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Effect of additives on self-healing of plasma sprayed ceramic coatings

Sata, Noriko and Ansar, Asif and Friedrich, K. Andreas (2015) Effect of additives on self-healing of plasma sprayed ceramic coatings. CMCEE-11 2015, 14.-19. Jun.2016, Vancouver, Kanada.

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MgAl2O4 coatings, used for electrical insulation along the metallic seals in high temperature fuel cell stacks, tend to fail prematurely due to generated stresses during on-off thermal cycles. To enhance stress bearing capability and the durability of these coatings, self-healing was investigated by introducing additives consisting of SiC as primary additive along with a secondary additive material. Secondary additives were one of the following compounds: BaO, CaO, ZnO, Y2O3, Al2O3, La2O3, TiO2, GeO2, Ce0.9Gd0.1O1.95 (GDC) or Ta2O5. Crack healing can be attained due to reaction between SiC, secondary additive and oxygen that was transported to the additive due to a crack. Such reaction would be associated to a phase formation in the additive material linked with mass and volume increase assisting in closure of the advancing crack. Using TGA/DSC reaction temperatures and mass gains of SiC with or without secondary additives were identified. SiC+Y2O3 and SiC+ZnO were opted as promising additive materials. 20 wt% (SiC+Y2O3) containing MgAl2O4 coatings were produced by plasma spraying. In these developed coatings, healing was demonstrated after heat treatment at 1050°C in air for 10 hour. Defect healing in spinel coating with SiC+ZnO is under investigation.

Item URL in elib:https://elib.dlr.de/100984/
Document Type:Conference or Workshop Item (Speech)
Title:Effect of additives on self-healing of plasma sprayed ceramic coatings
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sata, NorikoNoriko.Sata (at) dlr.deUNSPECIFIED
Ansar, Asifasif.ansar (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:16 June 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:self healing coatings, materials, processes
Event Title:CMCEE-11 2015
Event Location:Vancouver, Kanada
Event Type:international Conference
Event Dates:14.-19. Jun.2016
Organizer:The American Ceramic Society
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:15 Dec 2015 09:52
Last Modified:15 Dec 2015 09:52

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