【摘要】 借助于N2物理吸附、XRD和SEM对经多次膨胀后的天然鳞片石墨进行了研究,研究结果表明:随着膨胀次数的增加,石墨膨胀前后的松装密度的差别越来越小。在多次膨胀过程中,第一次膨胀时鳞片石墨比表面积增加量最大,后续的膨胀对石墨比表面积的影响逐渐减小。鳞片石墨经过五次膨胀后,d004和d101分别有约千分之二和千分之四的增加,多次膨胀石墨仍由石墨微晶构成。多次膨胀后石墨为蓬松状的粉末,在微观结构中出现了类似于揉搓纸团的结构。更多还原

【Abstract】 The changes of bulk density,specific surface area and microstructure of natural flake graphite after several expansions were studied by nitrogen adsorption,XRD and SEM.Results show that the differences in bulk density get smaller and smaller with increasing expansion time.The increase of specific surface area in the first expansion is much bigger than in following expansions.The lattice parameters of the graphite change very（slightly）,with d₀₀₄ and d₁₀₁ increasing by only about 0.2 % and 0.4 % respectively after five expansions.SEM images show that the expanded graphite appears like crumpled paper in an expanded state.更多还原