Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys
- Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys
- 김진상; 원성옥; 김동익; 백승협; 김성근; 이병현; 신준철; 임상순; 정성진; 김병규; 박형호
- Thermoelectrics; Bi2Te3 alloys; Hot extrusion; Spark plasma sintering
- Issue Date
- Journal of the European Ceramic Society
- VOL 40-3048
- 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.
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