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Proceedings Paper

Shockwave consolidation of nanostructured thermoelectric materials
Author(s): Narasimha S. Prasad; Patrick Taylor; David Nemir
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Paper Abstract

Nanotechnology based thermoelectric materials are considered attractive for developing highly efficient thermoelectric devices. Nano-structured thermoelectric materials are predicted to offer higher ZT over bulk materials by reducing thermal conductivity and increasing electrical conductivity. Consolidation of nano-structured powders into dense materials without losing nanostructure is essential towards practical device development. Using the gas atomization process, amorphous nano-structured powders were produced. Shockwave consolidation is accomplished by surrounding the nanopowder-containing tube with explosives and then detonated. The resulting shock wave causes rapid fusing of the powders without the melt and subsequent grain growth. We have been successful in generating consolidated nanostructured bismuth telluride alloy powders by using shockwave technique. Using these consolidated materials, several types of thermoelectric power generator devices have been developed. Shockwave consolidation is anticipated to generate large quantities of nanostructred materials expeditiously and cost effectively. In this paper, the technique of shockwave consolidation will be presented followed by Seebeck Coefficient and thermal conductivity measurements of consolidated materials. Preliminary results indicate a substantial increase in electrical conductivity due to shockwave consolidation technique.

Paper Details

Date Published: 17 October 2014
PDF: 8 pages
Proc. SPIE 9226, Nanophotonics and Macrophotonics for Space Environments VIII, 92260J (17 October 2014); doi: 10.1117/12.2063852
Show Author Affiliations
Narasimha S. Prasad, NASA Langley Research Ctr. (United States)
Patrick Taylor, U.S. Army Research Lab. (United States)
David Nemir, TXL Group, Inc. (United States)

Published in SPIE Proceedings Vol. 9226:
Nanophotonics and Macrophotonics for Space Environments VIII
Edward W. Taylor; David A. Cardimona, Editor(s)

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