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@PHDTHESIS{Willberg:811743,
author = {Willberg, Malte},
title = {{G}laslotfügen von {F}estoxid-{B}rennstoffzellen durch
{L}aseraufschmelzung},
volume = {329},
school = {Universität Bochum},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2016-04110},
isbn = {978-3-95806-157-6},
series = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
Umwelt / Energy $\&$ Environment},
pages = {99 S.},
year = {2016},
note = {Universität Bochum, Diss., 2015},
abstract = {Planar Solid Oxide Fuel Cells (SOFCs) are usually sealed
and joined using glass solder. The sealing material needs to
be electrically isolating, mechanically stable at working
temperature and during thermal-cycling, and the thermal
expansion coefficient needs to be adapted to the materials
connected. Glass solder has evolved as the primary sealing
material, since it serves the demands best. The sealing of
SOFCs is done in a furnace. The sealing and joining
temperature must not be significantly higher than the
working temperature of the SOFC, otherwise it would get
damaged. The choice of glass solders is therefore limited.
Furthermore, furnace joining takes a lot of time. Aiming at
an economical production, the application of a laser as a
heat source for successful joining was examined. This was
done to industrialize the SOFC, in the scope of an
EU-project for the development of MMLCR=SOFCs (Working
towards Mass Manufactured, Low Cost and Robust Solid Oxide
Fuel Cell stacks). Without preparation, laser joining can
theoretically be done in a few minutes, which bears the
potential of cheaper joining. Within this thesis, it was
examined how joining with a laser could be done with the
same quality of bonds as in furnace joining. The glass
solders for laser joining do not need to be the same as
those for furnace joining. Thus, higher joining temperatures
can be reached with a laser without damaging the SOFC. In
this way, glass solders with higher transformation
temperatures can be used. Such glass solders can have better
properties regarding other demands. Joining of glass solder
and steel with a laser was successfully done. The geometry
of the steel frames of an SOFC is a big challenge for laser
joining, since wetting by glass solder is hardly possible.
Successful sealing with a laser also requires thicker steel
sheets than those used in mass production.},
cin = {IEK-1},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {135 - Fuel Cells (POF3-135) / SOFC - Solid Oxide Fuel Cell
(SOFC-20140602) / HITEC - Helmholtz Interdisciplinary
Doctoral Training in Energy and Climate Research (HITEC)
(HITEC-20170406)},
pid = {G:(DE-HGF)POF3-135 / G:(DE-Juel1)SOFC-20140602 /
G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/811743},
}