Fabrication of isotropic bulk graphite using artificial graphite scrap Lee, Sang-Min; Kang, Dong-Su; Kim, Woo-Seok; Roh, Jea-Seung;
Isotropic synthetic graphite scrap and phenolic resin were mixed, and the mixed powder was formed at 300 MPa to produce a green body. New bulk graphite was produced by carbonizing the green body at , and the bulk graphite thus produced was impregnated with resin and re-carbonized at . The bulk density of the bulk graphite was , and the porosity of the open pores was 29.8%. After one impregnation, the density increased to while the porosity decreased to 25.2%. Differences in the pore distribution before and after impregnation were easily confirmed by observing the microstructure. In addition, by using an X-ray diffractometer, the degrees-of-alignment (Da) were obtained for one side perpendicular to the direction of compression molding of the bulk graphite (the "top-face"), and one side parallel to the direction of compression molding (the "side-face"). The anisotropy ratio calculated from the Da-values obtained was 1.13, which indicates comparatively good isotropy.
isotropic synthetic graphite scrap;bulk graphite;impregnation;degree of alignment;anisotropy ratio;
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