Journal of Materials Science

, Volume 29, Issue 18, pp 4757–4763 | Cite as

Formation of mesophase spherules in low-Ql coal tar pitches and development of monolithic carbons therefrom

  • G. Bhatia
  • R. K. Aggarwal
  • N. Punjabi
  • O. P. Bahl


Three coal tar pitches having different and low contents of primary quinoline insolubles (Ql) were subjected to a series of thermal treatments at a predetermined temperature for different periods of soaking. The development of mesophase, in terms of its size and content in the heat-treated pitches, was studied as a function of the soaking time and content of primary quinoline insolubles in the original pitches. Mesophase spherules, with an average size of about 5 μm, formed in one of the coal tar pitches were separated using solvent extraction employing a suitable tar oil. These spherules, also called “mesocarbon microbeads (MCMB)”, after being moulded into small rectangular plates, were carbonized at temperatures of 950 and 2700 °C to obtain fine textured monolithic carbons possessing apparent densities of 1.66 and 1.85 g cm−3, respectively, at these heat-treatment temperatures.


Polymer Thermal Treatment Solvent Extraction Quinoline Rectangular Plate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. D. Brooks and G. H. Taylor, Carbon 3 (1965) 185.CrossRefGoogle Scholar
  2. 2.
    Idem., in “Chemistry and Physics of Carbon”, Vol. 4, edited by P. L. Walker, Jr (Marcel Dekker, New York, 1968) p. 243.Google Scholar
  3. 3.
    J. L. White, G. L. Gruthrie and J. O. Gardner, Carbon 5 (1967) 517.CrossRefGoogle Scholar
  4. 4.
    H. Marsh and P. L. Walker Jr, in “Chemistry and Physics of Carbon”, Vol. 15, edited by P. L. Walker, Jr and P. A. Thrower (Marcel Dekker, New York, 1979) p. 229.Google Scholar
  5. 5.
    I. C. Lewis, J. de Chimie Physique 81 (11/12), (1984) 751.CrossRefGoogle Scholar
  6. 6.
    H. Honda, Carbon 26 (1988) 139.CrossRefGoogle Scholar
  7. 7.
    G. Bhatia, E. Fitzer and D. Kompalik, ibid. 24 (1986) 489.CrossRefGoogle Scholar
  8. 8.
    J. W. Stadelhofer, Fuel 59 (1980) 360.CrossRefGoogle Scholar
  9. 9.
    M. Forest and H. Marsh, ibid. 62 (1983) 612.CrossRefGoogle Scholar
  10. 10.
    H. Marsh, C. S. Latham and E. M. Gray, Carbon 23 (1985) 555.CrossRefGoogle Scholar
  11. 11.
    R. Menendez, E. M. Gray, H. Marsh, R. W. Pysz and E. A. Heintz, ibid. 29 (1991) 107.CrossRefGoogle Scholar
  12. 12.
    H. Honda and Y. Yamada, “Ceramic Data Book” (Kogyoseihio Gijutsu Kyokai, Tokyo, 1973) p. 377.Google Scholar
  13. 13.
    Y. Nakagawa, K. Fujita and M. Mori, in Proceedings of the 17th Biennial Conference on Carbon, KY, 16–21 June 1985 (American Carbon Society, 1985) p. 409.Google Scholar
  14. 14.
    A. Oya, in Proceedings of the Indo-Japanese Workshop on Pitch and Pitch Based Products, New Delhi, 24–25 November 1989 (Indian Carbon Society, New Delhi, 1989) p. 58.Google Scholar
  15. 15.
    G. Bhatia, R. K. Aggarwal and O. P. Bahl, ibid. p. 22.Google Scholar
  16. 16.
    B. Rand and C. Stirling, in Extended Abstracts and Program, 20th Biennial Conference on Carbon, CA, 23–28 June 1991 (American Carbon Society, 1991) p. 204.Google Scholar
  17. 17.
    K. Nagayama, T. Torii, H. Hatano and N. Fukuda, ibid. p. 206.Google Scholar
  18. 18.
    G. Bhatia, R. K. Aggarwal, N. Punjabi and O. P. Bahl, Presented at the Second Annual General Meeting of Material Research Society of India, New Delhi, 9–10 February 1991.Google Scholar
  19. 19.
    Idem., in Proceedings of the Fifth International Carbon Conference (Carbon '92), Essen, 22–26 June 1992 (German Carbon Group) p. 914.Google Scholar
  20. 20.
    Idem., in Proceedings of the National Workshop on Newer Carbon Products and Their Applications, Bangalore, 9–10 October 1992 (Indian Carbon Society, New Delhi, 1992) p. 398.Google Scholar
  21. 21.
    G. Bhatia, R. K. Aggarwal and O. P. Bahl, J. Mater. Sci. 22 (1987) 3847.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • G. Bhatia
    • 1
  • R. K. Aggarwal
    • 1
  • N. Punjabi
    • 1
  • O. P. Bahl
    • 1
  1. 1.Carbon Technology UnitNational Physical LaboratoryNew DelhiIndia

Personalised recommendations