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Lecture

Single-Source-Precursor Synthesis and Properties of Hf-Containing Ultrahigh-Temperature Ceramic Nanocomposites (UHTC-NCs)

Thursday (29.09.2016)
12:15 - 12:30
Part of:


Polymer-derived ceramic nanocomposites (PDC-NCs) can be synthesized via thermal conversion of suitable single-source precursors, leading in a first step to amorphous single-phase ceramics, which subsequently undergo phase separation processes to furnish bi- or multiphase ceramic nanocomposites. PDC-NCs have been shown to be excellent candidate materials suitable for applications at ultrahigh-temperatures and under harsh environments. In the present work, amorphous SiHfCN- and SiHfBCN-based materials were synthesized via cross-linking and ceramization of tailor-made single-source precursors. High-temperature annealing of the obtained amorphous ceramics led to UHTC-NCs with promising compositions, such as SiC/HfC, HfN/Si3N4/SiBCN or HfC/HfB2/SiC. The presented results emphasize a convenient preparative approach to nano-structured ultrahigh-temperature stable materials starting from greatly compliant single-source precursors. Additionally, recent results concerning the stability of the prepared UHTC-NCs in ultraharsh environments (i.e., oxidative atmosphere, combustion atmosphere, hydrothermal environment) will be presented and discussed.

Speaker:
Dr. Emanuel Ionescu
Darmstadt University of Technology
Additional Authors:
  • Prof. Dr. Ralf Riedel
    Darmstadt University of Technology