Contact resistance at ceramic interfaces and its dependence on mechanical load

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Low contact resistance between individual components is important for solid oxide fuel cell stacks if high performance is to be achieved. Several mechanisms may result in high contact resistance, e.g., current constriction due to low area of contact and formation of resistive phases between the components.

    In this study, the importance of current constriction due to limited area of contact at an interface is investigated by comparing the characteristics of contacts between LSM pellets with different surface finish.

    The load behaviour of the contact resistance has been investigated and a power law dependence between the load and the contact resistance was found. Higher load resulted in lower contact resistance. The power law exponent depended on surface morphology as well as sample history. Polished surfaces generally showed stronger load dependence than unpolished surfaces.

    The load behaviour of the contact resistance was calculated using a simple model describing the variation of the contact area with load based on the measured surface roughness. Good agreement between the calculations and the experimentally observed resistances was found. (C) 2004 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalSolid State Ionics
    Volume168
    Issue number1-2
    Pages (from-to)1-11
    ISSN0167-2738
    DOIs
    Publication statusPublished - 2004

    Fingerprint Dive into the research topics of 'Contact resistance at ceramic interfaces and its dependence on mechanical load'. Together they form a unique fingerprint.

    Cite this