Einfluss von Multiwall Carbon Nanotubes auf die Herstellung und Eigenschaften keramischer SiCN-Fasern (Volume 1) (English shop)

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For about 10 years, research has been conducted at the Chair of Ceramic Materials Engineering at the University of Bayreuth on the production of ceramic SiCN fibres via the precursor route.

For this purpose, the polycarbosilazane ABSE was specially developed; it is synthesised on a pilot-plant scale of 4 kg and, after a thermal and catalytic condensation step, is suitable for melt spinning.

The thermoplastic green fibres thus obtained can, after curing by electron irradiation, be converted into ceramic SiCN fibres by pyrolysis under inert gas. Although fibres can already be produced in this way on a laboratory scale, alternative methods are being sought to improve this process, which reacts very sensitively to the materials and process parameters used, in order to enable production on a technical or industrial scale.

The most important aim of this work was to optimise the rheology of the ABSE precursor for the spinning process by introducing MWCNT. In this way, a cost-effective and reproducible preparation of spinning masses in large quantities is to be ensured, which could not be achieved with the previous methods of catalytic and thermal post-condensation. The focus of the work was therefore on the process side and on clarifying the questions of whether it is technically possible to introduce MWCNT homogeneously into the precursor, and how the presence of the MWCNT affects the further processing steps of spinning, curing and pyrolysis.