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Thermal Cycle Stability of SOFC Seal Material

Author: DaiZhou
Tutor: LiJian
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: The solid oxide fuel cell Sealing material Al2O3 Al Thermal cycling
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
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Abstract


High temperature sealing restricting the commercialization of a key issue in the solid oxide fuel cell (SOFC) has been solved with different materials and methods in the airtightness after the start of the study of the sealing material of the SOFC to the long-term stability of the sealing material, heat The cycle performance as the main content. The This paper early in the laboratory successfully developed Al 2 O 3 -based sealing material based on the overall performance is better Al-Al 2 O 3 system to study its thermal cycle performance. The tape casting Al 2 O 3 -based sealing materials under different loads and ventilation pressure showed good sealing effect. With the increase of Al content Al 2 O 3 -based composite sealing material sealing effect has been significantly improved. Under thermal cycling conditions, the leak rate measurement to evaluate Al 2 O 3 -based sealing material thermal cycling performance. 0.2MPa applied load and 3.5kPa ventilation pressure, all Al 2 O 3 -based composite sealing material during thermal cycling to maintain a low leakage gas rate, lower than the 0.04 sccm. cm -1 . During thermal cycling, Al 2 O 3 -based composite sealing material leak rate increased gradually improve the thermal cycling performance with increasing Al content. The ACS3 samples in the Al content 30% experienced 92 thermal cycles, the leakage rate is almost no significant change, showed the best thermal cycle performance. The microstructure observed Al oxidation and deformation of the spherical shell-like structure may be formed of a conducive sealing. Reasonable explanation of the impact of the addition of Al thermal cycling performance. Interface found in the sandwich structure of the connection body / seal material / PEN samples, including micro-cracks, shedding metal connector body corrosion and different types of leak channel. For these leaks channel generated result of the role of stress during thermal cycling, the reaction leakage rate gradually increases with the thermal cycling process. This article also select the the better Al comprehensive performance 2 O 3 -based composite sealing material in SOFC cell and stack thermal cycling tests, and stack the application process the found Al 2 O 3 -based composite sealing material thickening designed experimental measurements, the volume change based on the oxidation of Al to explain this phenomenon.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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