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Reaction and phase separation mechanisms during synthesis of alloys by thermite type combustion reactions

Published online by Cambridge University Press:  31 January 2011

Cheryl Lau ,
Alexander S. Mukasyan  and
Arvind Varma
Cheryl Lau
Affiliation:
Department of Chemical Engineering and Center for Molecularly Engineered Materials, University of Notre Dame, Notre Dame, Indiana 46556
Alexander S. Mukasyan
Affiliation:
Department of Chemical Engineering and Center for Molecularly Engineered Materials, University of Notre Dame, Notre Dame, Indiana 46556
Arvind Varma*
Affiliation:
Department of Chemical Engineering and Center for Molecularly Engineered Materials, University of Notre Dame, Notre Dame, Indiana 46556
*
a) Address all correspondence to this author. e-mail: avarma@nd.edu
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Abstract

Combustion of the thermite system is a promising approach for synthesis of alloys (e.g., Co-based) that are widely used in orthopedic applications. This process typically involves formation of two liquids (oxide and metal alloy), followed by their phase separation. The latter is generally believed to be controlled solely by gravity-driven buoyancy. To verify this hypothesis, a fundamental study of phase separation during alloy synthesis was conducted in both normal gravity and microgravity conditions. It was shown that a non-gravity-driven mechanism primarily controls the segregation process. Quenching experiments identified the reaction and phase separation mechanisms in the investigated systems.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 1 , January 2003 , pp. 121 - 128
Copyright
Copyright © Materials Research Society 2003

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