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WFRF:(Kim Ji Hyun)
 

Sökning: WFRF:(Kim Ji Hyun) > (2015-2019) > Three-dimensional t...

  • Kim, Jun WooKorea Univ, South Korea (författare)

Three-dimensional thermal stress analysis of the re-oxidized Ni-YSZ anode functional layer in solid oxide fuel cells

  • Artikel/kapitelEngelska2018

Förlag, utgivningsår, omfång ...

  • ELSEVIER SCIENCE SA,2018
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:liu-148361
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148361URI
  • https://doi.org/10.1016/j.jallcom.2018.04.176DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Funding Agencies|Korean Ministry of Environment (MOE) as a "Public Technology Program based on Environmental Policy" [E416-00070-0604-0]; National Research Foundation of Korea - Korean government (MSIP) [NRF-2016R1D1A1B03932377]
  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Bae, KihoKorea Univ, South Korea; KIST, South Korea (författare)
  • Kim, Hyun JoongKorea Univ, South Korea (författare)
  • Son, Ji-wonKIST, South Korea; Korea Univ Sci and Technol UST, South Korea (författare)
  • Kim, Nam KeunLinköpings universitet,Avdelningen för neuro- och inflammationsvetenskap,Medicinska fakulteten,Incheon Natl Univ, South Korea(Swepub:liu)kimna55 (författare)
  • Stenfelt, StefanLinköpings universitet,Avdelningen för Logopedi, Audiologi och Otorhinolaryngologi,Medicinska fakulteten(Swepub:liu)stest78 (författare)
  • Prinz, Fritz B.Stanford Univ, CA 94305 USA; Stanford Univ, CA 94305 USA (författare)
  • Shim, Joon HyungKorea Univ, South Korea; Stanford Univ, CA 94305 USA (författare)
  • Korea Univ, South KoreaKorea Univ, South Korea; KIST, South Korea (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Journal of Alloys and Compounds: ELSEVIER SCIENCE SA752, s. 148-1540925-83881873-4669

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