About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Preceramic Polymers; Synthesis, Processing, Modeling, and Derived Ceramics
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Presentation Title |
Superparamagnetic Silicon Carbonitride Ceramic Fibers through In-situ Generation of Iron Silicide Nanoparticles |
Author(s) |
Guenter Motz, Antoine Viard, Birgit Weber, Samuel Bernard |
On-Site Speaker (Planned) |
Guenter Motz |
Abstract Scope |
Non-oxide ceramic fibers are sophisticated, key structural components with superior mechanical and thermal properties. Most of the applications are safety-relevant components, whose damage is difficult to detect. Furthermore, it would benefit to include functional properties in addition to structural aspects. Hence, we developed novel functional superparamagnetic, iron-containing SiCN ceramic fibers derived from an iron-modified, meltable polysilazane via melt-spinning, curing and pyrolysis at 1000 °C. Tensile strength values of 1.24 GPa were measured for fibers with diameters up to 40 µm. Despite a slightly reduced oxidation stability, these ceramic fibers are suitable for structural applications. Transmission electron microscopy confirms the formation of nano-crystalline FeSi, Fe3Si, and Fe particles with a size up to 7.5 nm. Due to the well distributed iron-containing nanoparticles, the ceramic fibers exhibit superparamagnetic behavior for temperatures higher than 26 K with a saturation magnetization of 1.54 emu∙g-1 at 300 K. |