主题：PDC-Derived protective coatings
Despite significant efforts which have been made in the last decade(s) in order to reduce the consumption of fossil resources and to move towards low or no emission energy techniques, combustion engines/machines will still play a major role in the next decades. This is partly due to the expected development of the world energy system until the year 2050. Thus, the total world energy consumption is expected to increase from 10 Gtoe (giga tones of oil equivalent) per year today to 22 Gto per year in 2050, of which fossil fuels (i.e., coal, oil and natural gas) will provide 70% and non-fossil sources (renewable and nuclear energy) 30%. Within this context and considering the limited availability of fossil resources, the development of strategies to increase the efficiency of combustion engines seems to be a logical consequence. As this correlates to a great extent with the firing temperature, serious efforts in developing novel materials with ultrahigh-temperature (UHT) capability have been done recently.
In this presentation, two material classes capable to be operated at ultrahigh temperatures (i.e., T beyond 1500 °C) as well as their potential for the fabrication of thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) will be presented. Firstly, substrate materials based on the Mo-Si-B (molybdenum silicide boride) intermetallic system will be introduced, which exhibit improved UHT behavior with respect to the state-of-the-art Ni-base superalloys. Beside details on their preparation, physical and thermomechanical properties thereof will be presented. Furthermore, the synthesis and the UHT behavior of Si‑Hf‑C‑X-based (X = O, N, B) ceramic nanocomposites will be discussed as novel candidate materials for top coats used in TBC applications in comparison to the zirconia-based state‑of‑the‑art coatings. Information on the processing of the two material classes to produce TBC / EBC systems will be also provided.