5. Polyborosilazane-Derived Ceramic Fibers in the Si-B-C-N Quaternary System for High-Temperature Applications

  1. Edgar Lara-Curzio
  1. Samuel Bernard1,
  2. David Cornu1,
  3. Philippe Miele1,
  4. Markus Weinmann2 and
  5. Fritz Aldinger2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291221.ch5

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

How to Cite

Bernard, S., Cornu, D., Miele, P., Weinmann, M. and Aldinger, F. (2005) Polyborosilazane-Derived Ceramic Fibers in the Si-B-C-N Quaternary System for High-Temperature Applications, in Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2 (ed E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291221.ch5

Author Information

  1. 1

    Laboratoire des Multimatériaux et Interfaces (UMR CNRS 5615) University Claude Bernard - Lyon 1 43 Bd du 11 novembre 1918 Villeurbanne, France, 69622

  2. 2

    Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, University Stuttgart, Pulvermetallurgisches Laboratorium Heisenbergstrasse 5, Stuttgart, Germany, 70569

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982329

Online ISBN: 9780470291221

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Keywords:

  • polysilazane;
  • non-oxide ceramic fibers;
  • thermal expansion mismatch;
  • ceramic matrix composites;
  • tensile tests

Summary

Amorphous Si-B-C-N ceramic fibers prepared at 1000°C from a melt-processable boronmodified polysilazane [B(C2H4SiCH3NCH3)3]n were annealed in the temperature range 1000-1800°C in a nitrogen atmosphere to identify the changes in the thermal and structural stability as well as in the related fiber strength. Fibers were shown to be extremely stable up to 1600°C without decomposition and measurable changes in their amorphous structure. At higher temperatures, X-ray diffraction and thermogravimetry analyses indicated that the structural and thermal properties of fibers were probably controlled by the carbothermal decomposition of a minor part of the silicon nitride phase providing Si3N4/SiC nanograins in the material at high temperature. The excellent strength retention after heat-treatment at 1600°C (1.3 GPa) is clearly related to the high structural and thermal stability of fibers. Between 1600°C and 1700°C, the fiber strength decreased to 0.9 GPa then dropped to about one-quarter the original value at 1800°C while structural changes were evident. With an excellent stability in air at 1300°C, these Si-B-C-N fibers are potential candidates for Continuous Fiber-reinforced Ceramic-matrix Composites (CFCCs).