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Vacuum plasma sprayed insulating layers suitable for brazing in high temperature fuel cells

Arnold, Johannes and Ansar, Asif and Ruckdäschel, Robert and Henne, Rudolf and Maier, Uwe and Grünling, Hermann W. (2011) Vacuum plasma sprayed insulating layers suitable for brazing in high temperature fuel cells. In: Abstracts and manuscripts of the ITSC- Conference 2011 in Hamburg, 276, pp. 143-148. DVS Media GmbH, Düsseldorf. ITSC 2011, 27.-29.09.2011, Hamburg, Germany. ISBN 978-3-87155-268-7

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Abstract

SOFCs for mobile applications require short starting times and capability of withstanding several and severe cycles. For such applications metallic cassette type cells with low weight and thermal capacity are beneficial where the active cell part is set in interconnects consisting of two sheets of ferritic steel. These cells are stacked serially to get higher voltage and power. This approach needs interconnect sheets that are electrically insulated from each other to prevent electrical short circuit. The technology discussed here is to use brazed metals, as sealants, and ceramic layers, as electrical insulators, which are vacuum plasma sprayed on the cassette rims. For reliable insulating layers, a variety of deposits were developed, starting from cermet-spinel multilayers with various compositions and constituents, where reactive metals (such as Ti, Zr) were part of the coatings, to pure ceramic layers. The qualities and characteristics of these coatings were investigated which included electric insulation at room temperature and at 800 °C (SOFC operating temperature), wettability of different brazes towards these deposits, phase stability and peeling strength. The single steps of development, characteristics of the insulating layers for SOFCs as well as some challenges that have to be taken into account in the process are described.

Item URL in elib:https://elib.dlr.de/71140/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Vacuum plasma sprayed insulating layers suitable for brazing in high temperature fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arnold, JohannesDLR - Technische ThermodynamikUNSPECIFIED
Ansar, AsifDLR - Technische ThermodynamikUNSPECIFIED
Ruckdäschel, RobertDLR - Technische ThermodynamikUNSPECIFIED
Henne, RudolfElringKlinger AGUNSPECIFIED
Maier, UweElringKlinger AGUNSPECIFIED
Grünling, Hermann W.MatConsultUNSPECIFIED
Date:27 September 2011
Journal or Publication Title:Abstracts and manuscripts of the ITSC- Conference 2011 in Hamburg
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:276
Page Range:pp. 143-148
Publisher:DVS Media GmbH, Düsseldorf
Series Name:DVS-Berichte
ISBN:978-3-87155-268-7
Status:Published
Keywords:SOFC, interconnect sheets, electrical insulation, sealants, ceramic layers, vacuum plasma sprayed, cermets, joining, reactive air brazing.
Event Title:ITSC 2011
Event Location:Hamburg, Germany
Event Type:international Conference
Event Dates:27.-29.09.2011
Organizer:Deutscher Verband für Schweißtechnik (DVS), TSS, iiw
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Arnold, Dr.-Ing. Johannes
Deposited On:10 Oct 2011 10:50
Last Modified:31 Jul 2019 19:32

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