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Highly anti-sintering and toughened pyrochlore (Dy0.2Nd0.2Sm0.2Eu0.2Yb0.2)2Zr2O7 high-entropy ceramic for advanced thermal barrier coatings.
- Source :
-
Ceramics International . Jul2023:Part A, Vol. 49 Issue 14, p23410-23416. 7p. - Publication Year :
- 2023
-
Abstract
- Single-phase high-entropy rare-earth zirconate (Dy 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Yb 0.2) 2 Zr 2 O 7 with excellent high-temperature phase stability at 1600 °C was designed and synthesized. After being heated at 1600 °C for 1 ∼ 50 h, the average grain size of the sample increases only from 0.74 μm to 2.22 μm, indicating a high anti-sintering ability. The fracture toughness is 2.07 ± 0.03 MPa m1/2 (25 °C), which is 50% higher than lanthanum zirconate. The local lattice distortions induced by the atomic interactions and atomic-size mismatch are considered to be responsible for the strong anti-sintering ability and improved fracture toughness. In addition, the thermal expansion coefficient and thermal conductivity of (Dy 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Yb 0.2) 2 Zr 2 O 7 are 10.59 × 10-6 K-1 (25 ∼ 1500 °C) and 1.14 ± 0.09 W·m-1·K-1 (1500 °C), respectively. The outstanding combination of anti-sintering ability, mechanical behavior, and thermophysical properties of (Dy 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Yb 0.2) 2 Zr 2 O 7 highlights its great potential for next-generation thermal barrier coating applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 49
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 164181292
- Full Text :
- https://doi.org/10.1016/j.ceramint.2023.04.173