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Tougher zirconia nanoceramics with less yttria
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 52019 (English)In: Advances in Applied Ceramics: Structural, Functional and Bioceramics, ISSN 1743-6753, E-ISSN 1743-6761, Vol. 118, no 1-2, p. 9-15Article in journal (Refereed) Published
Abstract [en]

Reducing the grain size in zirconia ceramics has shown to decrease its toughness by size-dependent stabilisation of the tetragonal phase that, in turn, hinders the stress-induced phase transformation from tetragonal to monoclinic. The stability of the tetragonal phase increases with the decrease of grain size but decreases with the reduction of the amount of yttria added, implying the need for adjustment of the yttria content when a nano-grained structure is of concern. In this study, low-yttria compositions were investigated. The ceramics were prepared with two sintering methods namely spark plasma sintering (SPS) and pressureless sintering. A clear tendency was noted for the indentation toughness increase with the reduction of yttria content, and a higher toughness achieved in as-SPSed samples in comparison with the annealed samples. The origins of the increased toughness were discussed in terms of yttria content, carbon contamination and increased oxygen vacancies after sintering at reducing atmosphere in SPS.

Place, publisher, year, edition, pages
2019. Vol. 118, no 1-2, p. 9-15
Keywords [en]
Yttria-stabilised zirconia, nanoceramics, phase transformation, transformation toughening, carbon, oxygen vacancy
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-168420DOI: 10.1080/17436753.2018.1445464ISI: 000462544900003OAI: oai:DiVA.org:su-168420DiVA, id: diva2:1319109
Available from: 2019-05-29 Created: 2019-05-29 Last updated: 2019-05-29Bibliographically approved

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Zou, JiZhong, YuanEriksson, MirvaLiu, LeifengShen, Zhijian
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