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Micropyretic synthesis of MoSi2 powders through an aluminothermic reaction

Published online by Cambridge University Press:  31 January 2011

Ming Fu ,
S. Penumella  and
J. A. Sekhar
Ming Fu
Affiliation:
Micropyretics Heaters International (MHI), Inc., 613 Redna Terrace, Cincinnati, Ohio 45215
S. Penumella
Affiliation:
Micropyretics Heaters International (MHI), Inc., 613 Redna Terrace, Cincinnati, Ohio 45215
J. A. Sekhar
Affiliation:
International Center for Micropyretics, Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221
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Abstract

An aluminothermic reaction starting with inexpensive MoO3, SiO2, and Al powders was utilized to prepare molybdenum disilicide (MoSi2) powders by the micropyretic/combustion synthesis process and leaching. The combustion-synthesized product was porous and could readily be crushed into powders. X-ray diffraction (XRD) analysis revealed that the product of such a reaction consisted of α–Al2O3, MoSi2, and a small amount of Mo(Si,Al)2 and Mo5Si3. The reason for the formation of Mo(Si, Al)2 phase is discussed. MoSi2 powders were obtained by leaching out the Al2O3 from the synthesized powder mixtures in boiling phosphoric acid solution. The synthesized MoSi2 powders, including a small amount of Mo(Si, Al)2 and Mo5Si3, were very fine with an average particle size of about 1 μm.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 2023 - 2028
Copyright
Copyright © Materials Research Society 1999

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