About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
|
Presentation Title |
Influence of Laser Processing Parameters on Thermoelectric and Microstructural Properties of Bi2Te3 |
Author(s) |
Saniya LeBlanc, Eric Fodran, Eric Barnes, Cagri Oztan |
On-Site Speaker (Planned) |
Saniya LeBlanc |
Abstract Scope |
Thermoelectric energy conversion devices are used for thermal management and waste heat recovery. Conventional thermoelectric manufacturing techniques are laborious, allow only planar geometries, and result in considerable waste of material, impeding widespread use of thermoelectric systems. To mitigate these challenges, additive manufacturing has emerged as an alternative. We explored the process-structure-property relationship of laser powder bed fusion of undoped Bi2Te3. Using optimized laser power and scan speed from previous work, we investigated the effects of variation in secondary processing parameters such as layer height, hatch spacing, scan pattern and rescanning on microstructure and thermoelectric properties. Laser processed bulk samples were characterized for elemental composition, microstructure, relative density, and thermoelectric power factor. The results reveal that scan pattern and number of scan can be optimized to enhance the relative density and electrical conductivity, and repeated rescanning caused a change in the majority charge carriers, resulting in a negative Seebeck coefficient. |