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Thermal conductivities of a needle-punched carbon/carbon composite with unbalanced structures

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2021, 31(3), pp.463-471
  • DOI : 10.1007/s42823-020-00174-6
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : April 26, 2020
  • Accepted : July 30, 2020
  • Published : June 1, 2021

Lee Jungmin 1 Lee Hyung Ik 2 Paik Jong Gyu 2

1국방화학연구소
2국방과학연구소

Accredited

ABSTRACT

The XYZ 3-dimensional thermal conductivities of the C/C up to 2000 °C were measured by a laser fash method. Carbon fberreinforced carbon composites (C/C) were generally developed for aerospace missions due to their excellent thermal resistivity at ultrahigh temperature. C/C must endure harsh environments such as thousands of degrees Celsius without degradation of its mechanical properties. To solve this problem, among the passive thermal protection system, we suggest a method of conducting more heat through the mono-axial direction, which resulted in ease of the thermal rise in the heat receiving part. For example, the X-43A fight applied unbalanced C/C (UCC) with diferent carbon fber orientation ratios according to the XY direction in the leading edge part. To investigate the diference in thermal conductivity between unbalanced C/C (UCC) and balanced C/C (BCC), unbalanced and balanced preforms were prepared by a needle punching process, and then they were densifed by pitch infltration and a carbonization process. We compared and analyzed the efects of unbalanced C/C(UCC) and balanced C/C (BCC) structures on the thermal conductivity. We also designed the “rule of mixtures” equation for calculating thermal conductivities of each C/C using reported data of carbon fber and graphite matrix. Our calculations of thermal conductivity ratio match the ratio of real data.

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