Changes in the yield and size distribution of mesophase spheres on suppressing convective motion in a fused coal tar pitch

R. Moriyama, J. I. Hayashi, R. Goda, T. Chiba

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Upon heating of a coal tar pitch at 703 K, vaporization of the tar was promoted to a degree of 15-20 wt.%, either by increasing the free surface of the fused pitch exposed to a N2 atmosphere or by jetting N 2 onto the surface. Enhanced viscosity of the pitch matrix by removing tar combined with restricted convection of the matrix prevented mesophase spheres from frequent coalescence and maintained a high interfacial area between the spheres and the matrix. The high interfacial area allowed a rapid increase in yield and sphere size. Sphere yields were up to 30 vol.% of the residual pitch, which lacked a bulk mesophase, and in which the average sphere radius was 2-4 μm.

Original languageEnglish
Pages (from-to)205-213
Number of pages9
JournalMaterials Chemistry and Physics
Volume92
Issue number1
DOIs
Publication statusPublished - Jul 15 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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