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Microscopic techniques to examine structure in anisotropic cokes
Author(s) -
Markovic V.,
Marsh H.
Publication year - 1983
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1983.tb04599.x
Subject(s) - carbonization , materials science , optical microscope , coke , texture (cosmology) , lamellar structure , anisotropy , petroleum coke , scanning electron microscope , polarized light microscopy , microscopy , composite material , mineralogy , optics , chemistry , metallurgy , computer science , image (mathematics) , physics , artificial intelligence
SUMMARY Petroleum pitches on carbonization form anisotropic cokes. Structure in these cokes is dependent upon the method of carbonization. For example, the delayed coker can produce needle‐cokes from suitable feed‐stocks. Structure in cokes cn be studied as the optical texture of polished surfaces using optical microscopy, the optical texture being descriptive of macro‐crystallinity within the coke. These polished surfaces of cokes when studied using polarized light indicate the orientation of the constituent lamellar molecules of the macrocystallinity to the plane of the polished surface. This approach has limited application in assessments of structure in three dimensions. The study describes how the techniques of etching of polished surfaces of coke, mapped initially by optical microscopy, using a solution of chromic acid followed by examination of the same area by scanning electron microscopy, reveals structure in anisotropic cokes.