| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
Multicomponent Rare-Earth Titanates as a New Thermal Barrier Coating Material |
| Author(s) |
Takafumi Ogawa, Makoto Tanaka, Naoki Kawashima, Taishi Ito, Kei Nakayama, Takeharu Kato, Norio Yamaguchi, Hiroaki Suzuki, Haruo Shibata, Akira Kawasaki, Satoshi Kitaoka |
| On-Site Speaker (Planned) |
Takafumi Ogawa |
| Abstract Scope |
Rare-earth titanates with enriched oxygen vacancies (R2TiO5) have been investigated as candidate materials for thermal barrier coatings (TBCs) in hot-section components of aircraft engines due to their low thermal conductivity and thermal expansion coefficient (CTE) close to YSZ. Meanwhile, multicomponent oxides with a higher configurational entropy have recently attracted much attention because of their ability to modify material properties. In this work, the crystal structures and thermomechanical properties of R2TiO5 with four rare-earth elements have been evaluated to assess its potential as a TBC. In the series, the polymorph is found to change between cubic, hexagonal, and orthorhombic phases, depending on composition. While the thermal conductivity and CTE remain almost unchanged, the radiation property is significantly altered due to f-electron transition levels of rare-earth elements. The effect of radiation-property modification on the thermal barrier performance was assessed by burner-rig tests for R2TiO5-coated YSZ-TBC system prepared by EB-PVD. |