Abstract：A series of experiments were carried out by changing the particle size of graphite powder and the amount of graphite powder by using a self-developed device of preparing graphene by electrical explosion of graphite powder confined in a tube. The products after explosion were characterized and analyzed by SEM and TEM. Combined with the current and voltage signals in the electrical explosion process, the effects of particle size and graphite powder amount on the preparation of graphene by electrical explosion were studied. The results show that when the particle size of graphite powder is 600 mesh, the explosive product is graphene. The yield of graphene decreases with the increase of the amount of graphite powder in a single explosion. The energy deposition rate before breakdown at the particle size of 200 mesh is significantly higher than that the particle size of 600 mesh, and all the products obtained at 600 mesh are graphene, which is mainly related to the origin of natural graphite with different particle size. The particle size is small and the bond between microcrystals is weak. When the energy deposition rate is low, the deposited energy is enough to cause the fracture between the microcrystals. In addition, with the decrease of powder content, the energy deposition rate before breakdown increases significantly.
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2022, Vol. 29 