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 - Hayashi, J. I.
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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U2 - 10.1016/j.matchemphys.2005.01.019
DO - 10.1016/j.matchemphys.2005.01.019
M3 - Article
AN - SCOPUS:15944376266
VL - 92
SP - 205
EP - 213
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
IS - 1
ER -