed an energy-efficient fabrication route to tailor the phase and content of MoSi 2 in the MoSi 2 -Al 2 O 3 composite.

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A comparative study on combustion synthesis of Ta–Si compounds

Cited by 31 publications

References 35 publications

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

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