Applied Composite Materials

, Volume 6, Issue 5, pp 309–326 | Cite as

Molded Carbon–Carbon Composites Based on Microcomposite Technology

  • Alisa Buchman
  • Robert G. Bryant


A one-step, cost-effective processing methodology based on compression molding of a mixture of graphite particles and short fibers, both coated with a soluble polyimide adhesive was developed. This technique shows a considerable potential in decreasing the complexity of the current carbon–carbon fabrication procedures. The new process eliminates additional infiltration and densification steps following the initial carbonization, which reduces the processing time from 5 weeks to 3–5 days and saves energy. The structure and properties of the new carbon–carbon composites were characterized using optical and electronic microscopy, thermal analysis, density and porosity measurements, and mechanical properties (hardness and flexural strength).

The flexural strengths ranged from 20–45 MPa. The densities ranged from 1.9 to 2.2 g/cc (which is close to pure graphite) while the porosity was as low as 3%. The CTE was approximately ± 1 ppm/C (R.T. to 550C). The thermal stability of the carbonized and graphitized specimens when heated in flowing air up to 500C and flowing nitrogen up to 1000C showed no observable weight loss.

There are numerous applications for these materials which include: optical mirrors, medical implants, thermal radiators and parts for rotating equipment, etc.

A car piston was successfully molded using a mixture of polymer coated graphite powder, flakes and chopped fibers.

carbon–carbon microcomposites polyimide resin pyrolysis graphite molding compounds 


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  1. 1.
    Buckley, J. D. and Edie, D. D., Carbon-Carbon Materials and Composites, Noyes Publishing Co., New Jersey, 1993.Google Scholar
  2. 2.
    Chellappa, V. and Jang, B. Z., 'Development of Short Carbon Fiber/Carbon Matrix Composites', in 26th International SAMPE Tech. Conference, 17–20 Oct., 1994, p. 491.Google Scholar
  3. 3.
    Bryant, R. G., 'LaRC-SI: A Soluble Aromatic Polyimide', High Performance Polymers 8(4), 1996, 607.Google Scholar
  4. 4.
    Bryant, R. G., 'The Electronic Application of LaRC-SI', in Proceedings of the 19th Annual Meeting of the Adhesion Society, 14–19 Feb., Myrtle Beach, SC, 1996, p. 36.Google Scholar
  5. 5.
    Manocha, L. M., Yashuda, E., Tanabe, Y. and Kimura, S., 'Effect of Carbon Fiber Surface-Treatment on Mechanical Properties of C/C Composites', Carbon 26(3), 1988, 333.Google Scholar
  6. 6.
    Oberlin, A., 'Carbonization and Graphitization', Carbon 22(6), 1984, 521.Google Scholar
  7. 7.
    Sidess, A., Holdengraber, Y. and Buchman, A., 'A Fundamental Model for Predicting of Optimal Particulate Composite Properties', Composites 24(4), 1993, 355.Google Scholar
  8. 8.
    Nightingale, R. E., Nuclear Graphite, Academic Press, New York, 1962.Google Scholar
  9. 9.
    Tsai, J. S., 'The Relationship between Oxidized Degree and Carbonization Temperature of Carbon Fibers', SAMPE J. 29(5), 1993, 15.Google Scholar
  10. 10.
    Vaidya, U. K., Mahfuz, H. and Sjeelan, S., 'Hybridization Concepts and Nondestructive Evaluation of Carbon-Carbon Composites', in 26th International SAMPE Tech. Conference, 17–20 Oct., 1994, p. 483.Google Scholar
  11. 11.
    Babu, V. S. and Seehra, M. S., 'Modeling of Disorder and X-ray Diffrection in Coal-Based Graphitic Carbons', Carbon 34(10), 1996, 1259.Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Alisa Buchman
    • 1
  • Robert G. Bryant
    • 2
  1. 1.Mechanical Eng.Old Dominion UniversityNorfolkUSA
  2. 2.NASA Langley Research CenterMS 226HamptonUSA

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