Toughening and strengthening zirconia through the addition of a transient solid solution additive

A very small amount of nickel oxide (NiO), 0.18 mol%, could dissolve into yttria-stabilized zirconia (YSZ) during sintering in air at elevated temperature. The presence of Ni solutes enhances both the densification and grain growth of YSZ specimens. By heat-treating the NiO-doped YSZ specimen in a r...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-02, Vol.32 (2), p.335-341
Main Authors: Ho, Chang-Ju, Tuan, Wei-Hsing
Format: Article
Language:English
Subjects:
B. Nanocomposites
C. Strength
C. Toughness and toughening
Nanomaterials
Nanostructure
Nickel
Solid solutions
Solution strengthening
Strengthening
Yttria stabilized zirconia
Zirconia
Zirconium dioxide
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Summary:A very small amount of nickel oxide (NiO), 0.18 mol%, could dissolve into yttria-stabilized zirconia (YSZ) during sintering in air at elevated temperature. The presence of Ni solutes enhances both the densification and grain growth of YSZ specimens. By heat-treating the NiO-doped YSZ specimen in a reducing atmosphere, nano-sized Ni particles are produced at the grain boundaries. The NiO thus acts as a transient solid solution additive for the YSZ-Ni nanocomposite. The formation of Ni nano-particles introduces an extra ferromagnetic performance into the YSZ specimen. Furthermore, the toughness and strength of YSZ are enhanced respectively by 120% and 40%. The toughness enhancement shows strong dependence on the size of ZrO 2 grains. Nevertheless, the strengthening is contributed by many factors.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.08.030