| About this Abstract |
| Meeting |
2016 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine Grained Materials IX
|
| Presentation Title |
Friction Consolidation Processing of n-Type Bismuth-Telluride Thermoelectric Material |
| Author(s) |
Scott A. Whalen |
| On-Site Speaker (Planned) |
Scott A. Whalen |
| Abstract Scope |
Refined grain size and texture alignment have been shown to improve transport properties in bismuth-telluride (Bi2Te3)-based thermoelectric materials. In this work we demonstrate a new approach, called Friction Consolidation Processing (FCP), for consolidating Bi2Te3 thermoelectric powders into bulk form with a high degree of grain refinement and texture alignment. FCP was demonstrated on n-type Bi2Te3 feedstock powder having a -325 mesh size to form pucks with a diameter of 25.4mm and thickness of 4.2mm. An average grain size of 0.8 micrometers was determined for regions of one sample and a multiple of uniform distribution (MUD) value of 15.49 was calculated for the (0001) pole figure of another sample. ZT=0.37 at 336K was achieved for undoped stoichiometric Bi2Te3, which approximates literature values of ZT=0.5. These results point toward the ability to fabricate bulk thermoelectric materials with refined microstructure and desirable texture using far-from-equilibrium FCP solid-state processing. |
| Proceedings Inclusion? |
Undecided |