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The natural graphite can be devided into two kinds,one is natural flake graphite powder,and another one is aphanitic graphite powder,the classification is according to the crystallization morphology. The crystal diameter of the graphite >1μm is called natural flake graphite, and it can be seen the crystal structure by naked eye or ordinary microscope;and another type with the crystal diameter of the graphite <1μm,and it’s hard to see the crystal structure under the microscope,so it’s called aphanitic graphite powder,and most aphanitic graphite powder sharp as the earth,so it is also called amorphous graphite. According to the size of the scale,the flake graphite powder can be classified as different grade,the particle size>+0.3mm,+0.18mm and+0.15mm,it’s called large scale graphite powder,and the size below 0.15mm,it’s…
The production technology of the isostatic graphite is different from the graphite electrode. The isostatic graphite need the raw material which has an isotropic structure property. It need to grind into finer powder,and use the cold press molding technology(the isostatic press molding is one kind of the the cold press molding) the baking cycle is very long,and for the high density,it need more times’ dipping and baking.and the graphitization cycle is more than normal graphite. The main technology mainly includes: 1) raw material grinding the particle size need to processed into 20 μm below. For now,the finest isostatic graphite particle size is 1μm,and it must need the superfine mill. 2) the kneading processing make the powder and coal asphalt adhesive…
Graphite/resin composite bipolar plate has aroused wide public concern due to its good moldability, high flexural strength and electrical conductivity, good corrosion resistance. In this paper, carbon nanofibers's high strength,high electrical and thermal conductivity as well as excellent surface size effect was utilized to enhance the performance of graphite / resin composite bipolar plates. Expanded graphite is widely used as the conductive filler, polyimide and benzoxazine as binder. The mixing method of expanded graphite and resin with large density difference was studied and the effect of resin content, molding temperature and pressure, holding time were also investigated. Using artificial graphite as the conductive filler and the above two kinds of resin as the binder, the paper investigated the effect of…
