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Interaction and infiltration behavior of Eyjafjallajökull, Sakurajima volcanic ashes and a synthetic CMAS containing FeO with/in EB-PVD ZrO2-65 wt% Y2 O3 coating at high temperature

Naraparaju, Ravisankar and Gomez Chavez, Juan J and Schulz, Uwe and Ramana, C.V. (2017) Interaction and infiltration behavior of Eyjafjallajökull, Sakurajima volcanic ashes and a synthetic CMAS containing FeO with/in EB-PVD ZrO2-65 wt% Y2 O3 coating at high temperature. Acta Materialia (136), pp. 164-180. Elsevier. DOI: 10.1016/j.actamat.2017.06.055 ISSN 1359-6454

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Abstract

Yttria rich-zirconia thermal barrier coatings (TBCs) with a nominal composition of 65 wt % Y2O3 balanced ZrO2 were deposited by electron-beam physical vapor deposition (EB-PVD) and tested for calciummagnesium- aluminum-silicate (CMAS) infiltration resistance. The infiltration studies were performed with a set of one synthetized CMAS composition and two real volcanic ashes from the Eyjafjallaj€okull volcano located in Iceland and the Sakurajima volcano located in southern Japan. The coatings were tested at 1250 �C for short term (5 min) and long term (intervals from 1 to 20 h). The results indicate a significantly different reaction process for the synthesized CMAS compared with the natural volcanic ashes. The yttria-rich zirconia coatings demonstrate promising results against infiltration by vigorously reacting against the molten glass inducing its crystallization by forming apatite and garnet phases. The formed reaction products effectively sealed the columnar gaps of the TBC and generated a uniform reaction layer that prevented further infiltration.

Item URL in elib:https://elib.dlr.de/113212/
Document Type:Article
Additional Information:Reviewed by Editor
Title:Interaction and infiltration behavior of Eyjafjallajökull, Sakurajima volcanic ashes and a synthetic CMAS containing FeO with/in EB-PVD ZrO2-65 wt% Y2 O3 coating at high temperature
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.deUNSPECIFIED
Gomez Chavez, Juan Jjjgomez2 (at) miners.utep.eduUNSPECIFIED
Schulz, UweUNSPECIFIEDUNSPECIFIED
Ramana, C.V.rvchintalapalle (at) utep.eduUNSPECIFIED
Date:September 2017
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.actamat.2017.06.055
Page Range:pp. 164-180
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:TBC Reaction products EB-PVD Glass infiltration
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:20 Sep 2017 11:07
Last Modified:01 Oct 2019 03:00

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