Chapter 61. Effect of Geometry on CVI with RF Heating

  1. Don Bray
  1. Vikas Midha and
  2. Demetre J. Economou

Published Online: 23 MAR 2010

DOI: 10.1002/9780470294499.ch61

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

How to Cite

Midha, V. and Economou, D. J. (1998) Effect of Geometry on CVI with RF Heating, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294499.ch61

Author Information

  1. Plasma Processing Laboratory Department of Chemical Engineering University of Houston Houston, TX 77204–4792

Publication History

  1. Published Online: 23 MAR 2010
  2. Published Print: 1 JAN 1998

ISBN Information

Print ISBN: 9780470375594

Online ISBN: 9780470294499

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Keywords:

  • conservative;
  • porcelain;
  • misapplication;
  • vocabulary;
  • exhilarating

Summary

A comprehensive finite-element model is used to examine the effects of preform and induction-coil geometry on radio-frequency assisted chemical vapor infiltration of carbon preforms. Densification occurs axially in an “inside-out” manner in long cylindrical preforms heated by a helical induction-coil with constant input power. Entrapped porosity is formed in the center of the preform. As the height to diameter ratio of the cylinder is decreased, the densification pattern becomes radial in nature directed from the edges to the center of the preform. Entrapped porosity is then formed near the radial edges of the preform. The densification behavior is also sensitive to the geometry of the induction-heating coil. Schemes for tailoring coil geometry and operating parameters are developed for the densification of conical-shaped carbon preforms.