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Metals 2016, 6(10), 235;

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

Department of Aerospace and Systems Engineering, Feng Chia University, Taichung 40724, Taiwan
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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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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

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