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Integrated testing approach using a customized micro turbine for a volcanic ash and CMAS related degradation study of thermal barrier coatings.

Naraparaju, Ravisankar and Lau, Hendrik and Lange, Martin and Fischer, Christian and Kramer, Dietmer and Schulz, Uwe and Weber, Konradin (2018) Integrated testing approach using a customized micro turbine for a volcanic ash and CMAS related degradation study of thermal barrier coatings. Surface and Coatings Technology, 337, pp. 198-208. Elsevier. DOI: 10.1016/j.surfcoat.2018.01.030 ISSN 0257-8972

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Abstract

Abstract: A volcanic ash (VA) test stand has been built with a precise particle feeder, concentration measuring unit and a mini turbine with an integrated thermal barrier coating (TBC) system on the blisk for the first time in a laboratory scale. This setup has allowed the testing of melting, sticking, corrosion and erosion behaviour of volcanic ash in-situ at high temperature in a realistic manner in a gas turbine. Moreover, this mini engine runs with kerosene which could also bring all the impurities such as sulphur in to system which might change the reaction mechanisms of TBC and VA. The particle size influence on the sticking/escape behaviour in the engine components was tested but a clear statement on the particle size versus its sticking behaviour could not be made, although the particles in the size range of 1-10 µm are more susceptible to melting in the given conditions. The blisks were coated with two different TBC materials such as 7 wt.% Yttria Stabilised Zirconia (7YSZ) and Gadolinium Zirconate (GZO) using Electron Beam Physical Vapour Deposition (EB-PVD) technique. Both coatings were tested in corrosion-erosion regime under VA at high temperature and it was found out that the coating with higher toughness (7YSZ) has performed better than the other coating under the used testing conditions.

Item URL in elib:https://elib.dlr.de/119205/
Document Type:Article
Title:Integrated testing approach using a customized micro turbine for a volcanic ash and CMAS related degradation study of thermal barrier coatings.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.deUNSPECIFIED
Lau, HendrikHendrik.Lau (at) dlr.deUNSPECIFIED
Lange, MartinUNSPECIFIEDUNSPECIFIED
Fischer, ChristianUNSPECIFIEDUNSPECIFIED
Kramer, DietmerUNSPECIFIEDUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Weber, KonradinUNSPECIFIEDUNSPECIFIED
Date:January 2018
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:337
DOI :10.1016/j.surfcoat.2018.01.030
Page Range:pp. 198-208
Publisher:Elsevier
ISSN:0257-8972
Status:Published
Keywords:Volcanic ash, CMAS, TBCs, Turbine blisk, GZO, 7YSZ.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:08 Mar 2018 09:21
Last Modified:31 Jul 2019 20:16

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