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Title: Fabrication of bismuth-telluride thermoelectric wires by friction extrusion

Journal Article · · Materials & Design

Efficient conversion of low-grade heat into electric power is challenging for thermoelectric materials and systems. This is because the high-aspect ratio thermoelectric elements needed for maximum conversion efficiency are difficult and costly to manufacture. In this work, friction extrusion is explored as a new method for fabricating bulk bismuth-telluride (BiTe) wires that can be sectioned into high-aspect ratio thermoelectric elements. Bismuth-telluride feedstock materials in the form of vacuum hot-pressed powder and castings are processed by friction extrusion into meters-long wires having 2.5 mm and 1.0 mm diameters. The novel deformation process gives an average grain size below 5 µm and preferential c-axis texture alignment perpendicular to the extrusion direction. Results for Seebeck coefficient, resistivity, power factor, and weighted mobility show that transport properties exceeding that of high-performance vacuum hot-pressed powders are achieved through friction extrusion of simple castings. The unique deformation conditions at the rotating die/feedstock interface enables a much higher extrusion ratio (161:1) than is possible with conventional extrusion. This is a key enabler for extruding small wire diameters from cast billets.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC05-76RL01830; NA0003525
OSTI ID:
2480395
Report Number(s):
PNNL-SA--202839
Journal Information:
Materials & Design, Journal Name: Materials & Design Vol. 248; ISSN 0264-1275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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