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CMAS Attack – A Serious Challenge for Environmental Barrier Coatings

Mechnich, Peter (2018) CMAS Attack – A Serious Challenge for Environmental Barrier Coatings. 42nd International Conference on Advanced Ceramics & Composites, 21.-26.1. 2018, Daytona Beach, USA.

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Abstract

Advanced ceramic matrix composites (CMC) promise higher energy efficiency of turbine engines due to substantially higher operation temperatures. The synergistic effect of heat and water-rich exhaust gases, however, is strongly affecting CMC lifetime. Consequently, the development of new, environmental barrier coatings (EBC) minimizing thermochemical degradation of CMC components is a continuing R&D topic. State of the art turbine components, typically Ni-based superalloys with ZrO2 thermal barrier coatings (TBC) experience severe thermal-chemical degradation by ingested airborne inorganic particles commonly referred to as CMAS. In this context CMAS melt infiltration of TBC is a major reason for premature coating failure. Increasing turbine operation temperatures will aggravate the problem since all kinds of CMAS particles are expected to impinge on turbine components in fully molten, low viscous state. Therefore, new CMC components require EBC materials with much higher CMAS resistance than state-of the art TBC. A promising way to tackle CMAS melt-infiltration is the use of highly reactive EBC materials or alloying elements which can trigger rapid crystallization of CMAS melts, thus enabling the application of EBC-protected CMC also in demanding thermochemical environments. The presentation will give an overview on current developments and directions in this R&D field.

Item URL in elib:https://elib.dlr.de/122739/
Document Type:Conference or Workshop Item (Speech)
Title:CMAS Attack – A Serious Challenge for Environmental Barrier Coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterPeter.Mechnich (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:EBC, TBC, CMAS Attack
Event Title:42nd International Conference on Advanced Ceramics & Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:21.-26.1. 2018
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:08 Nov 2018 11:35
Last Modified:19 Nov 2018 12:14

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