Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling

Mikko Pihlatie (Corresponding Author), Andreas Kaiser, Mogens Mogensen

    Research output: Contribution to journalArticleScientificpeer-review

    85 Citations (Scopus)

    Abstract

    The Impulse Excitation Technique (IET) was used to determine the elastic modulus and specific damping of different Ni/NiO–YSZ composites suitable for use in solid oxide fuel cells (SOFC). The porosity of the as-sintered samples varied from 9 to 38% and that of the reduced ones from 31 to 52%. For all samples a linear relation between Young's modulus and porosity was found. The temperature dependency of the mechanical properties of both as-sintered and reduced composites was investigated by IET up to 1200 °C. In the as-sintered state, first an increase and peak of stiffness coinciding with the Néel temperature, 250 °C, of NiO was observed. Above this temperature, a linear decrease occurred. Specific damping showed a peak at 170–180 °C and increased above ca. 1000 °C in NiO–YSZ. In the reduced state the elastic modulus decreased linearly with temperature; specific damping increased above ca. 600 °C and was found to be very dependent on microstructure. Damage caused by redox cycling degraded the elastic properties of the composites. Degradation started linearly from 0.5 to 0.6% redox strain leading to macroscopic sample failures at about 2.5% dL/Lo. A simple continuum elastic damage model was fitted to the degradation data.
    Original languageEnglish
    Pages (from-to)1657-1664
    Number of pages8
    JournalJournal of the European Ceramic Society
    Volume29
    Issue number9
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Porosity
    Mechanical properties
    Damping
    Elastic moduli
    Composite materials
    Degradation
    Temperature
    Solid oxide fuel cells (SOFC)
    Stiffness
    Microstructure
    Oxidation-Reduction

    Keywords

    • Fuel cells
    • Mechanical properties
    • Composites
    • Plasticity
    • SOFC

    Cite this

    @article{56d4741710c74ec58abbfdc2e57d19db,
    title = "Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling",
    abstract = "The Impulse Excitation Technique (IET) was used to determine the elastic modulus and specific damping of different Ni/NiO–YSZ composites suitable for use in solid oxide fuel cells (SOFC). The porosity of the as-sintered samples varied from 9 to 38{\%} and that of the reduced ones from 31 to 52{\%}. For all samples a linear relation between Young's modulus and porosity was found. The temperature dependency of the mechanical properties of both as-sintered and reduced composites was investigated by IET up to 1200 °C. In the as-sintered state, first an increase and peak of stiffness coinciding with the N{\'e}el temperature, 250 °C, of NiO was observed. Above this temperature, a linear decrease occurred. Specific damping showed a peak at 170–180 °C and increased above ca. 1000 °C in NiO–YSZ. In the reduced state the elastic modulus decreased linearly with temperature; specific damping increased above ca. 600 °C and was found to be very dependent on microstructure. Damage caused by redox cycling degraded the elastic properties of the composites. Degradation started linearly from 0.5 to 0.6{\%} redox strain leading to macroscopic sample failures at about 2.5{\%} dL/Lo. A simple continuum elastic damage model was fitted to the degradation data.",
    keywords = "Fuel cells, Mechanical properties, Composites, Plasticity, SOFC",
    author = "Mikko Pihlatie and Andreas Kaiser and Mogens Mogensen",
    year = "2009",
    doi = "10.1016/j.jeurceramsoc.2008.10.017",
    language = "English",
    volume = "29",
    pages = "1657--1664",
    journal = "Journal of the European Ceramic Society",
    issn = "0955-2219",
    publisher = "Elsevier",
    number = "9",

    }

    Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling. / Pihlatie, Mikko (Corresponding Author); Kaiser, Andreas; Mogensen, Mogens.

    In: Journal of the European Ceramic Society, Vol. 29, No. 9, 2009, p. 1657-1664.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling

    AU - Pihlatie, Mikko

    AU - Kaiser, Andreas

    AU - Mogensen, Mogens

    PY - 2009

    Y1 - 2009

    N2 - The Impulse Excitation Technique (IET) was used to determine the elastic modulus and specific damping of different Ni/NiO–YSZ composites suitable for use in solid oxide fuel cells (SOFC). The porosity of the as-sintered samples varied from 9 to 38% and that of the reduced ones from 31 to 52%. For all samples a linear relation between Young's modulus and porosity was found. The temperature dependency of the mechanical properties of both as-sintered and reduced composites was investigated by IET up to 1200 °C. In the as-sintered state, first an increase and peak of stiffness coinciding with the Néel temperature, 250 °C, of NiO was observed. Above this temperature, a linear decrease occurred. Specific damping showed a peak at 170–180 °C and increased above ca. 1000 °C in NiO–YSZ. In the reduced state the elastic modulus decreased linearly with temperature; specific damping increased above ca. 600 °C and was found to be very dependent on microstructure. Damage caused by redox cycling degraded the elastic properties of the composites. Degradation started linearly from 0.5 to 0.6% redox strain leading to macroscopic sample failures at about 2.5% dL/Lo. A simple continuum elastic damage model was fitted to the degradation data.

    AB - The Impulse Excitation Technique (IET) was used to determine the elastic modulus and specific damping of different Ni/NiO–YSZ composites suitable for use in solid oxide fuel cells (SOFC). The porosity of the as-sintered samples varied from 9 to 38% and that of the reduced ones from 31 to 52%. For all samples a linear relation between Young's modulus and porosity was found. The temperature dependency of the mechanical properties of both as-sintered and reduced composites was investigated by IET up to 1200 °C. In the as-sintered state, first an increase and peak of stiffness coinciding with the Néel temperature, 250 °C, of NiO was observed. Above this temperature, a linear decrease occurred. Specific damping showed a peak at 170–180 °C and increased above ca. 1000 °C in NiO–YSZ. In the reduced state the elastic modulus decreased linearly with temperature; specific damping increased above ca. 600 °C and was found to be very dependent on microstructure. Damage caused by redox cycling degraded the elastic properties of the composites. Degradation started linearly from 0.5 to 0.6% redox strain leading to macroscopic sample failures at about 2.5% dL/Lo. A simple continuum elastic damage model was fitted to the degradation data.

    KW - Fuel cells

    KW - Mechanical properties

    KW - Composites

    KW - Plasticity

    KW - SOFC

    U2 - 10.1016/j.jeurceramsoc.2008.10.017

    DO - 10.1016/j.jeurceramsoc.2008.10.017

    M3 - Article

    VL - 29

    SP - 1657

    EP - 1664

    JO - Journal of the European Ceramic Society

    JF - Journal of the European Ceramic Society

    SN - 0955-2219

    IS - 9

    ER -