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High-temperature interaction of YSZ ceramic coatings and Fe,Ti-enriched CMAS-type deposits

Mechnich, Peter and Braue, Wolfgang (2010) High-temperature interaction of YSZ ceramic coatings and Fe,Ti-enriched CMAS-type deposits. 34th International Conference on Advanced Ceramics and Composites, 25.1.-29.1. 2010, Daytona Beach, USA.

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The interaction of airborne mineral dusts and yttria-stabilized zirconia (YSZ) ceramic coatings is a key issue for turbine engines. In operation airborne inorganic particles stick to hot surfaces of YSZ-coated turbine components and typically form CMAS-type (CaO-MgO-Al2O3-SiO2) deposits. These deposits melt and easily infiltrate YSZ-coatings thus affecting coating performance and lifetime. However, the composition significantly influences the behavior of CMAS-type deposits. In particular the presence of Fe2O3 and TiO2 must be taken into account. Different types of YSZ-coatings (APS, EB-PVD) with artificial Fe- and/or Ti-rich CMAS-type deposits were annealed at temperatures between 1200 and 1300°C. It turns out that the presence of Fe and/or Ti along with a high CaO/SiO2 ratio leads to a solid-state reaction at the CMAS/YSZ interface. A kimzeyite-type calcia-zirconia garnet is formed at the expense of YSZ and Fe,Ti-containing CMAS. However, above the melting temperature of about 1280°C, the newly formed kimzeyite penetrates the YSZ coating producing new YSZ surfaces available for this ZrO2-consuming reaction. This may lead to progressive YSZ recession under cyclic conditions. Since peak surface temperatures of YSZ-coated components of gas turbine engines may exceed 1300°C, this process is considered critical for the durability of YSZ-coatings.

Item URL in elib:https://elib.dlr.de/65176/
Document Type:Conference or Workshop Item (Speech)
Title:High-temperature interaction of YSZ ceramic coatings and Fe,Ti-enriched CMAS-type deposits
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:January 2010
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:YSZ, Coating, Corrosion
Event Title:34th International Conference on Advanced Ceramics and Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:25.1.-29.1. 2010
Organizer:The American Ceramic Socitey
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
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:06 Sep 2010 16:31
Last Modified:06 Sep 2010 16:31

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