Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898766 | Journal of the European Ceramic Society | 2018 | 8 Pages |
Abstract
The sintering behavior and the thermoelectric performance of Ca3Co4O9 multilayer laminates were studied, and a multilayer thermoelectric generator was fabricated. Compacts and multilayer samples with anisotropic microstructure and residual porosity were obtained after conventional sintering at 920 °C, whereas dense and isotropic multilayer samples were prepared by firing at 1200 °C and reoxidation at 900 °C. A hot-pressed sample has a dense and anisotropic microstructure. Samples sintered at 920 °C exhibit low electrical conductivity due to the low density, whereas the Seebeck coefficient is not sensitive to preparation conditions. However, thermal conductivity of multilayers is very low, and, hence acceptable ZT values are obtained. A transversal multilayer thermoelectric generator (TMLTEG) was fabricated by stacking layers of Ca3Co4O9 green tapes, AgPd conductor printing, and co-firing at 920 °C. The TMLTEG has a power output of 3 mW at ÎT = 200 K in the temperature interval of 25 °C to 300 °C.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Thomas Schulz, Timmy Reimann, Arne Bochmann, Andre Vogel, Beate Capraro, Björn Mieller, Steffen Teichert, Jörg Töpfer,