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Metals 2016, 6(10), 235; doi:10.3390/met6100235

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

Department of Aerospace and Systems Engineering, Feng Chia University, Taichung 40724, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Khaled Morsi
Received: 15 July 2016 / Revised: 21 September 2016 / Accepted: 28 September 2016 / Published: 30 September 2016
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Abstract

Formation of MoSi2–Al2O3 composites with a broad range of the MoSi2/Al2O3 ratio was conducted by thermite-based combustion synthesis in the SHS mode. The addition of two thermite mixtures composed of MoO3 + 2Al and 0.6MoO3 + 0.6SiO2 + 2Al into the Mo–Si reaction systems facilitated self-sustaining combustion and contributed to in situ formation of MoSi2 and Al2O3. The samples adopting the former thermite reagent were more exothermic and produced composites with MoSi2/Al2O3 from 2.0 to 4.5, beyond which combustion failed to proceed. Because of lower exothermicity of the reactions, the final products with MoSi2/Al2O3 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 MoSi2/Al2O3 proportion, which led to a phase transition of MoSi2. It was found that the dominant silicide was β-MoSi2 when the combustion temperature of the synthesis reaction exceeded 1550 °C and shifted to α-MoSi2 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 MoSi2 in the MoSi2–Al2O3 composite. View Full-Text
Keywords: self-propagating high-temperature synthesis (SHS); thermite reaction; MoSi2; Al2O3; combustion temperature self-propagating high-temperature synthesis (SHS); thermite reaction; MoSi2; Al2O3; combustion temperature
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MDPI and ACS Style

Yeh, C.-L.; Peng, J.-A. Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents. Metals 2016, 6, 235.

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