Abstract
Carbonized contact layer of two kinds of coal particles was investigated by polarizing microscope from the view point of its cohesive strength, and the following results were obtained.1) Contact conditions after carbonization were classified microscopically as follows: cohesive contact (diffusive or non-diffusive) and brittle contact (fissile or porous).2) It was found that the contact conditions of coal particles depended on the caking indices by Gieselar plastometer.These relationships could be shown by MF1 (maximum fluidity of test coal) and ΔST (difference of the solidification temperature of two kinds of coal) diagrammatically.3) Small ΔST is the necessary condition for good cohesive contacts.4) The larger the ΔST is, the weaker the strength of the contact zone is. In this case, larger MF1 is the necessary condition for good cohesive contacts.
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