PREPARATION OF A FINE-GRAINED DOPED GRAPHITE MATERIAL AND ITS OUT-GASSING PROPERTY

A ball milling dispersion method has been developed for the preparation of multi element doped graphite with starting mixture powders below 100?nm. Such doped graphite has high thermal conductivity and excellent mechanical properties (116?MPa). The out gassing behavior of doped graphite BM (with ball milling) and CM (without ball milling) showed that there was no difference before electron beam irradiation. However, the emission of H 2, H 2O, CO, especially CO 2 of BM was much less than that of CM. A fine grained microstructure of BM was observed by SEM. The particle size, distribution and phase composition were investigated with EDX, TEM and XRD. Correlations between microstructure and properties of such doped graphite are discussed.