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Dispersion of multi-walled carbon nano tubes in skutterudites and its effect on thermoelectric and mechanical properties

Schmitz, Andreas und Schmid, Carolin und de Boor, Johannes und Müller, Eckhard (2017) Dispersion of multi-walled carbon nano tubes in skutterudites and its effect on thermoelectric and mechanical properties. Journal of Nanoscience and Nanotechnology. American Scientific Publishers. doi: 10.1166/jnn.2017.13727. ISSN 1533-4880.

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Kurzfassung

Filled cobalt-antimony based skutterudites have proven themselves as very promising thermoelectric materials for generator applications in an intermediate temperature range between 400 and 800 K due to their high figure of merit. Besides the functional thermoelectric properties also the skutterudites’ mechanical properties play an important role to withstand external mechanical and internal thermomechanical loads during operation. Properties of interest are hardness as well as fracture toughness and resistance to fatigue. Carbon nano tubes are well known for their high tensile strength and may therefore be used to increase the mechanical strength of composite materials. Additionally, the thermoelectric properties of the composite material might benefit from the high electrical conductivity of carbon nano tubes and increased phonon scattering at interfaces between matrix and carbon nano tube. A main precondition for benefiting from embedded nano-tubes is to achieve a homogeneous distribution of the CNTs and good adhesion between carbon nano tube and matrix material. In this work we present the influence of the introduction of multi-walled carbon nano tubes on the thermoelectric and mechanical properties of p-type skutterudites Ce0.14La0.06Co2Fe2Sb12. The influence of different carbon nano tube concentrations and preparation routes on the resulting composite material’s thermoelectric, mechanical and microstructural properties is studied. A reduction of electrical and thermal conductivity as well as fracture strength is observed with increasing carbon nano tube content which is attributed to strong agglomeration of the nano tubes. The results underline the pivotal role of a homogeneous distribution of the carbon nano tubes for improving the mechanical properties of skutterudites.

elib-URL des Eintrags:https://elib.dlr.de/115097/
Dokumentart:Zeitschriftenbeitrag
Titel:Dispersion of multi-walled carbon nano tubes in skutterudites and its effect on thermoelectric and mechanical properties
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schmitz, Andreasgerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schmid, Carolingerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
de Boor, Johannesgerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167NICHT SPEZIFIZIERT
Müller, Eckhardgerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:1 März 2017
Erschienen in:Journal of Nanoscience and Nanotechnology
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1166/jnn.2017.13727
Verlag:American Scientific Publishers
ISSN:1533-4880
Status:veröffentlicht
Stichwörter:Carbon nano tubes; Mechanical properties; Skutterudites; Thermoelectric properties; Thermoelectricity
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC-Antriebsstrang (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Thermoelektrische Materialien und Systeme
Hinterlegt von: Yasseri, Mohammad
Hinterlegt am:22 Nov 2017 10:20
Letzte Änderung:27 Nov 2023 12:07

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