Thermal cycling performance of La2Ce2O7/50 vol.% YSZ composite thermal barrier coating with CMAS corrosion

Kang, Y.X.; Bai, Yu; Fan, Wei; Yuan, Tao; Gao, Yuan; Bao, Chao; Li, B.Q.

doi:10.1016/j.jeurceramsoc.2018.02.025

Cited by 48 publications

(13 citation statements)

References 36 publications

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“…22 For Ca 2 RE 8 (SiO 4 ) 6 O 2 apatite, increasing the ionic radius of rare earth (RE) cations will reduce the degradation of molten CMAS, and the ionic radius of La 3+ (0.116 nm) is the largest among lanthanides, while the ionic radius of Ce 4+ is similar. 26 Theoretically, the more La 2 Ce 2 O 7 content is, the better CMAS corrosion performance of the bulks is, which is different from the results of this work. The increase in the corrosion rate of the S7L3 and S3L7 bulks can be attributed to the solid-state diffusion process, which will control the reaction rate after forming a continuous sealing layer between the molten CMAS and the uncorroded bulk, 29 and it is related to the chemical composition of La-Ce apatite crystals in the corrosion layer.…”

Section: Resistance To Cmas Corrosion Of the Sintered (1-x)srzro 3 -X...contrasting

confidence: 96%

“…It is reported that La 2 Ce 2 O 7 has excellent CMAS resistance due to the formation of Ca 2 (La x Ce 1− x ) 8 (SiO 4 ) 6 O 6−4 x grains 22 . For Ca 2 RE 8 (SiO 4 ) 6 O 2 apatite, increasing the ionic radius of rare earth (RE) cations will reduce the degradation of molten CMAS, and the ionic radius of La 3+ (0.116 nm) is the largest among lanthanides, while the ionic radius of Ce 4+ is similar 26 . Theoretically, the more La 2 Ce 2 O 7 content is, the better CMAS corrosion performance of the bulks is, which is different from the results of this work.…”

Section: Discussionmentioning

confidence: 99%

“…If the La content in the CMAS has accumulated to a sufficient amount, it will trigger the crystallization of La-rich glass to form La-containing apatite. 18 La 2 O 3 has higher activity than CeO 2 26 , so La 2 O 3 dissolved into molten CMAS firstly, followed by CeO 2 . Then La-Ce apatite formed due to the incorporation of some Ce 4+ .…”

Section: Corrosion Process Of Cmas On the Sintered (1-x)srzro 3 -Xla ...mentioning

confidence: 99%

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CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics

Liu

et al. 2022

Int J Applied Ceramic Tech

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In this work, the corrosion behavior, interaction products, and the corrosion mechanism of (1‐x)SrZrO3‐xLa2Ce2O7(x = 0.3, S7L3; x = 0.5, S5L5; x = 0.7, S3L7) composite bulks after CaO‐MgO‐Al2O3‐SiO2 (CMAS) attack at 1250°C for 1, 4, and 12 h were investigated, respectively. The molten CMAS and the bulks rapidly interacted and generated a dense reaction layer, which mainly composed of La‐Ce apatite, Ce2Zr2O7.04, ZrO2 with some Ce, Ca, Si, Mg, and Al elements preventing CMAS from continuous penetration effectively. The formation of CMAS self‐crystallizing products such as Ca2Al2SiO7 gehlenite and Mg‐Al spinel with high melting points increased the viscosity of CMAS. The elements in the ceramic also diffused into the molten CMAS and formed Ce2Zr2O7.04 and La2Ce2O7, increasing the melt viscosity and blocking the penetration channel of the molten CMAS. The S5L5 bulk has the best corrosion resistance against CMAS attacks.

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Section: Resistance To Cmas Corrosion Of the Sintered (1-x)srzro 3 -X...contrasting

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Corrosion Process Of Cmas On the Sintered (1-x)srzro 3 -Xla ...mentioning

confidence: 99%

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CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics

Liu

et al. 2022

Int J Applied Ceramic Tech

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“…For example, the widely used Ni‐based alloy substrates exhibit a TECs of 16 × 10 −6 °C −1 , while the TECs of RE 2 Zr 2 O 7 8,12,13 are in the range of 9.0–11.2 × 10 −6 °C −1 , remaining a relatively large difference. Full or partial substitution of Zr with Ce in RE 2 Zr 2 O 7 to form defective fluorite crystalline structure (RE 2 Ce 2 O 7 14–16 ) or pyrochlore and fluorite mixture (La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 ) 17,18 has been proved to be an effective way to improve their TECs. Unfortunately, the thermal contraction in RE 2 Ce 2 O 7 system at the temperature range of 200–400°C is still a challenge for their practical applications 14–20 …”

Section: Introductionmentioning

confidence: 99%

Tuning stoichiometry of high‐entropy oxides for tailorable thermal expansion coefficients and low thermal conductivity

Wang

et al. 2021

J Am Ceram Soc.

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Thermal barrier coating materials with proper thermal expansion coefficient (TEC), low thermal conductivity, and good high-temperature stability are of great significance for their applications in next-generation turbine engines. Herein, we report a new class of high-entropy (La 0.2 Sm 0.2 Er 0.2 Yb 0.2 Y 0.2 ) 2 Ce x O 3+2x with different Ce 4+ contents synthesized by a solid-state reaction method. They exhibit different crystal structures at different Ce 4+ content, including a bixbyite single phase without Ce 4+ doping (x = 0), bixbyitefluorite dual-phase in the RE 2 O 3 -rich region (0 < x < 2), and fluorite single phase in the stoichiometric (x = 2) and CeO 2 -rich region (x > 2). The highentropy (La 0.2 Sm 0.2 Er 0.2 Yb 0.2 Y 0.2 ) 2 Ce x O 3+2x exhibit tailorable TECs at a large range of 9.04 × 10 -6 -13.12 × 10 -6 • C -1 and engineered low thermal conductivity of 1.79-2.63 W⋅m -1 ⋅K -1 . They also possess good sintering resistance and high-temperature phase stability. These results reveal that the high-entropy (La 0.2 Sm 0.2 Er 0.2 Yb 0.2 Y 0.2 ) 2 Ce x O 3+2x are promising candidates for thermal barrier coating materials as well as thermally insulating materials and refractories.

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“…The coating deposited on the substrate surface with aim to enhance the wear resistance, minimize surface degradation via corrosion, thermal cycling etc. The coating material is selected such that the coefficient of thermal expansion of the two materials is mutually compatible [16]. An intermediate metallic bond coat is preferred when the CTE difference between the substrate and the coating is large.…”

Section: Introductionmentioning

confidence: 99%

Thermal Barrier Coatings—A State of the Art Review

et al. 2020

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Thermal barrier coatings (TBCs) have seen considerable advancement since the initial testing and development of thermal spray coating. Thermal barrier coatings are currently been utilized in various engineering areas which include internal combustion engines, gas turbine blades of jet engines, pyrochemical reprocessing units and many more. The development of new materials, deposition techniques is targeted at improving the life of the underlying substrate. Hence, the performance of the coating plays a vital role in improving the life of substrate. The scope for advancement in thermal barrier coatings is very high and continuous efforts are being made to produce improved and durable coatings. Thermal barrier coatings have the potential to address long term and short-term problems in gas turbine, internal combustion and power generation industry. The study of thermal barrier coating material, performance and life estimation is a critical factor that should be understood to introduce any advancement. The present review gives an overview of the thermal spraying techniques and current advancements in materials, mechanical properties, understanding the high temperature performance, residual stress in the coating, understanding the failure mechanisms and life prediction models for coatings.

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Thermal cycling performance of La2Ce2O7/50 vol.% YSZ composite thermal barrier coating with CMAS corrosion

Cited by 48 publications

References 36 publications

CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics

CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics

Tuning stoichiometry of high‐entropy oxides for tailorable thermal expansion coefficients and low thermal conductivity

Thermal Barrier Coatings—A State of the Art Review

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Thermal cycling performance of La2Ce2O7/50 vol.% YSZ composite thermal barrier coating with CMAS corrosion

Cited by 48 publications

References 36 publications

CaO‐MgO‐Al2O3‐SiO2 corrosion behavior of SrZrO3‐La2Ce2O7 composite ceramics

CaO‐MgO‐Al2O3‐SiO2 corrosion behavior of SrZrO3‐La2Ce2O7 composite ceramics

Tuning stoichiometry of high‐entropy oxides for tailorable thermal expansion coefficients and low thermal conductivity

Thermal Barrier Coatings—A State of the Art Review

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Product

Resources

About

Thermal cycling performance of La2Ce2O7/50 vol.% YSZ composite thermal barrier coating with CMAS corrosion

CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics

CaO‐MgO‐Al₂O₃‐SiO₂ corrosion behavior of SrZrO₃‐La₂Ce₂O₇ composite ceramics