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Korean Carbon Society (한국탄소학회)
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Formation of Isotropic Carbon Matrix in Carbon/Carbon Composites Derived from Pitch

  • Ahn, Chong-Jin (Department of polymer Science and Engineering, Chungnam National University) ;
  • Park, In-Seo (Agency for Defense Development) ;
  • Joo, Hyeok-Jong (Department of polymer Science and Engineering, Chungnam National University)
  • Received : 2010.08.30
  • Accepted : 2010.12.07
  • Published : 2010.12.30
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Abstract

To manufacture a carbon/carbon composite the coal tar pitch was used as the matrix precursor and the PAN (polyacrylonitrile)-based carbon fiber was used as the reinforcing material to weave 3-directional preform. For pressure carbonization HIP equipment was used to produce a maximum temperature of $1000^{\circ}C$ and a maximum pressure of 100 MPa. The carbonization was induced by altering the dwell temperature between $250^{\circ}C$ and $420^{\circ}C$, which is an ideal temperature for the moderate growth of the mesophase nucleus that forms within the molten pitch during the pressure carbonization process. The application of high pressure during the carbonization process inhibits the mesophase growth and leads to the formation of spherical carbon particles that are approximately 30 nm in size. Most particles were spherical, but some particles were irregularly shaped. The spread of the carbon particles was larger on the surface of the carbon fiber than in the interior of the matrix pocket.

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References

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