Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys

Title
Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys
Authors
김진상원성옥김동익백승협김성근이병현신준철임상순정성진김병규박형호
Keywords
Thermoelectrics; Bi2Te3 alloys; Hot extrusion; Spark plasma sintering
Issue Date
2020-07
Publisher
Journal of the European Ceramic Society
Citation
VOL 40-3048
Abstract
Hot extrusion is a promising method for producing high-performance thermoelectric bismuth telluride alloys because of its ability to create textured microstructures. However, hot extrusion is less favourable for scaling-up because of temperature and strain gradients along the radial direction, and only <110> -textured thermoelectric legs can be obtained because of the fibre-like texture. We suggest a way to overcome these disadvantages by implementing an additional spark plasma sintering process on a stack of extrudates. Using this combined process, we demonstrate the fabrication of 12 × 15 × 13 mm3 p-type (Bi0.2Sb0.8)2Te3 samples from extrudates that had originally been 3 mm in diameter. The evolution of sheet-like texture revealed by SEM, XRD, and EBSD allows us to obtain both <110> - and <001> -textured thermoelectric legs from a single specimen that are desirable for low- and high-temperature applications, respectively. Our results demonstrate the combined method as an industry-friendly process for fabricating high-performance thermoelectric materials.
URI
http://pubs.kist.re.kr/handle/201004/71259
ISSN
0955-2219
Appears in Collections:
KIST Publication > Article
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