About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Boosting thermophysical and mechanical properties of rare-Earth zirconates through high-entropy design |
| Author(s) |
Hao Chen, Hao Wang, Chengrui Di, Jianjie Tang, Hao Bai |
| On-Site Speaker (Planned) |
Hao Chen |
| Abstract Scope |
Rare earth zirconates are recognized for their ultra-low thermal conductivity, but their limited thermal expansion and fracture toughness limit their application as thermal barrier coatings. To address this issue, this work proposes a high entropy design strategy to improve thermal, physical, and mechanical performance. A series of materials with different entropy values was synthesized by the molten salt method. XRD analysis confirms that materials with higher entropy values will transform from the ordered pyrochlore phase to the cation-disordered fluorite structure. In addition, lattice distortion caused by high entropy improves material properties. The optimal material (La0.2Gd0.2Er0.2Y0.2Yb0.2)2(Zr0.75Ce0.25)2O7 has a low thermal conductivity of 1.49 W·m-1·K-1, a high average thermal expansion coefficient of 10.97 × 10-6 K-1, a high fracture toughness of 2.239 MPa·m1/2, and excellent sintering resistance. This strategy enhances the performance of zirconates and expands the selection range of aerospace thermal barrier coating materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, High-Temperature Materials |