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Reaction sintering and sintering additives for cost-effective production of thermoelectric oxides

Title data

Bresch, Sophie ; Mieller, Björn ; Moos, Ralf ; Rabe, Torsten:
Reaction sintering and sintering additives for cost-effective production of thermoelectric oxides.
Event: VCT 2020 : Virtual Conference on Thermoelectrics , 21.-23. Juli 2020 .
(Conference item: Conference , Speech )

Abstract in another language

Thermoelectric oxides attract much interest recently. Although their thermoelectric properties are inferior to non-oxides, they exhibit distinct advantages. Thermoelectric oxides are stable in air at higher temperatures, their raw materials are less toxic, and more abundant. To enhance attractivity of these materials for industrial applications, production costs need to be reduced. Conventionally, the legs of thermoelectric generators are sintered from green bodies of previously synthesized powder. Reaction-sintering is a fabrication method without a powder synthesis step, as the final phase is formed during the sintering from a raw material mixture. Moreover, the reduction of chemical potential during reaction-sintering is effective as an additional driving force for sintering. We show that reaction-sintering increases the densification of CaMnO3 (n-type, Sm doped). Consequently, the electrical conductivities improved by about 100 % leading to superior power factors (PF = 230 μW/mK2 for CaMnO3). Another approach to reduce the production costs is to lower the sintering temperature by adding sinter additives. The addition of 4 wt% CuO to CaMnO3 lowers the sinter temperature from 1250 °C to 1050 °C. The achieved power factor PF = 264 μW/mK2 is more than two times higher as reported in literature for the same dopant.

Further data

Item Type: Conference item (Speech)
Refereed: No
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 04 Sep 2020 07:49
Last Modified: 04 Sep 2020 07:49
URI: https://eref.uni-bayreuth.de/id/eprint/56803