CMAS Corrosion Behavior of Mid-Entropy Rare-Earth Hafnate (Y0.3Gd0.3Yb0.4)4Hf3O12 as Thermal Barrier Coating Candidate
High-temperature CMAS corrosion has become a crucial factor inhibiting the further development of thermal barrier coatings (TBCs) because of the increasing service temperature of aero-engines. Herein, a novel mid-entropy rare-earth hafnate (Y<sub>0.3</sub>Gd<sub>0.3</sub>Yb<sub>0.4</sub>)<sub>4</sub>Hf<sub>3</sub>O<sub>12</sub> (YGYbH) was prepared by ultrafast high-temperature sintering (UHS) technology, and its CMAS corrosion behavior and mechanism were investigated. During corrosion, the Ca<sub>2</sub>RE<sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> apatite phase with a lower formation enthalpy and entropy-stabilized effect had a more intense tendency to be generated, which improves the density and stability of the reaction layer, hindering the further penetration of molten CMAS. Moreover, the significant lattice distortion caused by the rare-earth ions with different radii impeded the ionic diffusion, which delayed the CMAS corrosion reaction. In general, YGYbH, with excellent CMAS corrosion resistance, has the potential to serve as a next-generation TBC material.
Authors
- Fuxing Ye (ORCID: https://orcid.org/0000-0002-2096-9631)
- Tianyuan Luo
- Yuan Yao (ORCID: https://orcid.org/0000-0001-9959-4707)
- Fanwei Meng (ORCID: https://orcid.org/0000-0003-2193-7815)
Institutions
- Tianjin University (CN)
Publication Details
- Journal
- Materials
- Published
- 2024-12-01
- DOI
- https://doi.org/10.3390/ma17235892
- Citations
- 3
- Primary Topic
- High-Temperature Coating Behaviors
- Type
- article
- Field-Weighted Citation Impact
- 3.90
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China