Abstract
A new glass-ceramic composition containing Si, Mg, Ca, Na, Al, Zr and B
is presented here as sealant for planar SOFCs/SOECs, with the aim of
joining the metallic interconnect (Crofer22APU) to the solid oxide cell
(YSZ electrolyte or CGO barrier layer). Characteristic temperature,
thermo-mechanical properties and compositional variations are reviewed
and discussed by thermal analyses and in situ XRD, in order to design
and optimize the sealing profile and reduce the residual porosity. The
glass after heat treatment partially devitrifies into augite and
nepheline with residual glass phase of around 64.3%; after
crystallization the glass-ceramic sealant has a CTE of 12.8 x 10-6 K −1
and it is compliant with the other materials typically used for stack
components.. This work shows that the developed glass-ceramic can
successfully join the ceramic cell with the Crofer22APU (pre-oxidized
and alumina coating), proven by tests on small and large-scale samples.
No signs of unwanted reactions at the glass-metal and the glass-cell
interface are observed and sufficient gas tightness is achieved.
Original language | English |
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Journal | International Journal of Applied Ceramic Technology |
Volume | 15 |
Issue number | 4 |
Pages (from-to) | 1011-1022 |
ISSN | 1546-542X |
DOIs | |
Publication status | Published - 2018 |
Keywords
- Solid oxide fuel cell
- Glass-ceramics
- Synthesis
- Thermal analysis