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- Title
Structure, properties and corrosion resistance of high entropy (Y<sub>0.2</sub> Gd<sub>0.2</sub> Dy<sub>0.2</sub> La<sub>0.2</sub>Sm<sub>0.2</sub>) TaO<sub>4</sub> ceramic materials.
- Authors
Wang Ruida; Zhao Shixian; Chen Liugang; Si Yaochen; Li Lingfeng; Li Hongxia; Liu Guanghua; Naihuo Cailiao
- Abstract
In order to meet the urgent demand of new thermal barrier coating materials for a new generation of aero-engines,a high entropy rare earth tantalate (Y0.2Gd0.2Dy0.2La0.2Sm0.2)TaO4 material,abbreviated as (5RE0.2) TaO4, was developed using high-purity oxides (Y2O3, Gd2O3, Dy2O3, Sm2O3, La2O3, Ta2O5) as raw materials according to the stoichiometric ratio, and insulating at 1 200 - 1 750 °C for 5 h for a solid phase reaction. The phase composition, microstructure, thermal properties, mechanical properties, and CMAS (CaO-MgO-Al2O3-SiO2) corrosion resistance of the material were studied. The results show that: (1) the (5RE0.2)TaO4 ceramic material has a monoclinic structure with obvious ferroelastic domain; (2) the material fired at 1 750 °C exhibits extremely low thermal conductivity (1.65 W ⋅ m-1 ⋅ K-1,600 °C) and high thermal expansion coefficient (10.2 x 10-6 K-1,1 200 °C); (3) due to the unique ferroelastic toughening effect,the fracture toughness of the (5RE0.2)TaO4 material fired at 1 750 °C reaches 2.4 MPa ⋅ m12; (4) (5RE0.2)TaO4 reacts with CMAS melt forming a reaction layer, showing excellent corrosion resistance.
- Subjects
CORROSION resistance; SAMARIUM; RARE earth oxides; ENTROPY; THERMAL expansion; CERAMIC materials; THERMAL barrier coatings; FRACTURE toughness; STRENGTH of materials
- Publication
Refractories / Naihuo Cailiao, 2023, Vol 57, Issue 5, p417
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2023.05.009