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Journal of Materials Science

, Volume 43, Issue 12, pp 4042–4049 | Cite as

Processing and magnetic properties of metal-containing SiCN ceramic micro- and nano-composites

  • Ralf Hauser
  • Adel Francis
  • Ralf Theismann
  • Ralf Riedel
Rees Rawlings Festschrift

Abstract

Owing to their excellent high temperature and oxidation resistance, non-oxide polymer-derived silicon-based ceramics are suitable for applications in hot and corrosive environments. The metal (Fe, Co)-containing pre-ceramic compounds combine the processability of organic polymers with the physical and chemical characteristics of the metallic component. In this study, we will introduce two different routes to embed metal particles in a SiCN ceramic matrix, derived from the commercially available polysilazane Ceraset®. (1). Mixing and milling of metal powders (Fe, Co) with pre-crosslinked polysilazane followed by pyrolysis at 1100 °C. (2). Chemical reaction between metal carbonyl compounds, namely Fe(CO)5 and Co2(CO)8, with pure polyorganosilazane followed by pyrolysis at 1100 °C. Both synthetic routes will be discussed on two particular examples, iron- and cobalt-containing samples as well as their resulting different microstructures with respect to their magnetic properties. The phases and microstructures of the metal–SiCN composites were investigated in terms of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with EDX, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and magnetometer. Upon annealing in argon at 1100 °C, the crosslinked polysilazane blended with iron powder possesses a high saturation magnetization of about ∼57 emu/g and exhibits good ferromagnetic behaviour in comparison to the one blended with cobalt. The magnetic measurements were performed within the temperature range 65–300 K.

Keywords

Iron Powder Iron Carbonyl Fe3Si Soft Magnetic Property Metal Carbonyl 

Notes

Acknowledgements

A. F., who spent 2 months at the Technische Universität Darmstadt (TUD) under the sponsorship of the DAAD fellowship programme, acknowledges the support of the DAAD. Furthermore, A. F. is grateful to the Alexander von Humboldt Foundation for the Georg-Forster research fellowship. R.R. extends his gratitude for the financial support of the Fonds der Chemischen Industrie, Frankfurt, Germany.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Ralf Hauser
    • 1
  • Adel Francis
    • 2
  • Ralf Theismann
    • 1
    • 3
  • Ralf Riedel
    • 1
  1. 1.Darmstadt University of TechnologyInstitute of Materials ScienceDarmstadtGermany
  2. 2.Central Metallurgical Research and Development Institute (CMRDI)CairoEgypt
  3. 3.Institute of Nanotechnology, Forschungszentrum KarlsruheKarlsruheGermany

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