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The graphite felt used for vanadium redox flow battery need to be modified,to improve the chemical activity,and find out the influence factors in graphite felt electrode,we could use different treatments on the graphite felt electrode material. Below treatments are heating treatment and acid treatment,we use polarization curve, cyclic voltammetry and AC impedance to describe the electrochemical properties of the graphite felt electrode,and describe the differences between the chemical treatment before and after,and we need to use XPS,SEM and There are different ways to treat the graphite felt electrode,such as : heating treatment,acid treatment, electrochemical treatment,etc. Put the PAN graphite felt on the crucible and put it into the muffle furnace,under the 500 C°,after 0.5 h calcinations,make it natural cooling;and on…
Special graphite covers a wide range, the Chinese electrical carbon products industry, natural graphite products industry and metallurgy with carbon products industry in this regard have different understanding and classification methods, metallurgical carbon products industry classification of habits explain, special graphite mainly refers to the high strength, high density, high purity graphite products (referred to as Sangao graphite). Sangao graphite from the organization of the material can be divided into coarse grain structure, fine grain structure and fine grain structure, from forming method of distinguish main molding special graphite, extrusion molding special graphite and static pressure molding special graphite three categories. In addition, vibration molding can also be used for the production of special graphite. High quality specialty graphite, an…
The ablation of carbon carbon composite material throat is mainly from complex gas environment,and the main reason includes: carbon sublimation, surface chemical reaction, mechanical erosion,and the fiber properties, prefabricated structure,material density, porosity, matrix carbon, degree of graphite, impurity,and there are some factors that affect the interaction. Carbon carbon composite material has many good properties,such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, thermal shock resistance,and chemical stability. Now the carbon carbon composite material is double functional composite material with structure material and thermal protection materials,and it’s already widely used in aerospace industry and other industrial system. Carbon carbon composite material now is the preferred material for nozzle throat. During the working state,the carbon carbon nozzle throat…
