Abstract
Packing structure of graphite particles cast on a copper film has a profound effect on various film properties. In this research, the films prepared at different cast conditions were examined on their packing structures both from macroscopic and microscopic viewpoints. The thickness and overall voidage of the film were measured as macro-structural parameters, and the size distribution of voids among particles inside the film was also examined by image analysis on the SEM photograph of the cross-section perpendicular to the film surface to characterize the micro-structure. As a result, it was found that the highest voidage were produced with flaky natural graphite particles under all casting conditions, and that their void size distributions were narrower with smaller normalized median void diameters at the same overall voidage. On the other hand, the films made of spherical artificial graphite particles indicated wider void size distributions with larger median diameters.
