Thermal conductivity and expansion coefficient of Ln2LaTaO7 (Ln=Er and Yb) oxides for thermal barrier coating applications

Chen, Xiaoge; Tang, An; Zhang, Hongsong; Yanxu, Liu; Zhang, Haoming; Yongde, Zhao

doi:10.1016/j.ceramint.2016.05.141

Cited by 34 publications

(10 citation statements)

References 29 publications

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“…The as-synthesized lump was ground into powder to study its properties. Figure 2( [20,21]. These well-defined peaks of all synthesized specimens clearly indicate their good crystallinity.…”

Section: Phases and Structures Of Yb 2 O 3 -Zro 2 Systemmentioning

confidence: 72%

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 as-synthesized lump was ground into powder to study its properties. Figure 2( [20,21]. These well-defined peaks of all synthesized specimens clearly indicate their good crystallinity.…”

Section: Phases and Structures Of Yb 2 O 3 -Zro 2 Systemmentioning

confidence: 72%

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

He¹,

Huang²,

Hu³

et al. 2020

Mater. Res. Express

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“…Therefore, the need of advanced gas turbines operating at +1500°C drove the newer research for more efficient ceramics showing higher compatibility with bond-coat, high temperature structural stability and lower thermal conductivity. The ceramics with perovskite and pyrochlore crystal structure have earned great attention for advanced TBC applications due to their higher melting point, high temperature structural stability (up to melting point of substrate) and low thermal conductivity [8][9][10][11][12][13][14][15][16][17][18][19]. In the present study, the thermal conductivity of the standard 8% yttria stabilized zirconia (YSZ) and three advanced ceramic materials with perovskite and pyrochloretype crystal structurehave been determined using differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

Thermo-Physical Properties Measurement of Advanced TBC Materials with Pyrochlore and Perovskite Structures

Ejaz

Ali

Ahmad

et al. 2018

KEM

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Thermal barrier coatings (TBCs) serve as thermal insulator in the hot region of an aircraft engine. Besides this, it also protects the underlying metal surface from the harsh corrosive and eroding environment. The associated lower thermal conductivity of TBC ceramic materials plays an important role in the improvement of thermal efficiency of the engine in term of increased combustion temperature and power. The thermal conductivity of the conventional yttria stabilized zirconia (YSZ) and three advanced ceramic materials with perovskite (CaZrO3) and pyrochlore structure (La0.75Nd0.25)2Zr2O7 & Nd2Ce2O7) have been determined using differential scanning calorimetry (DSC). With thin metallic disk on the ceramic samples of different heights were heated / scanned using a standard DSC apparatus. The results were evaluated for the thermal conductivity measurement using well established procedure /calculations. The analyzed results were compared with that of other techniques given by other researchers and found to be in good agreement with an error of 10-15%. The result of coefficient of thermal expansion (CTE) that was measured using a dilatometer up to 1273°K has also given.

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“…The TBC materials with cubic pyrochlore and fluorite type crystal structure have attained great consideration for advanced TBC applications because of their high temperature stability and low thermal conductivity . The thermal conductivities of pyrochlore type lanthanide zirconate L 2 Zr 2 O 7 (where L is La, Nd, Sm, Eu, Er, Gd, Dy, Yb, etc.)…”

Section: Introductionmentioning

confidence: 99%

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

Ejaz

Ali

Ahmed

et al. 2018

Int J Applied Ceramic Tech

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Neodymium cerate (Nd2Ce2O7) was laboratory synthesized by solid‐state reactions of neodymia and ceria and spray dried to get the feedstock for plasma spraying. Hot corrosion behavior of air plasma sprayed 10% Nd2Ce2O7/yttria stabilized zirconia (YSZ) topcoat was studied in the presence of V2O5 and Na2SO4 salts at 950°C for 10‐60 hours. It was observed that due to the presence of relatively higher basic compounds Nd2O3 and CeO2 (form Nd2Ce2O7) than Y2O3 in YSZ changed the reaction dynamics during hot corrosion and the major part of corrosive (NaVO3) was consumed by Nd of Nd2Ce2O7, making NdVO4. The Y2O3 of YSZ contributed in the corrosive reaction partially, relieving majority tetragonal zirconia (t‐ZrO2) in topcoat (YSZ). No remarkable cracking was developed in the topcoat even after 60 hours of accelerated hot corrosion, which was attributed to the retention of in‐relief t‐ZrO2 in YSZ.

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Thermal conductivity and expansion coefficient of Ln2LaTaO7 (Ln=Er and Yb) oxides for thermal barrier coating applications

Cited by 34 publications

References 29 publications

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

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

Thermo-Physical Properties Measurement of Advanced TBC Materials with Pyrochlore and Perovskite Structures

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

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Thermal conductivity and expansion coefficient of Ln2LaTaO7 (Ln=Er and Yb) oxides for thermal barrier coating applications

Cited by 34 publications

References 29 publications

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

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

Thermo-Physical Properties Measurement of Advanced TBC Materials with Pyrochlore and Perovskite Structures

Sulfate‐vanadate hot corrosion of neodymium cerate/yttria stabilized zirconia composite coating

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

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