Synthesis and phase stability of zirconia-lanthania-ytterbia-yttria nanoparticles; a promising advanced TBC material

Keyvani, A.; Mostafavi, N.; Bahamirian, M.; Sina, Hossein; Rabiezadeh, Amin

doi:10.1080/21870764.2020.1743419

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…Fundamental prerequisites for TBCs encompass low thermal conductivity, exceptional thermal stability, compatibility in terms of thermal expansion coefficient with the substrate, and commendable mechanical properties. [3][4][5] Although YSZ remains the most widely employed TBC material, it undergoes a phase transition resulting in coating failure at temperatures surpassing 1200 • C. An exigent demand arises to develop novel thermal barrier coating materials showcasing enhanced high-temperature stability and reduced thermal conductivity, thus, endorsing the choice of rare-earth tantalates as a fresh coating system. [6][7][8] The crystal structure of RE 3 TaO 7 ceramics experiences an ordered-disordered transition attributed to lanthanide contraction.…”

Section: Introductionmentioning

confidence: 99%

“…The integration of thermal barrier coatings (TBCs) can ameliorate the high‐temperature and corrosion resistance of gas turbine blades. Fundamental prerequisites for TBCs encompass low thermal conductivity, exceptional thermal stability, compatibility in terms of thermal expansion coefficient with the substrate, and commendable mechanical properties 3–5 …”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic properties of rare‐earth tantalates enhanced by high entropy design

Liu,

Peng,

Huang

et al. 2024

J Am Ceram Soc.

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Rare‐earth tantalates present promise as thermal barrier coatings due to their favorable thermodynamic characteristics. To further diminish thermal conductivity, three high‐entropy tantalate samples, namely (Ce0.2Nd0.2Sm0.2Eu0.2Lu0.2)3TaO7, (Nd0.2Sm0.2Eu0.2Gd0.2Tm0.2)3TaO7, and (Ce0.2Nd0.2Sm0.2Eu0.2Dy0.2)3TaO7, denoted as HE‐1, HE‐2, and HE‐3, respectively, were synthesized in this investigation. HE‐1 exhibits a low thermal conductivity of 1.46 W/(m·K)–1 at 1000°C. The rationale behind this reduced thermal conductivity is expounded via the phonon scattering mechanism. The introduction of atomic disparities and grain size inhomogeneity, attributable to high‐entropy doping, collaborates to enhance phonon scattering, culminating in the lowest thermal conductivity. HE‐3, on the other hand, possesses a notable thermal expansion coefficient of 11.6 × 10−6 K−1 at 1200°C and manifests pronounced anisotropy in CTEs. All three high‐entropy samples demonstrate commendable mechanical properties, with Young's modulus lower than that of single‐component rare‐earth tantalates, while simultaneously exhibiting high hardness values (>8.4 GPa). This work furnishes a valuable reference for the utilization of high entropy rare‐earth tantalates in the realm of thermal barrier coatings.

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