STUDY OF THE RELATIONSHIP BETWEEN THERMAL CONDUCTIVITY AND MICROCRYSTALLINE PARAMETERS OF BULK GRAPHITE

Bulk graphite was prepared from calcined coke and coal tar pitch precursors by hot pressing and graphitization. The effect of the kind of the binder and the graphitization temperature on the thermal conductivity of the bulk graphite was investigated. Analysis showed that the type of binders and temperatures of graphitization played an important role in the thermal conductivity of bulk graphite. The degree of graphitization had a marked effect on the thermal conductivity at room temperature, especially when the degree of graphitization was high. Based on experimental results, the relationship between thermal conductivity and microcrystalline parameter of bulk graphite can be expressed in the estimated formula, which is λ=-86.66+7.26L a; the layers spacing of the crystallites was also almost a linear function of inverse of crystallite dimensions, which is d 002 =0.334?1+0.166?4(1/L a).