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Method for producing silicon oxycarbide fiber

Ceramic fibers SiOCCeramic matrix compositesMetal matrix compositesPolymer matrix composites

Introduction

The invention relates to a method for producing silicon oxycarbide fibers by pyrolysis of preceramic precursors. Said method comprises the following steps: spinning of a composition comprising a silicone polymer and a reticulating agent, chemical reticulation of the fibers and pyrolysis at a temperature between 800 and 1400° C in non-oxidizing atmosphere.

Technical features

The new technology relates to a method for producing silicon oxycarbide fibers by pyrolysis of preceramic precursors. Silicon oxycarbides have a structure derived from silica glass in which some of the bridging silicon atoms are replaced by tetracoordinated C atoms. Such substitution leads to improved mechanical properties, higher viscosity and allows to use SiOC at higher temperature compared to the starting silica glass. The method comprises the spinning of a composition comprising a silicone polymer and a reticulating agent, chemical reticulation of the fibers and pyrolysis in non-oxidizing atmosphere. Said method is characterized by the use of a polyorganohydrosiloxane as silicone polymer and by a reticulating agent that carries out reticulation by reacting with Si-H bonds of polyorganohydrosiloxane.

Possible Applications

  • Structural materials;
  • Performance materials;
  • High temperature and aggressive environments.

Advantages

  • SiOC fibers with low cost production;
  • SiOC fibers with high temperature stability;
  • SiOC fibers with high elastic modulus;
  • Alkali-resistant SiOC fibers;
  • Robust process.