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EFFECT OF ADDITIVES ON SELF-HEALING OF PLASMA SPRAYED CERAMIC COATINGS

Sata, Noriko and Ansar, Asif and Friedrich, K. Andreas (2016) EFFECT OF ADDITIVES ON SELF-HEALING OF PLASMA SPRAYED CERAMIC COATINGS. In: Ceramics for Energy Conversion, Storage, and Distribution Systems, 255, pp. 3-17. The American Ceramic Society. 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications, June 14-19, 2015, Vancouver, BC, Canada. ISBN 978-1-119-23448-7 ISSN 1042-1122

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Abstract

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/98682/
Document Type:Conference or Workshop Item (Speech)
Title:EFFECT OF ADDITIVES ON SELF-HEALING OF PLASMA SPRAYED CERAMIC COATINGS
Authors:
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:2016
Journal or Publication Title:Ceramics for Energy Conversion, Storage, and Distribution Systems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:255
Page Range:pp. 3-17
Editors:
EditorsEmail
Sata, Norikonoriko.sata@dlr.de
Ansar, Asifasif.ansar@dlr.de
Friedrich, K. AndreasAndreas.Friedrich@dlr.de
Publisher:The American Ceramic Society
Series Name:Ceramic Transactions
ISSN:1042-1122
ISBN:978-1-119-23448-7
Status:Published
Keywords:Self-healing, Plasam spray, Cohesive zone model
Event Title:11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications
Event Location:Vancouver, BC, Canada
Event Type:international Conference
Event Dates:June 14-19, 2015
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: Metzger-Sata, Dr. Noriko
Deposited On:27 Oct 2016 10:47
Last Modified:16 Nov 2016 14:35

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