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    National Tsing Hua University Institutional Repository > 工學院  > 材料科學工程學系 > 期刊論文 >  Mechanical properties and resistance to hydrothermal aging of ceria- and yttria-doped tetragonal zirconia ceramics

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/53130

    Title: Mechanical properties and resistance to hydrothermal aging of ceria- and yttria-doped tetragonal zirconia ceramics
    Authors: Jyung-Dong Lin;Jenq-Gong Duh;Chung-Lun Lo
    教師: 杜正恭
    Date: 2003
    Publisher: Elsevier
    Relation: Materials Chemistry and Physics
    Volume 77, Issue 3, 30 January 2003, Pages 808-818
    Keywords: TZP
    Hydrothermal aging
    Fracture strength
    Low temperature degradation
    Abstract: The relationships among bending strength, compositions, fracture toughness, hardness, and grain size of Ce-Y-TZP ceramics are explored. The addition of YO1.5 enhances the strength of Ce-Y-TZP, yet the effect of CeO2 content on strength is dependent on the yttria amount. It is believed that the effect of ceria and yttria on the strength Ce-Y-TZP is due to the occurrence of deformation plasticity and the variation of grain size. The morphology of fracture surface of Ce-Y-TZP after bending test changes from mostly intergranular fracture into mostly transgranular fracture with the increasing yttria content. The samples which exhibit intergranular fracture usually possess higher toughness and lower fracture strength. After 1000 h hydrothermal aging in water at 200 °C, as the YO1.5 contents in the 5.5 mol% CeO2-TZP and the 8 mol% CeO2-TZP are more than 4 and 2 mol%, respectively, no low temperature degradation is observed on the as-aged surface of Ce-Y-TZP with grain size of 0.7–1.1 mm. According to the present study and previous results in literature, a boundary line to distinguish the stable and unstable t phases is proposed.
    URI: http://www.elsevier.com/
    Appears in Collections:[材料科學工程學系] 期刊論文

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