elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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.

[img] PDF - Registered users only
2MB

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/100984/
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:16 June 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.