Chapter 24. Properties of RBSN and RBSN-SiC Composites

  1. John B. Wachtman Jr.
  1. A. Lightfoot1,
  2. H. L. Ker1,
  3. J. S. Haggerty1 and
  4. J. E. Ritter2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch24

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Lightfoot, A., Ker, H. L., Haggerty, J. S. and Ritter, J. E. (1990) Properties of RBSN and RBSN-SiC Composites, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch24

Author Information

  1. 1

    Massachusetts Institute of Technology Cambridge, MA 02139

  2. 2

    University of Massachusetts Amherst, MA 01003

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • nitrided composite;
  • microstructural;
  • indentation;
  • modification;
  • mechanical properties

Summary

Strengths, fracture toughnesses, hardnesses, and dimensional changes have been measured for RBSN and RBSN/SiC composites. Samples were made from mixtures of Si and either Si- or C-rich SiC powders. All powders were derived from SiH. Dimensions of the nitrided composites were essentially equal to those of the dies (for RBSN + Si-rich SiC, total change = 0.1 ± 0.05%). For pure, 75% dense RBSN dispersed with octanol, strengths up lo 858 MPa have been achieved. Improved strengths result from a combination of microstructural perfection and increased fracture toughness. Toughnesses were measured by the indentation technique and through fracture mechanics analysis of fracture origins. The mechanical properties of the composites were approximately equal to those of methanol processed RBSN but not quite equal to those of the octanol-processed RBSN. Results are discussed in terms of observed microstructural features.