Corrosion of silicon nitride ceramics under hydrothermal conditions

Tsugio Sato, T. Murakami, T. Endo, M. Shimada, K. Komeya, T. Kameda, M. Komatsu

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    32 Citations (Scopus)

    Abstract

    Corrosion behaviour of Si3N4 ceramics containing Y2O3, Al2O3 and AIN as sintering aids was investigated under hydrothermal conditions at 200-300 ‡C and saturated vapour pressures of water for 1-10 days. Hydrothermal corrosion resulted in the dissolution of the Si3N4 matrix and the formation of a product layer consisting of the original grain-boundary phases and hydrated silica. The dissolution rate of Si3N4 ceramics decreased with decreasing crystallinity of the grain-boundary phase. The dissolution rate could be adequately described by a parabolic plot in the initial stage of the reaction. The apparent activation energies were 83.5-108 kJ mol-1, and the bending strength of the corroded samples decreased from ∼ 600 to 400 MPa in the initial stage of the reaction upto a weight loss of 0.004 g cm-2, and then was almost constant up to a weight loss of 0.012 g cm-2.

    Original languageEnglish
    Pages (from-to)1749-1754
    Number of pages6
    JournalJournal of Materials Science
    Volume26
    Issue number7
    DOIs
    Publication statusPublished - 1991 Jan 1

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials
    • Materials Science(all)

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