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Determination of the Influence of Process Parameters on the Thermal Conductivity of Electron-Beam Physical Vapour Deposited Thermal Barrier Coatings by USAXS-Analysis

Flores Renteria, Arturo und Saruhan-Brings, Bilge und Ilavsky, Jan und Allen, Andrew J. (2006) Determination of the Influence of Process Parameters on the Thermal Conductivity of Electron-Beam Physical Vapour Deposited Thermal Barrier Coatings by USAXS-Analysis. International Conference on Metallurgical Coatings and Thin Films, ICMCTF 2006, 2006-05-01 - 2006-05-05, San Diego, CA (USA).

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Kurzfassung

Electron-beam physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) display a lower thermal conductivity compared with the deposited bulk material. This effect is achieved due to the presence of pores within these films. The spatial and geometrical characteristics of the porosity influence directly the magnitude of the achieved reduction of the thermal conductivity. In this work, three EB-PVD coating containing different microstructures were manufactured by varying the manufacturing process parameters during the deposition process. Their corresponding thermal conductivities were measured via the Laser Flash Analysis Method (LFA) in both the as-coated state and after ageing (1100°C/100h). Analysis of the pore formation during processing was carried out by ultrasmall-angle x-ray scattering (USAXS). This technique is supported with a computer based modeling developed by researchers at Advanced Photon Source (APS) in ANL, USA, and in National Institute of Standards and Technology (NIST), USA. The model enables the characterization of the size, shape, volume and orientation of each of the pore populations in EB-PVD TBCs. The effect of these spatial and geometrical characteristics of the porosity on the thermal conductivity of the EB-PVD coatings were studied via a non-interacting approximation based on Maxwell´s model. Results of LFA measurements and the applied approximation indicate an interrelation between the microstructure and the thermal properties of the analyzed EB-PVD coatings. Microstructures containing a higher volume fraction of fine anisotropic intra-columnar pores, and larger voids between feather-arms oriented at lower angles toward the substrate plane correspond to lower thermal conductivity values. Inter-columnar gaps do no significantly contribute to lowering the thermal conductivity due to their orientation parallel to the heat flux and their lower volume fraction compared with the volume occupied by the primary columns. On heat-treatment, the deepest section of the gaps between feather-arms break-up into arrays of nano-sized low aspect ratio voids. The anisotropic, elongated intra-columnar pores evolve toward low aspect ratio shapes that are less effective in reducing the thermal conductivity.

elib-URL des Eintrags:https://elib.dlr.de/45574/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Determination of the Influence of Process Parameters on the Thermal Conductivity of Electron-Beam Physical Vapour Deposited Thermal Barrier Coatings by USAXS-Analysis
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Flores Renteria, ArturoNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Saruhan-Brings, BilgeNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ilavsky, JanAdvanced Photon Source, Argonne National Laboratory, APS-ANL (USA)NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Allen, Andrew J.National Institute of Standards and Technology, NIST (USA)NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:4 Mai 2006
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:EB-PVD, USAXS, Thermal Barrier Coatings, Porosity
Veranstaltungstitel:International Conference on Metallurgical Coatings and Thin Films, ICMCTF 2006
Veranstaltungsort:San Diego, CA (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:1 Mai 2006
Veranstaltungsende:5 Mai 2006
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Turbinentechnologien (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Hochtemperatur-und Funktionsschutzschichten
Hinterlegt von: Flores Renteria, Arturo
Hinterlegt am:06 Dez 2006
Letzte Änderung:24 Apr 2024 19:07

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