Chapter 79. Tensile Tests of Miniature Fiber Reinforced Ceramic Composites for Screening Process-Property Relations

  1. J. P. Singh
  1. S. T. Gonczy1,
  2. R. C. Sprandel2 and
  3. K. T. Faber2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch79

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

Gonczy, S. T., Sprandel, R. C. and Faber, K. T. (1997) Tensile Tests of Miniature Fiber Reinforced Ceramic Composites for Screening Process-Property Relations, 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.ch79

Author Information

  1. 1

    Gateway Materials Technology, Mt. Prospect, IL

  2. 2

    Dept. of Materials Science & Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, IL

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:

  • composites;
  • preceramic polymer;
  • fibrous failure;
  • load-deflection;
  • tensile tests

Summary

Mechanical testing of 2-D and 3-D composites in bar geometries is material, time, and cost intensive. As an alternative low-cost, rapid-fabrication geometry, multifilament Nicalon™ (with pyrolytic carbon-coating) tows were densified with the preceramic polymer (Blackglas™) technology to form single tow ceramic ”mini-composites”. Using modified ASTM tow testing methods, the Blackglas-Nicalon(C) mini-composites were tested in tension at ambient temperatures. The ceramic mini-composites had fibrous failure with linear load-deflection curves and mean breaking loads of 70 N. Gage length (1, 2.5 & 5 cm) effects on breaking loads were minimal. The coefficient of variation (CoV) for the ceramic mini-composites was 19% as compared to a 10% CoV for earlier tensile tests on Blackglas-Nicalon 2-D fabric composite bars. Results were compared to tensile tests of epoxy-Nicalon tows. Breaking strengths of the ceramic mini-composites were roughly 30% of the breaking strengths of the epoxy-Nicalon composites. Oxidation at 600° and 1000°C for 1 hour embrittled the Blackglas-Nicalon (C) composites and reduced the breaking load to values of 42 N and 17 N, respectively.