Paper Titles
Committee
Preface
Modern Aspects of Ceramic Fiber Development
p.1
A New Generation of Boron-Based Ceramic Fibers: Design, Processing and Properties of SilicoBoron CarboNitride (SiBCN) Fibers from Boron-Modified Polyvinylsilazanes
p.9
Advances in SiC Fibers for High Temperature Applications
p.17
Synthesis of SiCN-Precursors for Fibres and Matrices
p.24
Vibration Damping Properties of Nanotube-Reinforced Materials
p.31
Micromechanics-Based Evaluation of Interfaces in Ceramic Matrix Composites
p.37
The Influence of SiC Nano-Precipitates on the Interface Structure in C/C-SiC Composites
p.46

A New Generation of Boron-Based Ceramic Fibers: Design, Processing and Properties of SilicoBoron CarboNitride (SiBCN) Fibers from Boron-Modified Polyvinylsilazanes

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Abstract:

Boron-modified polyvinylsilazanes have been studied for suitability as fiber precursor. A melt-tractable polymer displaying Si- and N-bonded methyl groups was successfully processed into green fibers ~18μm in diameter via a melt-spinning process. After the shaping process, the use of an ammonia curing atmosphere at 200°C allowed to increase the ceramic yield of the polymer, then avoid inter-fiber fusion during the further increase of the temperature. As-cured fibers were annealed in the temperature range 1000-1800°C in a nitrogen atmosphere to provide SiBCN ceramic fibers black colored, of flexible form and ~12μm in diameter in different crystallinity states going from totally amorphous below 1600°C to well-crystallized at 1800°C. The excellent strength retention after heat-treatment at 1600°C (1.3-1.5GPa) is clearly related to the high amorphous stability of fibers. Elemental compositions of such amorphous fibers showed a typical chemical formula of Si3.0B1.0C5.0N2.4. Between 1600°C and 1700°C, the fiber strength decreased to 0.9GPa then dropped to about one-quarter the original value at 1800°C while structural changes were evident by XRD analysis.

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Periodical:

Advances in Science and Technology (Volume 50)

Pages:

9-16

DOI:

https://doi.org/10.4028/www.scientific.net/AST.50.9

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Online since:

October 2006

Authors:

Samuel Bernard, Markus Weinmann, David Cornu, Philippe Miele

Keywords:

Boron-Modified Polyvinylsilazanes, Curing, Fiber, Melt-Spinning, Pyrolysis, SiBCN

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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