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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
Papers

Abstract

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.

Keywords

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.

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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

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