Thermophysical properties of solution precursor plasma-sprayed La2Ce2O7 thermal barrier coatings

Feng, Bo; Wang, Yi; Jia, Qiang; Huang, Wei; Suo, Hongli; Ma, Wen

doi:10.1007/s12598-019-01286-3

Cited by 17 publications

(5 citation statements)

References 26 publications

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“…Firstly, the thermal expansion coefficient (CTE) of La 2 Ce 2 O 7 (11.21 × 10 −6 K −1 ) is higher than YSZ (11.08 × 10 −6 K −1 ) at 1100 • C [36], and its CTE is close to the MCrAlY BC layer (13-15 × 10 −6 K −1 ) [37], so the La 2 Ce 2 O 7 -YSZ double-layer TBC can match the metal substrate better at high temperature. Secondly, the thermal conductivity of La 2 Ce 2 O 7 is significantly smaller than YSZ [38]. Therefore, the temperature at the TC/BC interface of the La 2 Ce 2 O 7 -YSZ double-layer coating should be much lower than that of the YSZ single-layer coating.…”

Section: Discussionmentioning

confidence: 99%

Solid Particle Erosion Behavior of La2Ce2O7/YSZ Double-Ceramic-Layer and Traditional YSZ Thermal Barrier Coatings at High Temperature

Zhao

Liu

et al. 2022

Coatings

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Thermal barrier coatings (TBC) used for turbine blades are indispensable for the most advanced aero-engines due to their excellent thermal insulation performance. Solid particle erosion (SPE) at high temperatures is one of the most critical factors in TBC failure. The high-temperature SPE failure behavior of TBC on circular sheets and turbine blades was investigated in this paper at erosion angles 60° and 90°. The high-temperature thermal shock behavior of TBC was also studied as the control group. The SPE failure mechanism of TBC is attributed to the spallation and thickness decrease of TBC. The formation of thermally grown oxide is the main reason for the TBC spallation, while the thickness decrease of TBC is due to the impaction of solid particles by near-surface cracking. The erosion angle is critical to the failure behavior of TBC, and TBC is more susceptible to SPE at an erosion angle of 60° than that at 90° because of the additional shear stress. Furthermore, a La2Ce2O7/YSZ double-ceramic-layer TBC was designed and deposited on turbine blades. The experimental results indicate that this type of double-layer TBC has more excellent performance under SPE than traditional YSZ TBC.

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Section: Discussionmentioning

confidence: 99%

Solid Particle Erosion Behavior of La2Ce2O7/YSZ Double-Ceramic-Layer and Traditional YSZ Thermal Barrier Coatings at High Temperature

Zhao

Liu

et al. 2022

Coatings

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“…With fluorite structure mainly, rare-earth cerate has the high temperature stability, higher thermal expansion coefficient, and lower thermal conductivity. Among them, the most concerned La 2 Ce 2 O 7 can achieve very low thermal conductivity of 0.50-0.75 W/(m•K) [92], and can still maintain fluorite structure after heat treatment for a long time at the temperature of 1673 K [93]. The thermal expansion coefficient under the 1473 K can be up to 14 × 10 −6 /K (block), very close to the thermal expansion coefficient of bond coat alloy.…”

Section: A 2 B 2 O 7 Type Compoundsmentioning

confidence: 99%

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Zhao

et al. 2021

Coatings

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Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.

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“…Mullite (3Al 2 O 3 -2SiO 2 ) and alumina (α-phase Al 2 O 3 ) are two promising candidates for TBCs; however, their high thermal conductivity and failure at high temperatures limit their applications. On the other hand, metal-glass composites, perovskite structure oxides (ABO 3 ), magnetoplumbite compounds, and rare-earth materials, including rare-earth zirconates, oxides, tantalate, and silicates, are at the cutting edge of development of superior-performance TBCs [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Structure and Physical Properties of High-Entropy Oxide Coatings Prepared via Atmospheric Plasma Spraying

et al. 2021

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The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol % yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.

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Thermophysical properties of solution precursor plasma-sprayed La2Ce2O7 thermal barrier coatings

Cited by 17 publications

References 26 publications

Solid Particle Erosion Behavior of La2Ce2O7/YSZ Double-Ceramic-Layer and Traditional YSZ Thermal Barrier Coatings at High Temperature

Solid Particle Erosion Behavior of La2Ce2O7/YSZ Double-Ceramic-Layer and Traditional YSZ Thermal Barrier Coatings at High Temperature

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Interfacial Structure and Physical Properties of High-Entropy Oxide Coatings Prepared via Atmospheric Plasma Spraying

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