Combustion synthesis of MoSi2 and MoSi2–Mo5Si3 composites

Yeh, C.L.; Chen, W.H.

doi:10.1016/j.jallcom.2006.08.033

Cited by 47 publications

(25 citation statements)

References 22 publications

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“…The combustion temperature obtained for the Moþ 3Si system approached 1350 1C even though the powder compact was preheated to a temperature of 300 1C. Yeh and Chen [21] studied the effect of the reactant ratio and preheating temperature on the propagation mode of the reaction front, combustion temperature, and combustion rate for the combustion synthesis of molybdenum disilicide and molybdenum disilicidemolybdenum trisilicide composites. They evaluated six different reactant ratio such as Si/Mo¼ 0.83, 1.0, 1.22, 1.33, 1.5, and 2.0, and reported self-sustaining spinning combustion was observed for the atomic ratio of silicon to molybdenum of 0.83, 1.0, and 1.22.…”

Section: Resultsmentioning

confidence: 99%

Combustion characteristics of molybdenum–silicon mixtures

Yeo

Jeon

Lee

et al. 2015

Ceramics International

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Section: Resultsmentioning

confidence: 99%

Combustion characteristics of molybdenum–silicon mixtures

Yeo

Jeon

Lee

et al. 2015

Ceramics International

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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%

“…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]. When combined with thermite reactions using Al as the reducing agent, combustion synthesis represents an in situ approach to preparing intermetallic and ceramic composites reinforced by Al 2 O 3 [25].…”

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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“…By means of the classical SHS approach, many silicide phases in the Mo-Si, Ti-Si, Zr-Si, and Nb-Si systems were prepared from the reactant compacts made up of stoichiometric elemental powders [9][10][11][12]. In addition, formation of the silicides in the V-Si and Ta-Si systems was carried out by a modified SHS technique known as field-activated combustion synthesis (FACS) that applied an electric field perpendicularly to the propagation direction of the combustion wave [13,14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Self-Propagating High-Temperature Synthesis of Ta5Si3 Intermetallics

Yeh

Chou

Hwang

2015

Metals

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Formation of Ta5Si3 by self-propagating high-temperature synthesis (SHS) from elemental powder compacts of Ta:Si = 5:3 was experimentally and numerically studied. Experimental evidence showed that the increase of either sample density or preheating temperature led to the increase of combustion wave velocity and reaction temperature. The apparent activation energy, Ea ≈ 108 kJ/mol, was determined for the synthesis reaction. Based upon numerical simulation, the Arrhenius factor of the rate function, K0 = 2.5 × 10 7 s −1 , was obtained for the 5Ta + 3Si combustion system. In addition, the influence of sample density on combustion wave kinetics was correlated with the effective thermal conductivity (keff) of the powder compact. By adopting 0.005 ≤ keff/kbulk ≤ 0.016 in the computation model, the calculated combustion velocity and temperature were in good agreement with experimental data of the samples with compaction densities between 35% and 45% theoretical maximum density (TMD).

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Combustion synthesis of MoSi2 and MoSi2–Mo5Si3 composites

Cited by 47 publications

References 22 publications

Combustion characteristics of molybdenum–silicon mixtures

Combustion characteristics of molybdenum–silicon mixtures

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

Experimental and Numerical Studies on Self-Propagating High-Temperature Synthesis of Ta5Si3 Intermetallics

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