Aging strengthening of 8 mol% yttria-fully-stabilized zirconia

Mechanical properties of additively manufactured 8 mol% yttria-stabilized zirconia (8YSZ) parts were extensively studied for the first time. A novel freeform extrusion fabrication process, called Ceramic On-Demand Extrusion (CODE), was employed to deposit an aqueous viscous suspension (~50 vol% solids loading) of fully stabilized zirconia powder in a layer-by-layer fashion. Each layer was exposed to infrared radiation after deposition to attain partial solidification due to drying. Before exposure, the layer was surrounded by oil to preclude nonuniform evaporation, which could cause warpage and crack formation. After the fabrication process was completed, the parts were humid-dried in an environmental chamber and densified by sintering under atmospheric pressure. Standard test methods were employed to examine the properties of sintered parts including density, Vickers hardness, fracture toughness, Young's modulus, and flexural strength. Microstructural evaluation was also performed to observe the

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“…GPa, respectively. This is in agreement with reported values in the literature ranging from 190 to 205 GPa [8,31,34,35].…”

Section: Based On This Calculation Young's Modulus Of Group 3 and 4 supporting

confidence: 93%

Additive manufacturing and mechanical characterization of high density fully stabilized zirconia

Ghazanfari

Leu

et al. 2017

Ceramics International

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“…Considering that the temperature range where the dE/dT was large corresponded with the temperature range where the internal friction peaks were observed, it seems that the deviation between experimental and estimated dynamic Young's modulus by the Wachtman's equation was due to the mechanical damping. The two internal friction peaks with the drastic decrease in the dynamic Young's modulus of 8YSZ below 700 K were also observed by Gao et al [17], Lakki et al [18] and Kondoh et al [19]. Gao et al evaluated the temperature and frequency dependence of the dynamic Young's modulus and the internal friction of yttria-doped zirconia by using a dynamic mechanical analysis [17].…”

Section: Resultsmentioning

confidence: 70%

Influence of Aging on Mechanical Properties of Yttria-Doped Zirconia

et al. 2018

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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.

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“…In particular, 8 mol% Y 2 O 3 -92 mol% ZrO 2 has been widely used for an electrolyte in SOFC because of its high ionic conductivity at an operating temperature about 1000°C. However, it is also well-known that the conductivity of 8YSZ degrades after the long term operation of SOFC [2][3][4][5]. The aging process for stabilized zirconia was first investigated by Carter and Rothfor CaO-ZrO 2 system and it was concluded that defect ordering process was taking place.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coupled Conditions of Thermal Cycle and Dump Environment on Conductivity of 5mol% Yttria Stabilized Zirconia

Xia

Hong

Feng

et al. 2013

KEM

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In some applications such as automotive oxygen sensor, 5mol% Y2O3stabilized zirconia (5YSZ) is generally used because it has both excellent ionic conductivity and mechanical properties. The automotive oxygen sensor would experience a cyclic change from high temperature (engine running) environment to the low temperature damp environment (in the tail pipe when vehicle stops). The conductivity change with coupled conditions of thermal cycle and dump environment in the 5mol%Y2O3ZrO2(5YSZ) system was examined by XRD,Impedance spectroscopy and transmission electron microscopy (SEM) in this paper.

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Aging strengthening of 8 mol% yttria-fully-stabilized zirconia

Cited by 11 publications

References 11 publications

Additive manufacturing and mechanical characterization of high density fully stabilized zirconia

Additive manufacturing and mechanical characterization of high density fully stabilized zirconia

Influence of Aging on Mechanical Properties of Yttria-Doped Zirconia

Effect of Coupled Conditions of Thermal Cycle and Dump Environment on Conductivity of 5mol% Yttria Stabilized Zirconia

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