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Melt-infiltration of 7 YSZ TBC on the example of two artificial volcanic ash variants

Mechnich, Peter (2016) Melt-infiltration of 7 YSZ TBC on the example of two artificial volcanic ash variants. 40th International Conference on Advanced Ceramics and Composites, 2016-01-24 - 2016-01-29, Daytona Beach, USA.

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The ingestion and subsequent deposition of volcanic ash (VA) is considered a major threat to performance and lifetime of aero-engines. Infiltration of ceramic thermal barrier coatings (TBCs) of combustor walls, turbine blades and vanes by molten VA deposits is associated with loss of strain tolerance, making them susceptible to “cold shock” fracture and subsequent spallation. An estimation of possible TBC damages by VA requires knowledge on dose, thermal history, and melt infiltration kinetics. Due to the high chemical and mineralogical variability of natural volcanic ashes, the selection of a test standard suitable for TBC infiltration experiments is still a major issue. Artificial volcanic ashes (AVA) providing tailored chemical composition and particle morphology are considered promising for standardized laboratory testing. The infiltration behavior of standard 7-YSZ TBC by two AVA test dusts similar to recent eruptions in Iceland, (Ejafjalla, 2010 and Grimsvotn, 2011), is discussed in the light of physical melt properties such as viscosity. It turns out that only small variations of the chemical composition may have major influence on melt infiltration onset and progress.

Item URL in elib:https://elib.dlr.de/108833/
Document Type:Conference or Workshop Item (Speech)
Title:Melt-infiltration of 7 YSZ TBC on the example of two artificial volcanic ash variants
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197UNSPECIFIED
Date:January 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermal Barrier Coatings, Volcanic Ash
Event Title:40th International Conference on Advanced Ceramics and Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Start Date:24 January 2016
Event End Date:29 January 2016
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:05 Dec 2016 07:04
Last Modified:24 Apr 2024 20:14

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