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

R. Moriyama, Hayashi Jun-Ichiro, 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

Fingerprint

Coal Tar
Coal tar
tars
coal
Tars
Tar
matrices
Coalescence
Vaporization
coalescing
convection
Viscosity
viscosity
Heating
atmospheres
heating
radii

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Changes in the yield and size distribution of mesophase spheres on suppressing convective motion in a fused coal tar pitch. / Moriyama, R.; Jun-Ichiro, Hayashi; Goda, R.; Chiba, T.

In: Materials Chemistry and Physics, Vol. 92, No. 1, 15.07.2005, p. 205-213.

Research output: Contribution to journalArticle

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