Coalescence of mesophase spheres and microstructure of graphitic carbon revealed by scanning electron microscopy

Coalescence of mesophase spheres and microstructure of graphitic carbon revealed by scanning... The structural characteristics of mesophase spheres slowly coalesced in a petroleum pitch by high-temperature centrifugation were studied by high-resolution SEM, after stabilization and carbonization. The patterns of lamellae stacking as well as fine structural defects have been observed clearly below 100 nm at the level of near-single lamellar layer, for four distinct development stages, e.g., single-crystal sphere, just contacted, coalesced and bulk mesophase. Clear images from the inside and the outside and from more than one directions have confirmed the single-crystal nature before coalescence, but some defects of highly curved lamellae and cracks were found in just-contacted spheres. In highly coalesced situations, additional other nano-scaled defects were observed, including disclinations, dislocations, cracks and voids, although the defect density appeared to drop at the bulk mesophase stage. The evolution of lamellar stacking was examined schematically by bonded lamellar layers, and the microstructural defects were analyzed under different categories. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Coalescence of mesophase spheres and microstructure of graphitic carbon revealed by scanning electron microscopy

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-017-1364-3
Publisher site
See Article on Publisher Site

Abstract

The structural characteristics of mesophase spheres slowly coalesced in a petroleum pitch by high-temperature centrifugation were studied by high-resolution SEM, after stabilization and carbonization. The patterns of lamellae stacking as well as fine structural defects have been observed clearly below 100 nm at the level of near-single lamellar layer, for four distinct development stages, e.g., single-crystal sphere, just contacted, coalesced and bulk mesophase. Clear images from the inside and the outside and from more than one directions have confirmed the single-crystal nature before coalescence, but some defects of highly curved lamellae and cracks were found in just-contacted spheres. In highly coalesced situations, additional other nano-scaled defects were observed, including disclinations, dislocations, cracks and voids, although the defect density appeared to drop at the bulk mesophase stage. The evolution of lamellar stacking was examined schematically by bonded lamellar layers, and the microstructural defects were analyzed under different categories.

Journal

Journal of Materials ScienceSpringer Journals

Published: Jul 27, 2017

References

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