Preparation of modified graphite powder and study on enhancing carbon-graphite materials
Graphite powder with high graphitization degree,self-lubrication,high temperature resistance,good electrical and thermal conductivity,is usually used as an enhancing phase in the carbon-graphite material system to improve the density,electrical and ther-mal conductivity of the carbon-graphite blocks.However,the surface active functional group of graphite powder is less,which affects the wettability of coal tar pitch,resulting in poor affinity with coal tar pitch.Herein,using artificial graphite powder as raw material,a meth-od of enhancing the properties of graphite powder is introduced in this paper.The modified graphite powder is prepared by auxiliary wet-tability and active design with artificial interface on its surface.It is found that both the wettablility and interfacial bonding force of graphite powder and coal tar pitch are improved.The results show that the mechanical properties of the mixed fillers based carbon-graphite blocks prepared by mixing the modified graphite powder with calcined pitch coke are enhanced,and the compressive strength and flexural strength of AGCB5-400 are increased by 60.7%and 22.4%,respectively.The compressive strength and flexural strength of the AGCB12-400 are increased by 34.0%and 22.6%,respectively.The active design concept and enhancing effect of modified graphite powder will provide ideas for raw material optimization in special graphite industry.
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