Synthesis and Phase Stability of Scandia, Gadolinia, and Ytterbia Co-doped Zirconia for Thermal Barrier Coating Application
| Autor: | Li Qilian, Wang Chun, Xiang-Zhong Cui, Yang Weihua, Qian Cao, Li Shuqing |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Scanning electron microscope engineering.material Condensed Matter Physics Microstructure Surfaces Coatings and Films law.invention Thermal barrier coating Coating law visual_art Materials Chemistry engineering visual_art.visual_art_medium Calcination Cubic zirconia Ceramic Composite material Yttria-stabilized zirconia |
| Zdroj: | Journal of Thermal Spray Technology. |
| ISSN: | 1544-1016 1059-9630 |
| DOI: | 10.1007/s11666-014-0158-2 |
| Popis: | Scandia, gadolinia, and ytterbia co-doped zirconia (SGYZ) ceramic powder was synthesized by chemical co-precipitation and calcination processes for application in thermal barrier coatings to promote the durability of gas turbines. The ceramic powder was agglomerated and sintered at 1150 °C for 2 h, and the powder exhibited good flowability and apparent density to be suitable for plasma spraying process. The microstructure, morphology and phase stability of the powder and plasma-sprayed SGYZ coatings were analyzed by means of scanning electron microscope and x-ray diffraction. Thermal conductivity of plasma-sprayed SGYZ coatings was measured. The results indicated that the SGYZ ceramic powder and the coating exhibit excellent stability to retain single non-transformable tetragonal zirconia even after high temperature (1400 °C) exposure for 500 h and do not undergo a tetragonal-to-monoclinic phase transition upon cooling. Furthermore, the plasma-sprayed SGYZ coating also exhibits lower thermal conductivity than yttria stabilized zirconia coating currently used in gas turbine engine industry. SGYZ can be explored as a candidate material of ultra-high temperature thermal barrier coating for advanced gas turbine engines. |
| Databáze: | OpenAIRE |
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