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This way has an advantage of stable oxidation reaction and easy control,the graphite felt after electrochemistry treatment shows that the voltage efficiency can be reach 85%,and the current efficiency can reach 95%,and the circle property is very stable.after the analysis of XPS and FT-IR,the results show that the effect of electrochemistry treatment mainly increase the quality of the O/C rate on the surface of graphite felt,especially to the number of COOH.the results of SEM and (BET)/N2 show that the electrochemistry treatment can increase the surface area of the graphite felt,and increase the reaction area of the electrode.the electrochemistry treatment reduce the electric resistance of the graphite felt,the reason is mainly from the increasing of the COOH number on the surface…
Carbon carbon composite material is made of reinforcing carbon fiber and carbon matrix,the C/C composite material need presoma decompose into matrix carbon,the property of the carbon decide that it can not be made by the inorganic material and metal matrix composite material. The preparation method mainly divided into three steps: prefabricate the carbon fiber embryo then increase the carbon content and density of the matrix and the last one is high temperature heating(graphitization). 1、According to the different requirement and different production,the way to make the carbon fiber embryo mainly have: 1) Short fiber molding, 2) Long fiber weaving and lamination, 3) Multidimensional weaving or puncturing. 4) Novoltex 3D fine woven fabric. 2、There are three methods to increase the carbon content…
Graphite is a carbonaceous element mineral crystals, crystal lattice of its hexagonal layered structure, shown in Figure 1 - 1. The distance between each grid is 3.40, and the spacing of carbon atoms in the same network layer is 1 42A. Is the six party system, layered with complete cleavage. The cleavage surface is mainly composed by molecular bonding, weak on the molecular attraction, so the natural floatability is very good. Graphite soft, dark gray, greasy feeling, can pollute paper. Hardness of 1 to 2, along the vertical direction along with the increase of impurities can be increased from 3 to 5. Specific gravity is 1.9 to 2.3. Under the condition of isolated oxygen, its melting point is above 3000,…
