Multi-component strategy for remarkable suppression of thermal conductivity in strontium diyttrium oxide: The case of high-entropy Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)2O4 ceramic |
| |
| Affiliation: | 1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;2. Chengdu Holy Industry & Commerce Corp., Ltd. (Group), Chengdu 611937, PR China;3. Guiyang AECC Power Precision Casting Co., LTD, Guiyang 550000, PR China;1. Research Center of Solid Oxide Fuel Cell, China University of Mining & Technology-Beijing, Beijing 100083, China;2. School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST Scotland, UK;1. Research Institute of Aero-Engine, Beihang University, Beijing 100191, China;2. Research Institute for Frontier Science, Beihang University, Beijing 100191, China;3. School of Mechanical Engineering and Automation, Beihang University, China;4. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;1. Departamento de Física de la Materia Condensada, Universidad de Sevilla, 41080 Sevilla, Spain;2. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006 Badajoz, Spain;1. Institute of Structure and Design, German Aerospace Center e.V., Stuttgart, Germany;2. Institute of Aerodynamics and Flow Technology, German Aerospace Center e.V., Cologne, Germany |
| |
| Abstract: | Anti-spinel oxide SrY2O4 has attracted extensive attention as a promising host lattice due to its outstanding high-temperature structural stability and large thermal expansion coefficient (TEC). However, the overhigh thermal conductivity limits its application in the field of thermal barrier coatings. To address this issue, a novel high-entropy Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)2O4 ceramic was designed and synthesized for the first time via the solid-state method. It is found that the thermal conductivity of Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)2O4 is reduced to 1.61 W·m?1·K?1, 53 % lower than that of SrY2O4 (3.44 W·m?1·K?1) at 1500 °C. Furthermore, reasonable TEC (11.53 ×10?6 K?1, 25 °C ～ 1500 °C), excellent phase stability, and improved fracture toughness (1.92 ± 0.04 MPa·m1/2) remained for the high-entropy Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)2O4 ceramic, making it a promising material for next-generation thermal barrier coatings. |
| |
| Keywords: | High-entropy ceramics Reduced thermal conductivity Thermal barrier coatings |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
