Triple-layered, thick glassy grain boundaries in porous cordierite ceramics

K. Kaneko, N. Honbe, M. Matsumoto, Y. Yasutomi, T. Saitoh, Y. Takigawa

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Mechanical tests and microstructural investigations were performed on porous cordierite ceramics. Four-point bending tests were carried out both in air and in water. It was shown that the mechanical strength was strongly influenced by the experimental conditions. Triple-layered, thick amorphous grain boundaries were observed by high-resolution transmission electron microscopy. The composition of each layer as measured by energy dispersive X-ray spectroscopy was shown to be different. It is concluded that applying an external stress causes water-induced stress corrosion cracking preferentially occurring at the amorphous grain boundaries and at the triple grain junctions. This may have caused the dramatic decrease in the mechanical strength in water compared with that in air.

    Original languageEnglish
    Pages (from-to)597-604
    Number of pages8
    JournalActa Materialia
    Volume50
    Issue number3
    DOIs
    Publication statusPublished - Feb 8 2002

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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