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Influence of Annealing and Sintering on the Thermoelectric and Mechanical Properties of Gas Atomized p-type Skutterudites

Schmitz, Andreas and Schmid, Carolin and de Boor, Johannes and Stiewe, Christian and Müller, Eckhard (2015) Influence of Annealing and Sintering on the Thermoelectric and Mechanical Properties of Gas Atomized p-type Skutterudites. Materials Today: Proceedings, 2 (2), pp. 705-713. DOI: 10.1016/j.matpr.2015.05.101 ISSN 2214-7853

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Abstract

Filled cobalt-antimony based skutterudites are very promising thermoelectric materials for generator applications in an intermediate temperature range between 150 and 550 °C. For applications, besides the functional thermoelectric properties also the mechanical properties and production methodsplay an important role. Both thermoelectric and mechanical properties can be varied by adjusting the doping level, filling elements and filling fraction. Furthermore, the properties can be influenced by the choice of preparation routes leading to the formation of certain nano- or microstructures. In this work we investigate the influence of powder treatment and sintering temperature on the properties of p-type In0.2Fe0.28Co3.72Sb12 skutterudites synthesized by gas atomization. After atomization the powder contains a large fraction of secondary phases which transform into the skutterudites phase during short term sintering. This phase transformation supports compaction and sintering. It is shown that the sintering temperature influences the resulting thermoelectric properties beyond pure effects of porosity. Best thermoelectric material propertiesare achieved at sintering temperatures between 550 and 600 °C. Annealing the atomized powder prior to sintering leads to phase pure material for which the sintering temperature only influences the thermoelectric properties via the resulting sample porosity.

Item URL in elib:https://elib.dlr.de/100039/
Document Type:Article
Title:Influence of Annealing and Sintering on the Thermoelectric and Mechanical Properties of Gas Atomized p-type Skutterudites
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
de Boor, JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Stiewe, ChristianGerman 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:11 June 2015
Journal or Publication Title:Materials Today: Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2
DOI :10.1016/j.matpr.2015.05.101
Page Range:pp. 705-713
ISSN:2214-7853
Status:Published
Keywords:Thermoelectricity; skutterudites; gas atomization; short term sintering; spark plasma sintering; hardness; mechanical properties; powder preparation; annealing
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 08:32
Last Modified:10 May 2016 23:36

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