Ceramic top coats of plasma-sprayed thermal barrier coatings: materials, processes, and properties

E Bakan, R Vaßen - Journal of Thermal Spray Technology, 2017 - Springer
Journal of Thermal Spray Technology, 2017Springer
The ceramic top coat has a major influence on the performance of the thermal barrier
coating systems (TBCs). Yttria-partially-stabilized zirconia (YSZ) is the top coat material
frequently used, and the major deposition processes of the YSZ top coat are atmospheric
plasma spraying and electron beam physical vapor deposition. Recently, also new thermal
spray processes such as suspension plasma spraying or plasma spray-physical vapor
deposition have been intensively investigated for TBC top coat deposition. These new …
Abstract
The ceramic top coat has a major influence on the performance of the thermal barrier coating systems (TBCs). Yttria-partially-stabilized zirconia (YSZ) is the top coat material frequently used, and the major deposition processes of the YSZ top coat are atmospheric plasma spraying and electron beam physical vapor deposition. Recently, also new thermal spray processes such as suspension plasma spraying or plasma spray-physical vapor deposition have been intensively investigated for TBC top coat deposition. These new processes and particularly the different coating microstructures that can be deposited with them will be reviewed in this article. Furthermore, the properties and the intrinsic–extrinsic degradation mechanisms of the YSZ will be discussed. Following the TBC deposition processes and standard YSZ material, alternative ceramic materials such as perovskites and hexaaluminates will be summarized, while properties of pyrochlores with regard to their crystal structure will be discussed more in detail. The merits of the pyrochlores such as good CMAS resistance as well as their weaknesses, e.g., low fracture toughness, processability issues, will be outlined.
Springer
以上显示的是最相近的搜索结果。 查看全部搜索结果