18.01.2006

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3. Phase

Polymer-derived SiCO/HfO2 and SiCN/HfO2 ceramic nanocomposites for

ultrahightemperature applications

 

Dr. Emanuel Ionescu

Technische Universität Darmstadt

Fachbereich 11 - Material- und Geowissenschaften

Darmstadt

 

gemeinsam mit:

Professor Dr. Ralf Riedel

Technische Universität Darmstadt

Fachbereich 11 - Material- und Geowissenschaften

Darmstadt

 

Professor Dr. Hans-Joachim Kleebe

Technische Universität Darmstadt

Fachbereich 11 Material- und Geowissenschaften

Institut für Angewandte Geowissenschaften

Darmstadt

 

Zusammenfassung

 

In this research proposal continuative studies on the preparation of novel SiCO/HfO2 and SiCN/HfO2 ceramic nanocomposites with tailored composition and microstructure for potential (ultra)high-temperature applications will be performed.

Two major goals will be addressed: First, the results obtained throughout the first period of the project will be utilized as input to optimize the homogeneity and microstructure of the target bulk ceramic nanocomposites to improve their high-temperature performance.

Second, SiCN/HfO2 and SiCN/HfO2-based ceramic coatings will be prepared and investigated with respect to their high-temperature behaviour. Investigations on the cross-linking and pyrolysis of the coatings will be performed, followed by studies on the micro/nanostructure formation at temperatures up to 1600°C. The high-temperature microstructures of the coatings (phase composition, precipitate size, distribution and stability) will be compared to those of the bulk ceramic nanocomposites.

Processing optimization as well as chemical composition and microstructure analysis is expected to yield an understanding in which way the incorporation of hafnia into SiCO and SiCN ceramic matrices affects their high-temperature structure/properties.

 

 

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