Microstructural design and thermal cycling performance of a novel layer-gradient nanostructured Sc2O3–Y2O3 co-stabilized ZrO2 thermal barrier coating

Fan, Wei; Bai, Yu; Wang, Yifan; He, Tao; Gao, Yuan; Zhang, Yi; Zhong, Xia; Li, Binmao; Chang, Zenghu; Ma, Yushan

doi:10.1016/j.jallcom.2020.154525

Cited by 19 publications

(3 citation statements)

References 49 publications

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“…Due to its unique combination of properties ZrO 2 has an important role in the development of several applications: thermal barrier coatings [4], solid oxide fuel cells [5], gas sensors [6] catalysis [7], medical prostheses [8] and storage devices [9]. ZrO 2 , also known as zirconium oxide or zirconium, shows three polymorphic phases, depending on the temperature: monoclinic (m) (T < 1100 °C), tetragonal (t) (T = 1170-2370 °C) and cubic (c) (T = 2370-2706 °C) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Ghiță,

Slobozeanu,

Licu

et al. 2024

Manufacturing Rev.

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Solid oxide fuel cells (SOFC) are electrochemical conversion devices that produces electricity directly from oxidizing a fuel and their development became of high importance to drastically reduce the greenhouse emission. Rare earth elements (REEs) are widely used as materials and dopants in controlling the ionic conductivity of solid electrolytes for SOFCs. Their criticality and high costs for separation to individual REEs lead to first studies aiming to search possible use of mixed REEs with natural occurrence as extracted from concentrates. This paper focused on obtaining sintered pellets based on zirconia doped with natural mixture of REEs extracted from monazite and study their microstructure, impedance spectra and dielectric properties vs. operating temperatures to assess their potential applications as solid electrolyte. ZrO2 doped powders with 8% natural mixture of REEs (8ZrMZ) were synthesized by hydrothermal process. ZrO2 doped with 4% Y2O3 (4ZrY) and 8%Y2O3 (8ZrY) were also obtained by the same route and used as standard materials already used in commercial SOFCs. All powders were uniaxially pressed and sintered in air, with highest densities obtained for 1400 °C. The Niquist diagrams for 8ZrMZ samples show significantly lower ionic conductivity compared to standards 4ZrY and 8 ZrY. This may be attributed to the presence of detrimental Fe and Si impurities following the mixed REE after Th and U removal from monazite concentrates and the ratio of REEs in the dopant composition affecting the ionic conductivity due to possible association of structural defects. Research works are further needed to improve the receipt for using naturally mixed REEs and asses their possible use as a competitive dopant for solid electrolytes.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Ghiță,

Slobozeanu,

Licu

et al. 2024

Manufacturing Rev.

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“…Furthermore, even a small amount of dopants (i.e., nearly or slightly less than 4 mol%) was shown to exert a positive influence on the sintering resistance of the coatings by reducing their surface energy via element segregation. Moreover, the total content of rare earth elements (except Sc 3+ ) should not exceed 5 mol% to prevent the formation of a large number of cubic phases and, consequently, maintain a minimum fracture toughness of the coatings [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth Elements on Stability and Sintering Resistance of Tetragonal Zirconia for Advanced Thermal Barrier Coatings

Che

Liang

et al. 2021

Crystals

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The effect of dopant species on the sintering resistance of zirconia-based ceramics remains a huge challenge in terms of both experiment and theory. As one of the most popular materials for high-temperature protective coatings, it is still urgent to obtain rare earth-doped ZrO2 with high sintering resistance and good phase stability. Here, the sintering resistance and phase stability of rare earth oxides (La2O3, Nd2O3, Gd2O3, and Y2O3)-stabilized zirconia (ZrO2) were thoroughly studied by theoretical and experimental methods. According to experimental data, ZrO2 doped with rare earth ions with larger radii (La3+, Nd3+, and Gd3+) exhibited improved sintering resistance at reduced tetragonal phase stability. Molecular dynamics simulation results revealed that rare earth ions with larger ionic radii are prone to segregation at grain boundaries, which can more effectively reduce the grain boundary energy in the materials under consideration. Therefore, the proposed approach involving doping of NdO1.5 (~1 mol%) and YO1.5 (YbO1.5, 6 mol%) in ZrO2 is considered to be a promising route for the effective preparation of sinter-resistant ZrO2-based ceramics for refractory and thermal barrier materials.

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“…The most common representatives are ZrO 2 and CeO 2 and their solid solutions [1,2]. Compounds structured with fluorite-type cubic symmetry may be tailored to possess a wide range of properties, such as electrical properties, and to withstand high temperatures, high temperature gradients and mechanical stresses, which make them suitable for various technological applications not limited to ion conductors [3,4], thermal barrier coatings [5][6][7], ferroelectrics [8,9] or sensing [10].…”

Section: Introductionmentioning

confidence: 99%

Phase Formation in Heterovalent Equimolar Quinary Oxide Systems of ZrO2-HfO2-CeO2-Nb2O5-RE2O3 Type (RE = Y, Yb, Nd, Gd)

Surdu

Andronescu

2021

Ceramics

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Tailoring electrical and mechanical properties in the fluorite oxides family is of great interest for technological applications. Other than doping and substitution, entropy-driven stabilization is an emerging technique for new solid solutions formation and enhancing or exploring new functionalities. However, there is a high number of possible combinations for higher-order diagram investigations, and the current state of the art shows limited possibilities in predicting phase formation and related properties. In this paper, we expand the compositional space of fluorite oxides in ZrO2-HfO2-CeO2-Nb2O5-RE2O3 systems. X-ray diffractometry and scanning electron microscopy measurements showed the formation of cubic fluorite-type structures when processing compositions at 1600 °C.

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Microstructural design and thermal cycling performance of a novel layer-gradient nanostructured Sc2O3–Y2O3 co-stabilized ZrO2 thermal barrier coating

Cited by 19 publications

References 49 publications

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Hydrothermal synthesis of zirconia doped with naturally mixed rare earths oxides and their electrochemical properties for possible applications in solid oxide fuel cells

Effect of Rare Earth Elements on Stability and Sintering Resistance of Tetragonal Zirconia for Advanced Thermal Barrier Coatings

Phase Formation in Heterovalent Equimolar Quinary Oxide Systems of ZrO2-HfO2-CeO2-Nb2O5-RE2O3 Type (RE = Y, Yb, Nd, Gd)

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