Preparation of ceramic coatings based on ultrahigh-temperature ceramic nanocomposites (UHTC-NCs) from precursors

Samuel Aeneas Kredel M.Sc. (1^st cohort)
Anggie Daniela Camacho Ramirez M.Sc. (2^nd cohort)

Supervisors: PD Dr. Emanuel Ionescu, PD Mathias Galetz

In the frame of the RTG 2561, Project 2 is responsible for the preparation of ceramic top coats that allow further pushing the operation temperature, thereby increasing turbine efficiency.

The second cohort of Project P2 (P2.2) focuses on advancing the development of thick environmental barrier coatings (EBCs) with thicknesses ≥ 10 μm. This stage aims to further optimize the fast multilayer processing route by reducing processing time while ensuring high reproducibility and enabling rapid deposition of crack-free polymer-derived ceramic (PDC) coatings. 

In parallel, P2.2 will investigate novel materials compositions through precursor modification using elements such as Al, Hf, Ta, Yb or Y to produce dense, crack-free coatings in close collaboration with project P1. Furthermore, comprehensive oxidation and interdiffusion studies will be carried out on thick EBCs applied to pack-cemented MoSiTi and CrMoSi substrates using both powder and monolithic reference samples in partnership with P1, P3, P5, P7, P8, P9, and P12. 

Mechanical characterization, performed before and after oxidation in collaboration with P6 and P10, will complement these efforts and contribute to a comprehensive understanding of coating performance and long-term durability. 

The third cohort, P2.3, will build on these results by focusing on the development of thick thermal barrier coatings (TBCs > 100 μm) and the integration of complete EBC/TBC systems on oxidation-resistant intermetallic substrates stable above 1200  °C. Efforts will center on optimizing filler design, processing strategies, and high-temperature performance to achieve low thermal conductivity and high durability, in close collaboration with partner projects.