Influence of zirconia alloying on the thermophysical and mechanical properties of YTaO4 ceramics

Zong, Ruofei; Wu, Fushuo; Song, Peng; Feng, Jing

doi:10.1016/j.ceramint.2019.07.187

Cited by 13 publications

(5 citation statements)

References 42 publications

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“…The relationship between E and HV can be expressed as E = 63.2 + 9.3HV, indicating that E and HV present a directly proportional relationship [56]. Overall, the above analysis strongly proved that 5RE 2 Zr 2 O 7 had higher E and HV than its counterparts.…”

Section: Mechanical Propertiesmentioning

confidence: 59%

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

Liu

Shi

Geng³

et al. 2022

J Adv Ceram

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The high-entropy rare-earth zirconate ((La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7, 5RE2Zr2O7 HEREZs) ceramics were successfully prepared by a new high-speed positive grinding strategy combined with solid-state reaction method. The microstructure, crystal structure, phase composition, and thermophysical and mechanical properties of the samples were systematically investigated through various methods. Results indicate that the samples have a single-phase defect fluorite-type crystal structure with excellent high-temperature thermal stability. The as-prepared samples also demonstrate low thermal conductivity (0.9–1.72 W·m−1·K−1 at 273–1273 K) and high coefficient of thermal expansion (CTE, 10.9 × 10−6 K−1 at 1273 K), as well as outstanding mechanical properties including large Young’s modulus (E = 186–257 GPa) and high fracture toughness (KIC). Furthermore, the formation possibility of the as-prepared samples was verified through the first-principles calculations, which suggested the feasibility to form the 5RE2Zr2O7 HE-REZs in the thermodynamic direction. Therefore, in view of the excellent multifunctional properties exhibited by the as-prepared 5RE2Zr2O7 HE-REZs, they have great potential applications in next-generation thermal-barrier coatings (TBCs).

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Section: Mechanical Propertiesmentioning

confidence: 59%

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

Liu

Shi

Geng³

et al. 2022

J Adv Ceram

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“…27 Both ZrO 2 and YTaO 4 -based regions have been proposed as candidate TBCs material due to their excellent thermophysical properties, e.g., a low thermal conductivity (1.5-2.0 w.m −1 .k −1 ), compatible thermal expansion coefficient (8.4-11.0 ppm.k −1 ), and low elastic modulus (109-154 GPa). [21][22][23][24][25][28][29][30][31][32] It was demonstrated that the ZrO 2 -based region, i.e. Zr 0.66 Y 0.17 Ta 0.17 O 2 , had a good CMAS resistance.…”

Section: Introductionmentioning

confidence: 99%

ZrO₂‐doped YTaO₄ as potential CMAS‐resistant materials for thermal barrier coatings application

Yao

Shan

et al. 2021

J. Am. Ceram. Soc.

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Thermal barrier coatings (TBCs) are applied on the critical components of gas turbine engine to insulate the thermal conduction and prolong the lifetime of metallic component. [1][2][3] Calcium-magnesium-alumino-silicates (CMAS) corrosion of TBCs has become more critical with the increase in engineoperating temperature. [4][5][6][7] CMAS arises from the volcanic ash, dust, and fine sand in the intake air, which will deposit on the surface of the TBCs during engine operation, finally form a CMAS melt when temperature exceeds the melting point, 1200°C-1250°C. 5,8 For the state-of-the art 7-8 wt% yttria stabilized zirconia (7-8YSZ) TBCs, CMAS melt could rapidly dissolve the YSZ and dispersively reprecipitate yttrialean zirconia at elevated temperature, which directly destroys the microstructural integrity of the top coat. 9,10 Additionally, CMAS melt, driven by the capillary force, 11 will fill the open pores of YSZ top coat at elevated temperature, and coagulate during cooling which severely stiffen the top coat and degrades the strain tolerance of TBCs. 7,[12][13][14] To mitigate the CMAS attack, one promising strategy is to develop new CMAS-resistant TBCs materials. 5 Generally, these materials should have high reactivity with CMAS melt. 5,15 The classical CMAS-resistant thermal barrier oxides are rare earth (RE) zirconates, e.g., RE 2 Zr 2 O 7 and RE 4 Zr 3 O 12 , [16][17][18][19] which can react with CMAS and rapidly precipitate a dense reaction products layer at the reaction front. The formation of dense reaction layer mitigates further CMAS infiltration, therefore exhibits a much better CMAS resistance in RE zirconates compared with 7-8YSZ.

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“…The Y 2 O 3 –Ta 2 O 5 –ZrO 2 system has gained attention as a promising candidate for improved TBCs. The pseudo binary YTaO 4 –ZrO 2 is of particular interest due to reports of high fracture toughness [ 4 , 6 ] paired with lower thermal conductivity [ 5 , 7 ], superior thermal stability [ 4 , 8 ], and improved resistance to corrosion [ 4 , 9 ] compared to YSZ. YTaO 4 is a polymorphous material reported to exhibit two different monoclinic [ 10 , 11 ] as well as two tetragonal structures [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, this was not reproduced by others [ 15 , 17 ]. Whereas the M phase is considered as a potential TBC due to its low thermal conductivity [ 5 , 7 , 18 ] and ferroelastic toughening [ 4 , 6 , 8 ], M’ is of interest as X‑ray phosphor in medical diagnostics because of its shorter Ta–O bonds, which enhance the charge-transfer processes utilized in luminescence [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…There has been significant progress in characterizing the Y 2 O 3 –Ta 2 O 5 –ZrO 2 system. However, studies are almost exclusively performed on sintered bulk samples or powders [ 4 , 5 , 7 , 8 , 15 , 16 , 17 , 18 , 19 , 21 , 22 , 24 , 25 , 26 ]. Physical vapor deposition (PVD) or thermal spraying are commonly employed for depositions of TBCs.…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

et al. 2021

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Y(1−x)/2Ta(1−x)/2ZrxO2 coatings with 0 to 44 mol% ZrO2 were synthesized by sputtering. Phase-pure M’-YTaO4 coatings were obtained at a substrate temperature of 900 °C. Alloying with ZrO2 resulted in the growth of M’ along with t-Zr(Y,Ta)O2 for ≤15 mol%, while for ≥28 mol%, ZrO2 X-ray diffraction (XRD) phase-pure metastable t was formed, which may be caused by small grain sizes and/or kinetic limitations. The former phase region transformed into M’ and M and the latter to an M’ + t and M + t phase region upon annealing to 1300 and 1650 °C, respectively. In addition to M and t, T-YTa(Zr)O4 phase fractions were observed at room temperature for ZrO2 contents ≥28 mol% after annealing to 1650 °C. T phase fractions increased during in situ heating XRD at 80 °C. At 1650 °C, a reaction with the α-Al2O3 substrate resulted in the formation of AlTaO4 and an Al-Ta-Y-O compound.

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Influence of zirconia alloying on the thermophysical and mechanical properties of YTaO4 ceramics

Cited by 13 publications

References 42 publications

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

ZrO₂‐doped YTaO₄ as potential CMAS‐resistant materials for thermal barrier coatings application

Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

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Influence of zirconia alloying on the thermophysical and mechanical properties of YTaO4 ceramics

Cited by 13 publications

References 42 publications

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

ZrO2‐doped YTaO4 as potential CMAS‐resistant materials for thermal barrier coatings application

Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

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ZrO₂‐doped YTaO₄ as potential CMAS‐resistant materials for thermal barrier coatings application