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Annealing and sintering effects in thermoelectric skutterudites synthesized by gas atomization

Schmitz, Andreas and Schmid, Carolin and Stiewe, Christian and de Boor, Johannes and Müller, Eckhard (2015) Annealing and sintering effects in thermoelectric skutterudites synthesized by gas atomization. Physica Status Solidi (A) - Applications and Materials Science. Wiley. DOI: 10.1002/pssa.201532539 ISSN 1862-6300

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Abstract

Skutterudites on the basis of CoSb3 are among the best thermoelectric materials for generator applications in the intermediate temperature range. Still, to be suitable for a wide range of applications methods for low cost fabrication of large amounts of this material are needed. A process potentially fulfilling these requirements is gas atomization plus consecutive short-term sintering. As the powder produced by atomization is usually not single phase skutterudite material, the subsequent processes of sintering and eventually annealing prior to sintering play an important role for the resulting material's thermoelectric properties. In this work, we investigate the influence of powder annealing and sintering on the properties of indium-filled skutterudites synthesized by gas atomization. The phase composition and thermoelectric properties are investigated as functions of the sintering temperature. Furthermore, the influence of an intermediate annealing step prior to sintering is investigated. It is shown short sintering times at temperatures around 450 °C are sufficient to achieve dense single phase skutterudite material from atomized powder whereas for annealed skutterudite powder sintering temperatures higher than 550 °C are needed for dense samples. Furthermore, sintering temperature and annealing are shown to have strong influences on the microstructure and thermoelectric properties of the material.

Item URL in elib:https://elib.dlr.de/100137/
Document Type:Article
Title:Annealing and sintering effects in thermoelectric skutterudites synthesized by gas atomization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmitz, AndreasGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Schmid, CarolinGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor, JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany and Justus Liebig University Giessen, Institute of Inorganic and Analytical Chemistry, 35392 Giessen, GermanyUNSPECIFIED
Date:26 October 2015
Journal or Publication Title:Physica Status Solidi (A) - Applications and Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/pssa.201532539
Publisher:Wiley
ISSN:1862-6300
Status:Published
Keywords:thermoelectric materials, skutterudites, gas atomization
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesystem III (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:30 Nov 2015 08:33
Last Modified:06 Sep 2019 15:29

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