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Three-dimensional t...
Three-dimensional thermal stress analysis of the re-oxidized Ni-YSZ anode functional layer in solid oxide fuel cells
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- Kim, Jun Woo (författare)
- Korea Univ, South Korea
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- Bae, Kiho (författare)
- Korea Univ, South Korea; KIST, South Korea
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- Kim, Hyun Joong (författare)
- Korea Univ, South Korea
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- Son, Ji-won (författare)
- KIST, South Korea; Korea Univ Sci and Technol UST, South Korea
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- Kim, Nam Keun (författare)
- Linköpings universitet,Avdelningen för neuro- och inflammationsvetenskap,Medicinska fakulteten,Incheon Natl Univ, South Korea
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- Stenfelt, Stefan (författare)
- Linköpings universitet,Avdelningen för Logopedi, Audiologi och Otorhinolaryngologi,Medicinska fakulteten
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- Prinz, Fritz B. (författare)
- Stanford Univ, CA 94305 USA; Stanford Univ, CA 94305 USA
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- Shim, Joon Hyung (författare)
- Korea Univ, South Korea; Stanford Univ, CA 94305 USA
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(creator_code:org_t)
- ELSEVIER SCIENCE SA, 2018
- 2018
- Engelska.
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Ingår i: Journal of Alloys and Compounds. - : ELSEVIER SCIENCE SA. - 0925-8388 .- 1873-4669. ; 752, s. 148-154
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Nickel-yttria-stabilized zirconia (Ni-YSZ) cermet is widely used as an anode material in solid oxide fuel cells (SOFCs); however, Ni re-oxidation causes critical problems due to volume expansion, which causes high thermal stress. We fabricated a Ni-YSZ anode functional layer (AFL), which is an essential component in high-performance SOFCs, and re-oxidized it to investigate the related three-dimensional (3D) microstructural and thermo-mechanical effects. A 3D model of the re-oxidized AFL was generated using focused ion beam-scanning electron microscope (FIB-SEM) tomography. Re-oxidation of the Ni phase caused significant volumetric expansion, which was confirmed via image analysis and calculation of the volume fraction, connectivity, and two-phase boundary density. Finite element analysis (FEA) with simulated heating to 500-900 degrees C confirmed that the thermal stress in re-oxidized Ni-YSZ is concentrated at the boundaries between YSZ and re-oxidized NiO (nickel oxide). NiO is subjected to more stress than YSZ. Stress exceeding the fracture stress of 8 mol% YSZ appears primarily at 800 degrees C or higher. The stress is also more severe near the electrolyte-anode boundary than in the Ni-YSZ cermet and the YSZ regions. This may be responsible for the electrolyte membrane delamination and fracture that are observed during high-temperature operation. (C) 2018 Elsevier B.V. All rights reserved.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Nyckelord
- NiO-YSZ anode functional layer; 3D reconstruction; Focused ion beam-scanning electron microscope; Finite element analysis; Thermal stress
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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