|Period:||2020-10-01 to 2022-12- 31|
|Funder:||Federal Ministry of Education and Research (BMBF)|
|Project Manager:||Patrick Hutterer|
|Division:||Materials and Corrosion|
The BMBF NanoMatFutur junior research group MEO-TBCs investigates novel high entropy oxide (multicomponent equiatomic oxide (MEO)) materials with respect to their application as thermal barrier coatings (TBCs). The aim of the project is the development of new, high temperature-stable materials for future high performance TBCs. Such TBCs, for example, protect the metallic structural parts in the hottest zones of aircraft turbines.
Currently used TBCs consist of yttria-stabilized zirconia (YSZ). This material combines a lot of beneficial characteristics which are essential for the use as TBC, e.g. low thermal conductivity, high toughness and high thermocyclic stability. However, in long term use, YSZ is only stable up to 1200 °C. With new, high temperature-stable materials, the operating temperature of aircraft turbines and thus their efficiency could be increased. This means lower fuel consumption and CO2 emissions, making a significant contribution to the conservation of resources and climate protection.
In this context, multicomponent equiatomic oxides (MEOs) are promising candidate materials. They are characterized by the composition of four or more cations in equiatomic concentration and crystalize in a simple, single phase structure. This gives the crystal lattice an exceptionally high configuration entropy, which stabilizes the structure, especially at high temperatures. Furthermore, recent studies suggest promising material properties of MEOs regarding their use as TBC material, e.g. low thermal conductivities and thermal expansion coefficients comparable to YSZ.
In order to investigate the potential of MEOs with regard to the above-mentioned application, ceramics with systematically varied composition are first synthesized and their thermophysical and thermochemical properties will be characterized. At the same time, a reproducible synthesis route for phase pure MEOs will be established. In subsequent PhD projects, the most promising candidates will be further investigated with respect to their mechanical stability, corrosion behaviour and thermocyclic stability. The aim is the industrial implementation of the results by the production of TBCs using current standard techniques.
Dr. Mario Rudolphi
Tel.: +49 69 / 7564-492
P. Hutterer, M. Lepple, Journal of the American Ceramic Society 106 (2023)