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High purity graphite is refers to the carbon content is more than 99. 99% which is high strength, high density, high purity, high chemical stability, compact structure, high temperature resistance and high conductive rate,also has a good wear resistance. High purity graphite is widely used in metallurgy, chemical industry, aerospace, Electronics, Mechanics, Nuclear power industry etc. Graphite purification method is mainly divided into two categories,one is the wet purification, including flotation, acid-alkali, hydrofluoric acid.The other is the fire purification method, including chlorination roasting method and high temperature method.In addition,with petroleum coke as raw materials to produce high grade fine particles of high purity graphite is also widely used. The production process is: Raw material→calcinations→crocus→ingredients→mix and knead→fine powder→molding→baking→dipping→graphitization. Under the 2000~2800℃…
The graphite crucibles can be divided into two major kinds by the raw material , the first kind is the pure graphite crucibles , with the raw material of the pure graphite blocks and rods , with the different uses and dimensions requirements of the crucibles , we can decide which kind of the graphite material be used , such as the isostatic graphite blocks and rods , moulded graphite blocks and rods , vibracation graphite blocks and rods , extruded graphite blocks and rods . We can aslo make the production and machining of required dimensions and drawings by the customers ; The second kind is the pressed graphite crucibles , it can be divided into the Clay graphite…
Graphite and astronomical silicate material are computed using available laboratory and astronomical data. The exfoliation of graphite is a phase transition involving the vaporization of the intercalate in the graphite. Exfoliated graphite is an expanded graphite with a low density. It is noted that the magnetic dipole contribution to absorption in the infrared wavelengths can be important for conducting particles such as graphite. Formulas are given for evaluating electric and magnetic dipole cross-sections for small particles. Absorption cross-sections are evaluated for graphite and silicate particles with sizes between 0.003 and 1.0 microns, and wavelengths from 300 A to 1000 microns. On the basis of polarization profiles computed for both prolate and oblate graphite-silicate spheroids, it is concluded that interstellar silicate…
