Mikrostrukturierte Katalysatoren und Sensoren auf Basis von Polymer-abgeleiteten Keramiken
Zusammenfassung der Projektergebnisse
In the course of the present project, a broad range of materials formulations based on polymerderived ceramic nanocomposites was prepared, structurally characterized and assessed with respect to specific functional properties. Typically, the prepared ceramic nanocomposites consist of an amorphous or (partly) nanocrystalline matrix (e.g. SiC, SiOC, SiCN, SiN(O)), embedding homogeneously dispersed and nanostructured secondary phases with functional properties such as magnetic properties or catalytic activity processes such as thermal cracking or oxidation processes. The synthesized nanocomposites were extensively investigated concerning their chemical and phase composition, their microstructure as well as their hightemperature evolution and behavior. Moreover, various processing methods were addressed in order to generate controlled/controllable porosity & specific surface area in selected ceramic nanocomposite systems. Also, the high-temperature evolution of the porosity in the investigated materials was assessed and selected materials with outstanding hightemperature robustness (concerning microstructure and porosity & specific surface area) were highlighted. A second focus of the present project lied on the processing of complex-shaped and miniaturized parts based on the polymer-derived ceramic nanocomposites developed in the project. Thus, defect-free miniaturized 3D ceramic structures were produced within the frame of the project by means of VAT photopolymerization of preceramic polymers with customized photosensitive behavior. Significant effort was done in order to optimize preceramic polymer formulations with suitable photo-polymerization capability and ceramization behavior. Within this context, thiol-ene click reactions were used in order to provide a fast response of the preceramic polymer. The additive manufacturing procedures developed in the present project allowed to produce crack-free miniaturized ceramic parts composed of silicon oxycarbide and silicon carbonitride with complex shapes ranging from cellular lattices to bulk structures, with excellent resolution and very smooth, pore free surfaces.
Projektbezogene Publikationen (Auswahl)
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Single-sourceprecursor synthesis of novel V8C7/SiC(O)-based ceramic nanocomposites, J. Eur. Ceram. Soc. 36 (2016) 3553-3563
S. Kaur, G. Cherkashinin, C. Fasel, H.-J. Kleebe, E. Ionescu, R. Riedel
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Significant Improvement of the Short-Term Oxidation Resistance of Dense HfC/SiC Ceramic Nanocomposites upon Incorporation of Ta, Corr. Sci. 145 (2018) 191-198
Q. Wen, R. Riedel, E. Ionescu
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Additive Manufacturing of Ceramics from Preceramic Polymers: A Versatile Stereolithographic Approach Assisted by Thiol-Ene Click Chemistry, Additive Manufacturing 27 (2019) 80-90
X. Wang, F. Schmidt, D. Hanaor, P. H. Kamm, S. Li, A. Gurlo
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Fabrication of polymer-derived ceramics with hierarchical porosities by freeze casting assisted by thiol-ene click chemistry and HF etching, J. Eur. Ceram. Soc. 40 (2019) 315-323
X. Wang, F. Schmidt, A. Gurlo
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Metal-Catalyst-Free Access to Multiwall Carbon Nanotubes/Silica Nanocomposites (MWCNT/SiO2) from a Single-Source Precursor, Dalton Trans. 48 (2019) 11018
G. Mera, P. Kroll, I. Ponomarev, J. Chen, K. Morita, M. Liesegang, E. Ionescu, A. Navrotsky
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Polymer Derived Ceramics in Encyclopedia of Inorganic and Bioinorganic Chemistry 2019
G. Mera, E. Ionescu
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Polymer-derived ultrahigh temperature ceramics (UHTCs) and related materials, Adv. Eng. Mater. 21 (2019) 1900269
E. Ionescu, S. Bernard, R. Lucas, P. Kroll, A. Navrotsky, R. Riedel
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Polymer-Derived SiOC Integrated with a Graphene Aerogel As a Highly Stable Li-Ion Battery Anode, ACS Applied Materials & Interfaces 12 (2020) 46045-46056
G. Shao, D. Hanaor, J. Wang, D. Kober, S. Li, X. Wang, X. Shen, M. Bekheet, A. Gurlo
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Single-source-precursor synthesis and high-temperature evolution of novel mesoporous SiVN(O)-based ceramic nanocomposites, J. Eur. Ceram. Soc. 40 (2020), 6280-6287
C. Zhou, A. Ott, R. Ishikawa, Y. Ikuhara, R. Riedel, E. Ionescu
