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TBC corrosion by volcanic ash – properties and behavior of natural and artificial test dusts

Mechnich, Peter (2015) TBC corrosion by volcanic ash – properties and behavior of natural and artificial test dusts. 39th International Conference on Advanced Ceramics & Composites, 1.-6. Feb. 2015, Daytona Beach, USA.

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Abstract

The ingestion and subsequent deposition of volcanic ash (VA) is considered a major threat to performance and lifetime of aero-engines. Degradation of ceramic thermal barrier coatings (TBCs) of combustor walls, turbine blades and vanes is associated with chemical interaction between the TBC material and molten VA. Infiltration of molten VA also may affect the strain tolerance of TBCs, making them susceptible to “cold shock” fracture and subsequent spallation. Today there is still a major lack in the definition of standardized VA test dusts suited for ground testing and laboratory experiments. Chemical compositions and morphologies of natural volcanic ashes (NVA) are highly complex and variable. Artificial volcanic ash (AVA) is considered a promising alternative to NVA, providing tailored chemical composition and particle morphology. Key properties such as wetting and infiltration behavior of genuine volcanic ash (Ejafjalla, Iceland) and similar AVA test dusts are compared on the example of standard EB-PVD 7-YSZ TBC. Furthermore, a variety of properties of VA relevant to aero-engine operation are investigated.

Item URL in elib:https://elib.dlr.de/99415/
Document Type:Conference or Workshop Item (Speech)
Title:TBC corrosion by volcanic ash – properties and behavior of natural and artificial test dusts
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterWF-SFKUNSPECIFIED
Date:4 February 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:volcanic ash, TBC, corrosion
Event Title:39th International Conference on Advanced Ceramics & Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:1.-6. Feb. 2015
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 - 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:18 Nov 2015 09:34
Last Modified:10 May 2016 23:34

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