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Formation of silicide/spinel ceramic composites via Al- and Mg-based thermitic combustion synthesis

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Abstract

Formation of MoSi2–spinel (MgAl2O4) composites with a wide composition range of MoSi2/MgAl2O4 = 1.0–5.0 was studied by thermitic combustion synthesis in the mode of self-propagating high-temperature synthesis (SHS). Two combustion systems conducted contained not only Mo and Si powders, but also different thermite reagents of 7/12 MoO3 + Mg + 1/2 Al and MoO3 + 2 Al in the presence of Al2O3 and MgO, respectively. In agreement with the calculated adiabatic reaction temperatures, measured combustion temperature and flame-front velocity decreased with increasing MoSi2/MgAl2O4 ratio. The XRD analysis indicated that MoSi2 was formed in α and/or β phases and that β-MoSi2 dominated as the combustion temperature above 1550 °C but α-MoSi2 prevailed as the temperature below 1350 °C. Spinel MgAl2O4 was produced through the dissolution of thermite-produced Al2O3 and MgO into pre-added MgO and Al2O3, respectively. The fracture surface morphology of the products exhibited that granular MoSi2 particles were distributed over or embedded partially into the dense and connecting substrate formed by MgAl2O4.

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Funding

This research was sponsored by the Ministry of Science and Technology of Taiwan under the grant of MOST 110–2221-E-035–042-MY2.

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Correspondence to Chun-Liang Yeh.

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Yeh, CL., Chen, M.C. & Shieh, T.H. Formation of silicide/spinel ceramic composites via Al- and Mg-based thermitic combustion synthesis. J Aust Ceram Soc 58, 1275–1282 (2022). https://doi.org/10.1007/s41779-022-00738-x

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