In situ generated ß-Yb₂Si₂O₇ environmental barrier coatings to protect non-oxide silicon-based ceramics in gas turbines.

Intro -- 1 Introduction and motivation -- 1.1 Goals -- 2 State of the art -- 2.1 Overview about gas turbines -- 2.2 Non-oxide silicon-based ceramics -- 2.3 Oxidation and hot gas corrosion behavior of Si3N4 -- 2.4 Suitable environmental barrier coating materials -- 2.5 Environmental barrier coatings for Si3N4, SiC and SiC/SiC -- 2.6 Polymer derived ceramics -- 2.7 Synthesis of rare-earth silicates -- 2.8 Preliminary studies: silazane and Yb2O3-based systems -- 3 Experimental procedure -- 3.1 Materials -- 3.2 Composition and preparation of the coating slurries -- 3.3 Processing of powder and monolithic samples -- 3.4 Deposition of the Si/Yb(2:1) coating system -- 3.5 Characterization methods -- 3.6 Résumé -- 4 Results and discussion -- 4.1 Pyrolysis behavior of the Yb(2:1) composite powder -- 4.2 Phase composition and microstructure of the Yb(2:1) monoliths -- 4.3 Oxidation behavior of uncoated Si3N4 substrates -- 4.4 Properties of the Si/Yb(2:1) coating system on Si3N4 -- 4.5 Deposition of thicker Yb(2:1) coatings -- 4.6 Si/Yb(2:1) coating system on SiC/SiC -- 5 Summary -- 6 Outlook -- 7 Zusammenfassung -- 8 References -- 9 Acknowledgements -- 10 Annexes -- 10.1 List of symbols and abbreviation -- 10.2 List of chemical compounds -- 10.3 List of figures -- 10.4 List of tables -- 10.5 Publications -- 10.6 Curriculum Vitae.

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Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2024. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.