elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Solid-State CMAS Corrosion of an EB-PVD YSZ Coated Turbine Blade: Zr4+Partitioning and Phase Evolution

Mechnich, Peter and Braue, Wolfgang (2015) Solid-State CMAS Corrosion of an EB-PVD YSZ Coated Turbine Blade: Zr4+Partitioning and Phase Evolution. Journal of the American Ceramic Society, 98 (1), pp. 296-302. Wiley. DOI: [10.1111/jace.13241] ISSN 0002-7820

[img] PDF
575kB

Abstract

The corrosion of an ex-service 7-YSZ coated high-pressure turbine blade by Si-undersaturated, Fe-,Ti-rich CMAS (FTCMAS) was investigated. The constituents of the FT-CMAS deposit and its synthetic laboratory counterpart are identified by means of analytical SEM and XRD. FT-CMAS mainly consists of rhonite-, melilite-, and clinopyroxene-type solid solutions. FT-CMAS reacts with the 7-YSZ thermal barrier coating to a continuous layer of a Ca,Zr-rich garnet phase also known as kimzeyite. The microstructural analysis indicates that kimzeyite has formed via solid-state reaction. The formation of kimzeyite was studied in laboratory using YSZ/FT-CMAS diffusion couples and powder compacts. Experiments provide strong evidence that kimzeyite is forming predominantly from YSZ and melilite, whereas clinopyroxene and especially rhonite appear relative stable versus YSZ. The preferred kimzeyite formation from melilite and YSZ is explained by the availability of sixfold coordinated lattice sites for Zr4+ on melilite decomposition and subsequent garnet crystallization.

Item URL in elib:https://elib.dlr.de/112279/
Document Type:Article
Title:Solid-State CMAS Corrosion of an EB-PVD YSZ Coated Turbine Blade: Zr4+Partitioning and Phase Evolution
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterWF-SFKUNSPECIFIED
Braue, WolfgangWF-SFKUNSPECIFIED
Date:January 2015
Journal or Publication Title:Journal of the American Ceramic Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:98
DOI :[10.1111/jace.13241]
Page Range:pp. 296-302
Publisher:Wiley
ISSN:0002-7820
Status:Published
Keywords:corrosion, CMAS, TBC, YSZ, turbine blade
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 - Combusion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Keramische Strukturwerkstoffe
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:11 May 2017 07:00
Last Modified:31 Jul 2019 20:09

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.