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Journal of Materials Science

, Volume 42, Issue 3, pp 1004–1009 | Cite as

Preparation and properties of silicon oxycarbide fibers

  • L. F. ChenEmail author
  • Z. H. Cai
  • L. Zhang
  • L. Lan
  • X. J. Chen
  • Jun Zeng
Article

Abstract

Silicon oxycarbide fibers have been prepared from vinyl trimethoxysilane (VTMS) by a modified sol–gel method and with secondary cellulose acetate (SCA) as the fiber-forming aid. Its main advantage over a normal sol–gel fiber processing is that the spinning dope remains spinnable for a long period of time. The effect of the pre-hydrolysis of VTMS on the dope spinnability is studied. At H2O/VTMS = 4, the resultant sol transforms into gel very quickly, unsuitable to obtain a spinnable dope; at H2O/VTMS = 2, too much un-reacted VTMS exists in the sol, making the extruded fiber difficult to solidify; at H2O/VTMS = 3, a dope with good spinnability and stability, and thus high ceramic yield is obtainable. Pyrolysis at 1,000 °C in argon/5% hydrogen results in silicon oxycarbide fibers with the maximum tensile strength (940.0 MPa), moderate Young’s modulus (63.2 GPa) and high carbon content (33.2%).

Keywords

Pyrolysis Silicon Carbide Pyrolysis Temperature High Carbon Content Carbothermal Reduction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The project is sponsored by Natural Science Foundation of China, No. 50472056, and China’s “863 scheme”, No. 2002AA305101. A part of the work was carried out under the supervision of Professor F. L. Riley (School of Materials, University of Leeds, England) and Professor G. C. East (Department of Textile Industries, University of Leeds, England).

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • L. F. Chen
    • 1
    Email author
  • Z. H. Cai
    • 1
  • L. Zhang
    • 1
  • L. Lan
    • 1
  • X. J. Chen
    • 1
  • Jun Zeng
    • 2
  1. 1.Department of Materials Science and Engineering, Advanced Materials LaboratoryXiamen UniversityXiamenChina
  2. 2.Department of Aviation Mechanical EngineeringAir-force and Aviation UniversityChangchunChina

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