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Effects of chemical composition of carbonaceous powder on morphology and thermal properties of graphite blocks

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(3), pp.797-805
  • DOI : 10.1007/s42823-021-00312-8
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : September 19, 2021
  • Accepted : December 1, 2021
  • Published : May 1, 2022

Hsu Jen-Yung 1 Su Chun-Jen 2 Yen Yung-Lin 3 Lee Che-Yun 4

1New Materials Research & Development Department
2National Synchrotron Radiation Research Center
3Research & Development Department
4Research & Development Department, China Steel Chemical Corporation

Accredited

ABSTRACT

Two kinds of mesocarbon microbeads (MCMBs) with different chemical composition have been synthesized. The MCMBs were molded and heat treated at temperatures above 2000 °C to obtain graphite blocks. The effects of chemical composition of MCMBs on the pore morphology, carbon texture and thermal properties of the derived graphite blocks have been explored. The pore morphology was investigated by small angle X-ray scattering technique and a graphitization-induced morphology transition was observed. When the graphitic crystallite size exceeded a threshold value, the association of crystallites and migration of randomly distributed pores took place extensively. For the graphite blocks made of MCMBs which had light components with higher aromaticity value, the growth of crystallites caused a significant enhancement in thermal conductivity for the specimens. However, for the other kind of MCMBs, their light components tended to form solid porous carbon texture after graphitization, and the thermal conductivity coefficients of their graphite blocks could only increase slightly as crystallites grew. It was suggested that the thermal resistance at the granule’s boundary became noticeable in the latter case and thus the growth of thermal conductivity coefficients was prominently hindered.

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