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Simultaneous Synthesis and Consolidation of Nanostructured MoSi2

Published online by Cambridge University Press:  31 January 2011

Christophe Gras ,
Frédéric Bernard ,
Frédéric Charlot ,
Eric Gaffet  and
Zuhair A. Munir
Christophe Gras
Affiliation:
LRRS, UMR 5613 CNRS, University of Burgundy, “Fine Grained Materials” Group, BP47870, F-21078 Dijon, France and UMR 5060 CNRS, “Nanomaterials: Far From Equilibrium Phase Transitions” Group, F-90010 Belfort, France
Frédéric Bernard
Affiliation:
LRRS, UMR 5613 CNRS, University of Burgundy, “Fine Grained Materials” Group, BP47870, F-21078 Dijon, France
Frédéric Charlot
Affiliation:
LRRS, UMR 5613 CNRS, University of Burgundy, “Fine Grained Materials” Group, BP47870, F-21078 Dijon, France and UMR 5060 CNRS, “Nanomaterials: Far From Equilibrium Phase Transitions” Group, F-90010 Belfort, France
Eric Gaffet
Affiliation:
UMR 5060 CNRS, “Nanomaterials: Far From Equilibrium Phase Transitions” Group, F-90010 Belfort, France
Zuhair A. Munir
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
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Abstract

A new process combining electric field activation and the imposition of pressure from mechanically activated powder mixtures is demonstrated as a means to simultaneously synthesize and densify nano-MoSi2 in one step. Nanophase reactants (Mo + 2Si) produced by mechanical activation are reacted by field activation with the simultaneous application of a uniaxial pressure. Mo + 2Si powders were comilled in a specially designed planetary mill to obtain nanometric reactants but to avoid formation of any product phases. These were then subjected to high alternating currents (1600 A) and pressures of 106 MPa. Under these conditions, a reaction is initiated and completed within a short period of time (3–6 min). The relative density of the product ranged from 82 to 93%. The crystallite size of the MoSi2 compound was determined by x-ray diffraction line-broadening analysis using the Langford method. The size ranged from 58 to 75 nm.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 542 - 549
Copyright
Copyright © Materials Research Society 2002

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