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Complex Melting Behavior of Si-lean, Fe-Ti-CMAS and its Effects on the Recession of EB-PVD Gadolinium-Zirconate TBC

Mechnich, Peter (2019) Complex Melting Behavior of Si-lean, Fe-Ti-CMAS and its Effects on the Recession of EB-PVD Gadolinium-Zirconate TBC. 43rd International Conference on Advanced Ceramics & Composites, 27. Jan. - 1. Feb. 2019, Daytona Beach, USA.

Full text not available from this repository.

Abstract

First and second stage high-pressure turbine blades of aeroengines are typically made of Ni-based superalloys protected by thermal barrier coatings (TBC). In operation, state of the art EB-PVD ZrO2 TBC experience severe degradation by airborne inorganic particles commonly referred to as CMAS (CaO-MgO-Al2O2-SiO2). CMAS particle ingestion, deposition, and subsequent melt infiltration is a major reason for premature TBC failure. A promising way to overcome the CMAS problem is the use of highly reactive TBC/EBC materials which can trigger rapid crystallization of CMAS melts, thus mitigating melt infiltration. A variety of new TBC materials such as rare-earth zirconates having low thermal conductivity exhibit such promising resistance against simplified CMAS compositions. However, partial or incongruent melting of CMAS constituents lead to complex reaction and infiltration scenarios. Such kinds of effects were studied on EB-PVD Gd2Zr2O7 coatings and synthetic Fe, Ti rich CMAS mimicking deposits on ex-service turbine blades. It turns out that such Si-lean, fully crystalline CMAS deposits are exhibiting phase equilibria, stepwise melting, and reactions which are very sensitive to their respective bulk chemical composition, thus making it difficult to assess the corrosion resistance and operation limits of new TBC materials.

Item URL in elib:https://elib.dlr.de/130302/
Document Type:Conference or Workshop Item (Speech)
Title:Complex Melting Behavior of Si-lean, Fe-Ti-CMAS and its Effects on the Recession of EB-PVD Gadolinium-Zirconate TBC
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterPeter.Mechnich (at) dlr.deUNSPECIFIED
Date:January 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CMAS, TBC
Event Title:43rd International Conference on Advanced Ceramics & Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:27. Jan. - 1. Feb. 2019
Organizer:The American Ceramic Society
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 - Combustion Chamber Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:21 Nov 2019 09:02
Last Modified:21 Nov 2019 09:02

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