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Electric Field Enhanced Synthesis of Nanostructured Tantalum Carbide

Published online by Cambridge University Press:  31 January 2011

Olivia A. Graeve  and
Zuhair A. Munir
Olivia A. Graeve
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
Zuhair A. Munir*
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616
*
a)Address all correspondence to this author.
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Abstract

Nanocrystalline TaC was synthesized by the field-activated combustion method. The crystallite size ranged from about 30 to 55 nm, depending on the applied field. At low fields (8.54 ≤ E < 16.39 V cm−1) the average crystallite size was relatively unaffected by the field, but it showed a significant increase at fields higher than 16.39 V cm−1. From temperature measurements, this field was found to coincide with the melting of Ta. The combustion wave velocity likewise showed a significant increase when the temperature was at the melting point. The composition of the product showed a dependence on the magnitude of the applied field. At low field values (above a threshold) the product contained Ta2C. When synthesized at high fields, the product showed the presence of TaC phase only. The lattice parameter and the C/Ta ratio showed a slight dependence on the field, both increasing with an increase in the magnitude of the field.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 609 - 613
Copyright
Copyright © Materials Research Society 2002

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