Structural evolution and thermal conductivities of (Gd1−xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

Wang, Xizhong; Guo, Liu; Zhang, Hai‐Lin; Gong, Shengkai; Guo, Hongbo

doi:10.1016/j.ceramint.2015.06.090

Cited by 56 publications

(10 citation statements)

References 28 publications

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“…Another reason may be that Gd 2 Zr 2 O 7 is fluorite structure due to a small amount of Gd 3+ was substituted by Yb 3+ . According to previous research, in (Gd 1−x Ybx) 2 Zr 2 O 7 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) compounds, materials exhibited fluorite structure when x ≥ 0.08 . In the XRD patterns and Raman spectra of SZYG/YGZO, SZO phase and the second phase Yb 0.5 Zr 0.5 O 1.75 with fluorite structure are present in the as‐synthesized bulk sample, and the content of Yb 0.5 Zr 0.5 O 1.75 phase is 6.1 wt% (Table 3).…”

Section: Resultsmentioning

confidence: 77%

Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Jingxin

Bai

et al. 2020

Int J Applied Ceramic Tech

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Strontium zirconate (SrZrO3) has been considered as a promising thermal barrier coating (TBC) material for application in gas turbine engines; however, the phase transition problem limits its application. In this study, an Yb2O3 and Gd2O3 codoped SrZrO3 system with excellent properties was reported. Yb2O3‐Gd2O3 codoped SrZrO3 ceramic powders [Sr0.8(Zr0.9Yb0.05Gd0.05)O2.75, SZYG/YGZO], [Sr(Zr0.9Yb0.05Gd0.05)O2.95, SZYG] and pure SrZrO3 (SZO) powders were produced by a conventional solid‐state reaction method. The XRD and Raman results show that, the composite SZYG/YGZO ceramics consist of the SZO and Yb0.5Zr0.5O1.75 phases with a low thermal conductivity of ~1.3 W/(m·K) at 1000°C, which is at least 40% lower than that of the SZO ceramics. The TG‐DSC results show that the SZYG/YGZO ceramics have no phase transition in the temperature range of 600 to 1400°C. The thermal expansion coefficient of the SZYG/YGZO ceramics reaches 10.9 × 10−6 K−1 (1250°C). In addition, the fracture toughness of the SZYG/YGZO ceramics increases by more than 30% compared with the SZO ceramics, and this can be attributed to the presence of the Yb0.5Zr0.5O1.75 phase.

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Section: Resultsmentioning

confidence: 77%

Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Jingxin

Bai

et al. 2020

Int J Applied Ceramic Tech

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“…Mobile oxide ions and conductivity have been raised with ZnO addition whereas decreased with Ce 2 O 3 addition. Although doping can improve the thermophysical performance of TBCs, the structural disorder could cause the phase instability [11]. Li et al have investigated the behavior of Yb 2 Zr 2 O 7 ceramic in molten V 2 O 5 and provided a better understanding on Yb 2 Zr 2 O 7 ceramic in the mechanism of thermal exposure and hot corrosion [12].…”

Section: Introductionmentioning

confidence: 99%

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation

He¹,

Huang²,

Hu³

et al. 2020

Mater. Res. Express

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A low-cost and minimal-processing-step method is demonstrated to synthesize Yb 2 O 3 -ZrO 2 system by laser excitation catalyzed solid-state reaction. With 980 nm CW laser irradiating, near-resonant excitation of Yb 3+ ions can obviously enhance solid state reaction. As the molar content of Yb 2 O 3 rises from 12.5% to 50%, the lattice parameter of Yb 2 O 3 -ZrO 2 ceramic increases distinctly. Among them, high crystal quality of Yb 2 Zr 2 O 7 and Yb 0.2 Zr 0.8 O 1.9 are synthesized at the laser power of 400 W for 10 s. Two obvious Raman peaks of Yb 2 Zr 2 O 7 represent increased Raman activity. X-ray photoelectron spectroscopy (XPS) and Impedance spectroscopy demonstrate the huge amount of the oxygen vacancies in Yb 0.2 Zr 0.8 O 1.9 . Yb 2 Zr 2 O 7 shows lowest thermal conductivity among all the ceramics studied, within the range of 0.497-0.730 W mK −1 from 25°C to 1200°C, which indicates a promising thermal barrier material.

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“…The interest on RE 2 B 2 O 7 compounds (where RE = Sc, Y, Ln; B = Ti, Sn, Ce, Zr, Hf) with the pyrochlore structure possessing high melting points and low thermal conductivity values (less than that for yttrium‐stabilized zirconia, YSZ) is associated with their potential applications as thermal barrier coatings (TBC) of gas turbine blades and materials for solid oxide fuel cells . The advantage of these compounds is that they do not have phase changes in a wide temperature range ( T > 1400°C).…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion and heat capacity of Sm₂ScTaO₇ – A promising material for thermal barrier coatings

et al. 2019

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The experimental results presented for Sm 2 ScTaO 7 pyrochlore in this study, temperature dependence of heat capacity and retaining the pyrochlore structure with the temperature variation, as well as the constant value of the thermal expansion coefficient in a wide temperature range, can be considered as evidences for the absence of a previously reported phase transition in the high-temperature region for this compound. This means that Sm 2 ScTaO 7 pyrochlore is no doubt a promising material for thermal barrier coatings. K E Y W O R D S3+/5+ pyrochlores, phase transition, thermal barrier coatings (TBC), thermal expansion, X-ray methods 4416 | GAVRICHEV Et Al.

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Structural evolution and thermal conductivities of (Gd1−xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

Cited by 56 publications

References 28 publications

Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation

Thermal expansion and heat capacity of Sm₂ScTaO₇ – A promising material for thermal barrier coatings

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Structural evolution and thermal conductivities of (Gd1−xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

Cited by 56 publications

References 28 publications

Yb2O3‐Gd2O3 codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Yb2O3‐Gd2O3 codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Thermal barrier materials of Yb2O3-ZrO2 system synthesized by laser excitation

Thermal expansion and heat capacity of Sm2ScTaO7 – A promising material for thermal barrier coatings

Contact Info

Product

Resources

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Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Yb₂O₃‐Gd₂O₃ codoped strontium zirconate composite ceramics for potential thermal barrier coating applications

Thermal barrier materials of Yb₂O₃-ZrO₂ system synthesized by laser excitation

Thermal expansion and heat capacity of Sm₂ScTaO₇ – A promising material for thermal barrier coatings