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

Sata, Noriko und Ansar, Asif und Friedrich, K. Andreas (2015) Effect of additives on self-healing of plasma sprayed ceramic coatings. CMCEE-11 2015, 2016-06-14 - 2016-06-19, Vancouver, Kanada.

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/100984/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Effect of additives on self-healing of plasma sprayed ceramic coatings
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Sata, NorikoNoriko.Sata (at) dlr.dehttps://orcid.org/0000-0002-3103-2051NICHT SPEZIFIZIERT
Ansar, Asifasif.ansar (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Friedrich, K. Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:16 Juni 2015
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:self healing coatings, materials, processes
Veranstaltungstitel:CMCEE-11 2015
Veranstaltungsort:Vancouver, Kanada
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:14 Juni 2016
Veranstaltungsende:19 Juni 2016
Veranstalter :The American Ceramic Society
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Brennstoffzellen
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Brennstoffzellen) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Friedrich, Prof.Dr. Kaspar Andreas
Hinterlegt am:15 Dez 2015 09:52
Letzte Änderung:24 Apr 2024 20:06

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