Oxidation model for construction materials in supercritical water: estimation of kinetic and transport parameters

Sami Penttilä, Iva Betova, Martin Bojinov, Petri Kinnunen, Aki Toivonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    In the present paper, the kinetic and transport parameters of inner and outer layer growth on two ODS (Oxide Dispersion Strengthened) alloys, PM2000 and MA956, is presented. Parameters are estimated using an upgraded model that assumes that the growth of the outer layer is governed by the transport of cations through the inner layer via an interstitialcy mechanism. The updated model is able to reproduce accurately the depth profiles of individual constituent elements in the inner and outer layers, as well as in the diffusion/transition layer of the alloy situated between the inner layer and the bulk substrate. As a result of the calculations, kinetic and transport parameters of inner and outer layer growth are estimated for oxidation times from 600 to 2000 h at 650 °C. The main conclusion that can be drawn from the calculations is that the most of the rate constants and also the diffusion coefficients tend to decrease with time of oxidation at a constant temperature.
    Original languageEnglish
    Title of host publication Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)
    PublisherVTT Technical Research Centre of Finland
    Number of pages13
    EditionUSB stick
    ISBN (Electronic)978-951-38-8289-1
    ISBN (Print)978-951-38-8290-7
    Publication statusPublished - 2015
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7 - Helsinki, Finland
    Duration: 15 Mar 201518 Mar 2015

    Publication series

    SeriesVTT Technology
    Number216

    Conference

    Conference7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7
    Abbreviated titleISSCWR-7
    CountryFinland
    CityHelsinki
    Period15/03/1518/03/15

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  • Cite this

    Penttilä, S., Betova, I., Bojinov, M., Kinnunen, P., & Toivonen, A. (2015). Oxidation model for construction materials in supercritical water: estimation of kinetic and transport parameters. In Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015) (USB stick ed.). [2064] VTT Technical Research Centre of Finland. VTT Technology, No. 216 https://www.vtt.fi/inf/pdf/technology/2015/T216.pdf