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Ceramics 2018, 1(2), 287-303; https://doi.org/10.3390/ceramics1020023

Influence of Aging on Mechanical Properties of Yttria-Doped Zirconia

1
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
2
Graduate School of Environmental Studies, Tohoku University, 6-6-01, Aramaki Aoba Aoba-ku, Sendai, Miyagi 980-8579, Japan
Current address: Tokyo Gas Co., Ltd., 1-7-7, Suehirocho, Tsurumi-ku, Yokohama 230-0045, Japan.
*
Author to whom correspondence should be addressed.
Received: 1 September 2018 / Revised: 25 September 2018 / Accepted: 9 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Functional Ceramics for Energy Applications)
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Abstract

We evaluated the influence of aging on mechanical properties of 8% yttria-doped zirconia (8YSZ) from room temperature to 1200 K. The temperature dependence of the dynamic Young’s and shear moduli of 8YSZ with and without the aging treatment was investigated by using a resonance method. The dynamic Young’s and shear moduli of 8YSZ without the aging treatment decreased by 33% below 700 K and gradually increased at higher temperatures with increasing temperature. On the other hand, those with the aging treatments decreased by around 20% below 600 K while did not significantly change above 600 K with increasing temperature. These demonstrated the effect of aging on the dynamic Young’s and shear moduli of 8YSZ was most remarkable at intermediate temperatures (600~1000 K). Although it was suggested that the existence ratio of the metastable tetragonal phase was increased during the aging treatment, it is likely that the influence of this phase transition on the dynamic Young’s and shear moduli was not significant. It seemed that the difference in the dynamic Young’s and shear moduli of 8YSZ with and without the aging treatment at intermediate temperatures was due to the local ordering of the oxygen vacancies. View Full-Text
Keywords: Yittria-doped zirconia; Aging; Mechanical properties Yittria-doped zirconia; Aging; Mechanical properties
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Kimura, Y.; Kushi, T.; Unemoto, A.; Amezawa, K.; Kawada, T. Influence of Aging on Mechanical Properties of Yttria-Doped Zirconia. Ceramics 2018, 1, 287-303.

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