Combined hot extrusion and spark plasma sintering method for producing highly textured thermoelectric Bi2Te3 alloys |
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| Affiliation: | 1. Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;2. Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea;3. High Temp. Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;4. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;5. Yonsei-KIST Convergence Research Institute, Seoul 02792, Republic of Korea;6. Division of Nano & Information Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Instrumental Analysis Center of Xi’an Jiaotong University, Xi’an Jiaotong University, Xi’an 710049, China;3. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States;4. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;5. Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China |
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| 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. |
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| Keywords: | Thermoelectrics Hot extrusion (HE) Spark plasma sintering (SPS) |
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