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 language | English |
|---|---|
| Pages (from-to) | 205-213 |
| Number of pages | 9 |
| Journal | Materials Chemistry and Physics |
| Volume | 92 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 15 2005 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Changes in the yield and size distribution of mesophase spheres on suppressing convective motion in a fused coal tar pitch
AU - Moriyama, R.
AU - Jun-Ichiro, Hayashi
AU - Goda, R.
AU - Chiba, T.
PY - 2005/7/15
Y1 - 2005/7/15
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=15944376266&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2005.01.019
DO - 10.1016/j.matchemphys.2005.01.019
M3 - Article
VL - 92
SP - 205
EP - 213
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
IS - 1
ER -