Improved properties of scandia and yttria co-doped zirconia as a potential thermal barrier material for high temperature applications

Fan, Wei; Wang, Z.Z.; Bai, Yu; Che, Junwei; Wang, R.J.; Wei, Tao; Liang, Gongying

doi:10.1016/j.jeurceramsoc.2018.06.002

Cited by 64 publications

(16 citation statements)

References 41 publications

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“…Metal oxides are commonly used as host materials, and zirconia (ZrO 2 ) has various valuable physicochemical properties, such as hardness, high refractive index, high chemical stability, high dielectric constant (k ~ 20), and a wide band‐gap (5.16–7.8 eV) . It has been widely used in optical devices, sensors, high temperature coatings, and high‐temperature electrochemical systems, and its low phonon energy (470 cm −1 ) means that it is potentially an excellent matrix for luminescence, because a low phonon energy results in low nonradiative transitions and enhanced luminescence efficiency …”

Section: Introductionmentioning

confidence: 99%

Preparation and optical properties of samaria‐doped yttria‐stabilized zirconia single crystals

Tan

Wang

et al. 2019

J Am Ceram Soc

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Single crystals of yttria‐stabilized zirconia (YSZ) doped with various concentrations of Sm2O3 were synthesized by the optical floating zone method, and their structure and spectroscopic properties characterized using powder X‐ray diffraction (XRD), optical absorption, and luminescence measurements. XRD showed that the cubic phase of ZrO2 was stabilized by addition of Y2O3 and a series of absorption peaks characteristic of Sm3+ was detected by UV‐visible absorption spectroscopy. Three phenomenological J‐O oscillator strength parameters Ωt (t = 2, 4, 6) were calculated to evaluate the local structure and bonding in the vicinity of the Sm3+ for the 0.75 mol% Sm2O3: YSZ sample. These were in order of Ω2 < Ω4 < Ω6 with values of Ω2 = 5.46 × 10−20 cm2, Ω4 = 10.70 × 10−20 cm2, and Ω6 = 12.67 × 10−20 cm2, and indicate a relatively high symmetry and low covalent character for the Sm‐O bond at the Sm3+ sites in the YSZ matrix. Photoluminescence spectra recorded under an excitation of 404 nm showed four emission bands centered at 571 nm, 621 nm, 652 nm, and 716 nm corresponding to the transitions 4G5/2→6Hj (j = 5/2, 7/2, 9/2, 11/2). The transition probability, lifetime, and branching ratio obtained from the emission spectrum of the 0.75 mol% Sm2O3: YSZ crystal showed that YSZ is a potential host for Sm3+ to achieve a reddish‐orange laser output, and the Sm3+‐modified YSZ crystals have a possible use in reddish‐orange laser and lighting devices.

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Section: Introductionmentioning

confidence: 99%

Preparation and optical properties of samaria‐doped yttria‐stabilized zirconia single crystals

Tan

Wang

et al. 2019

J Am Ceram Soc

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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 κ of some typical TBC materials is listed in Table 1 [12]. It can be seen that Sm 2 Zr 2 O 7 , Yb 2 Zr 2 O 7 and La 2 Zr 2 O 7 have lower κ values than YSZ [13,14]. What is more, the quaternary compounds, such as (Sm 1/2 Yb 1/2 ) 2 Zr 2 O 7 and (La 1/2 Yb 1/2 ) 2 Zr 2 O 7 , have much lower κ than the ternary compound [15].…”

Section: Introductionmentioning

confidence: 99%

Research on Thermal Stability and Properties of Ca3ZrSi2O9 as Potential T/EBC Materials

et al. 2021

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In this study, a new coating material for thermal barrier coating (TBC) or environment barrier coating (EBC) application, Ca3ZrSi2O9 (CZSO), was synthesized and prepared by atmospheric plasma spray (APS) technology. The evolution of the phases and microstructures of the coatings with different thermal-aged were characterized by XRD, XRF, EDS and SEM, respectively. The thermal stability was measured by TG-DTA and DSC. The mechanical and thermal properties, including Vickers hardness (HV), fracture toughness (KIC), thermal conductivity () and coefficient of thermal expansion (CTE) were focused on. It was found that the as-sprayed CZSO coating contained amorphous phase. Crystalline transformation happened at 900–960 ∘C and no mass changes took place from room temperature (RT) to 1300 ∘C. The phenomena of microcrack self-healing and composition uniformity were observed during thermal aging. The of coating was very low at about 0.57–0.80 Wm−1K−1 in 200–1200 ∘C. The combined properties indicated that the CZSO coating might be a potential T/EBC material.

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Improved properties of scandia and yttria co-doped zirconia as a potential thermal barrier material for high temperature applications

Cited by 64 publications

References 41 publications

Preparation and optical properties of samaria‐doped yttria‐stabilized zirconia single crystals

Preparation and optical properties of samaria‐doped yttria‐stabilized zirconia single crystals

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

Research on Thermal Stability and Properties of Ca3ZrSi2O9 as Potential T/EBC Materials

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