Chapter 46. Fabrication and Properties of SiC/SiC Composites Derived from Ceraset™ SN Preceramic Polymer

  1. J. P. Singh
  1. David V. Miller,
  2. Donald L. Pommell and
  3. Gerhard H. Schiroky

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch46

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Miller, D. V., Pommell, D. L. and Schiroky, G. H. (1997) Fabrication and Properties of SiC/SiC Composites Derived from Ceraset™ SN Preceramic Polymer, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch46

Author Information

  1. Lanxide Corporation 1300 Marrows Road, Newark, DE 19714–6077

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • preceramic polymer;
  • silicon carbide;
  • ceramic matrix composites;
  • ceramic grade;
  • resin infhsion

Summary

The fabrication of silicon carbide fiber reinforced silicon carbide matrix (SiC/SiC) ceramic matrix composites (CMCs) by a polymer infiltration and pyrolysis (PIP) technique is discussed. In PIP processing, fiber preforms are infiltrated with a preceramic polymer, which is then cured and pyrolyzed to form a ceramic matrix.1–2 Because the density of a preceramic polymer (ca. 1.0 g/cm3) is usually much lower than that of the pyrolyzed matrix, several preform infiltration and pyrolysis cycles must be performed to increase matrix density. Nicalon™ fiber-reinforced composite plates were fabricated in the as-cured state by (1) vacuum bag/autoclave processing, (2) resin transfer molding, (3) resin infusion of C/SiC preforms, and (4) vacuum assisted resin infusion. Lanxide Corporation's CERASET™ SN preceramic polymer was used in all processing techniques to fabricate the SiC/SiC composites plates.

Plates fabricated by vacuum bag/autoclave processing, resin transfer molding and vacuum assisted resin infusion with carbon coated ceramic grade Nicalon™ fabric resulted in CMCs having average room temperature 4-point flexural strengths of 265 MPa, 275 MPa, and 290 MPa, respectively. The best 4-point flexural strengths, 400 MPa, were achieved via PIP processing to 1000°C of the C/SiC coated ceramic grade Nicalon™ fabric preform. Hi-Nicalon™ fiber-reinforced composite plates were fabricated using infusion of C/SiC preforms at pyrolysis temperatures ranging from 1300°C to 1600°C. The maximum room temperature 4-point flexural strength, 575 MPa, was demonstrated with a plate which was pyrolyzed at 1300°C. The average 4-point flexural strength decreased with increased pyrolysis temperature, presumably due to the degradation of the Hi-Nicalon™ fibers at temperatures greater than 1300°C.