Shape memory phenomena of glass-ceramics and sintered ceramics

Akitoshi Itoh, Yoshiyuki Miwa, Nobuhiro Iguchi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The shape recovery property of some glass ceramics and sintered ceramics has been investigated with high temperature torsion tests. The shape memory phenomena occurred in both β-spodumene glass-ceramics and 2ZnO-B2O3 glass ceramics. This shows that the shape memory phenomenon of ceramics is not caused by the peculiar characteristics of mica crystal. Sintered ceramics such as mica (KMg3AlSi3O10F2), silicon nitride (Si3N4), silicon carbide (SiC), zirconia (ZrO2) and alumina (Al2O3) showed similar phenomenon, indicating that the shape memory phenomenon of ceramics is not limited to glass ceramics generated by a special manufacturing process, but is found in material which contains little glass phase. A correspondence between the temperature range for shape memory and the stress relaxation temperature range was seen in all the materials studied. The critical prestrain, within which 100% shape recovery occurs, is about 0.1% with β-spodumene glass ceramics, silicon nitride and zirconia. This value is 1/5 that of mica glass ceramics.

    Original languageEnglish
    Pages (from-to)117-124
    Number of pages8
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume54
    Issue number1
    Publication statusPublished - 1990 Jan

    ASJC Scopus subject areas

    • Metals and Alloys

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