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Higher fracture toughness of tetragonal zirconia ceramics through nanocrystalline structure

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    0328358 - ÚFM 2010 RIV US eng J - Journal Article
    Trunec, M. - Chlup, Zdeněk
    Higher fracture toughness of tetragonal zirconia ceramics through nanocrystalline structure.
    [Vyšší lomová houževnatost tetragonální zirkoniové keramiky díky nanokrystalické struktuře.]
    Scripta Materialia. Roč. 61, č. 1 (2009), s. 56-59. ISSN 1359-6462. E-ISSN 1872-8456
    R&D Projects: GA AV ČR IAA200410502
    Institutional research plan: CEZ:AV0Z20410507
    Keywords : zirconia * nanocrystalline materials * coarsening * toughness * martensitic phase transformation
    Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
    Impact factor: 2.949, year: 2009

    Fracture toughness of nanocrystalline zirconia ceramic stabilized with 1.5 mol.% Y2O3 was measured and compared with fracture toughness of submicrometer-grained zirconia ceramics stabilized with 3 mol.% Y2O3. It was found that nanocrystalline ceramics demonstrated higher fracture toughness than submicrometer-grained zirconia ceramics with both optimized and common grain sizes. The high fracture toughness of nanocrystalline zirconia was confirmed by two different testing methods: indentation method (15.5 MPa m0.5) and chevron notched beam method (7.9 MPa m0.5).

    Lomová houževnatost nanokrystalickéhé zirkoniové keramiky stabilizované 1.5 mol.% Y2O3 byla změřena a porovnána s houževnatostí submikrometrické zirkoniové keramiky stabilizované 3 mol.% Y2O3. Bylo zjištěno, že nanokrystalická keramika vykazovala vyšší lomovou houževnatost než submikrometrická zirkoniová keramika mající optimalizovanou a běžnou velikost zrna. Vyšší lomová houževnatost byla potvrzena dvěmi metodami: indentačně (15.5 MPa m0.5) a metodou chevronového vrubu (7.9 MPa m0.5).
    Permanent Link: http://hdl.handle.net/11104/0174690

     
     
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