第 10 回物質科学談話会
日時：令和元～17:00
日時：令和元年
令和元年 9 月 9 日（月） 15:30～
場所：工学部 5 号館 2 階 523 講義室

Advanced Polymer-Derived (Ultra)-High-Temperature Resistant Ceramic
Nanocomposites for Energy Conversion and Storage
Ralf Riedel
Technische Universität Darmstadt, Department of Materials and Geosciences, Dispersive
Solids Group, Otto-Berndt-Str. 3, 64287 Darmstadt, Germany

Keywords: Energy Conversion, Energy Storage, Polymer-Derived Ceramics, SiOC Ceramics,
SiCN Ceramics

Despite significant efforts, which have been made in the last decade(s) in order to reduce theconsumption 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, thetotal world energy consumption is expected to increase from 10 Gto (giga tons of oilequivalent) per year today to 22 Gto per year in 2050, of which fossil fuels (i.e., coal, oil andnatural gas) will provide 70% and non-fossil sources (renewable and nuclear energy) 30%.
Within this context and considering the limited availability of fossil resources, thedevelopment of strategies to increase the efficiency of combustion engines seems to be alogical consequence. As this correlates largely with the firing temperature, serious efforts indeveloping novel materials with ultrahigh-temperature (UHT) capability have been donerecently.
In this presentation, polymer-derived ceramics capable to be operated at ultrahightemperatures (i.e., T between 1200 and 1400 °C) as well as their potential for the fabricationof thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) will bepresented. Beside details on their preparation, physical and thermomechanical properties
thereof will be presented. Furthermore, the synthesis and the (U)HT behavior of Si Hf C Xbased (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 [1]. Information on the processing of the material classes to produce TBC/EBCsystems will be also provided. Furthermore, novel candidate substrate materials based on
the Mo-Si-B (molybdenum silicide boride) intermetallic system will be introduced, which
exhibit improved (U)HT behavior with respect to the state-of-the-art Ni-base superalloys [2].
A second focus will address the application of polymer-derived ceramics for energy storage
devices in form of novel anode materials for Li-ion batteries [3]. In particular, theelectrochemical behavior of SiOC- and SiCN-based ceramics and composites are discussed.

Reference

1.

E. Ionescu, S. Bernard, R. Lucas, P. Kroll, S. Ushakov, A. Navrotsky, and R. Riedel,
Polymer-Derived Ultra-High Temperature Ceramics (UHTCs) and Related Materials,
Adv. Eng. Mater. 2019, 1900269.

2.

E. Ionescu, H.-J. Kleebe, R. Riedel, “Silicon-containing polymer-derived ceramic
nanocomposites (PDC-NCs): preparative approaches and properties”, Chem. Soc. Rev.
2012, 41, 5032.

3.

M. Heilmaier, M. Krüger, H. Saage, et al., “Current development status of metallicmaterials for structural applications beyond nickel-base superalloys” JOM 2009, 61, 61.

4.

L. M. Reinold, M. Graczyk-Zajac, Y. Gao, G. Mera, R. Riedel, “Carbon-rich SiCN
ceramics as high capacity/high stability anode material for lithium-ion batteries”,
Journal of Power Sources 2013, 236, 224.