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The difference between artificial graphite and natural graph

2018-09-20 14:04 View:
1, crystal structure
Natural graphite: crystal development is relatively complete, the degree of graphitization of flake graphite is more than 98%, and the degree of graphitization of natural microcrystalline graphite is usually below 93%.
Artificial graphite: The degree of crystal development depends on the raw materials and heat treatment temperature. In general, the higher the heat treatment temperature, the higher the degree of graphitization. At present, the degree of graphitization of industrial artificial graphite usually less than 90%. diamond powder

2, organizational structure
Natural flake graphite: It is a single crystal with a simple structure and only crystallographic defects (such as point defects, dislocations, stacking faults, etc.), and macroscopically exhibits anisotropic characteristics. The crystallites of natural microcrystalline graphite are small, the crystal grains are arranged in disorder, and the pores exists after the impurities are removed. cobalt powder macroscopically isotropic.
Artificial graphite: can be regarded as a multi-phase material, including graphite phase transformed by carbon particles such as petroleum coke or pitch coke, graphite phase transformed by coal tar binder coated around particles, particle accumulation or coal tar pitch A pore formed by heat treatment of the junction.silicon powder

3. Physical form
Natural graphite: usually in the form of powder, can be used alone, but usually combined with other materials.
Artificial graphite: It has many forms, both powdery, fibrous and massive, while the narrowly defined artificial graphite is usually in the form of a block, molybdenum diboride which needs to be processed into a certain shape when used.

4. Physical and chemical properties
In terms of physical and chemical properties, natural graphite and artificial graphite have both commonalities and performance differences. For example, natural graphite and artificial graphite are good conductors of heat and electricity, but for graphite powder of the same purity and particle size, natural flake graphite has the best heat transfer performance and electrical conductivity, aluminum diboride followed by natural microcrystalline graphite, artificial graphite. lowest. Graphite has good lubricity and certain plasticity. The crystal development of natural flake graphite is perfect, the friction coefficient is small, the lubricity is the best, the plasticity is the highest, and the dense crystalline graphite and cryptocrystalline graphite are the second, artificial graphite. Poor.

5, application areas
In the metallurgical industry, natural flake graphite can be used to produce refractory materials such as magnesia carbon bricks and aluminum carbon bricks because of its good oxidation resistance. Artificial graphite can be used as a steelmaking electrode, and an electrode made of natural graphite is difficult to use in a more demanding steelmaking electric furnace.
In the mechanical industry, graphite materials are commonly used as wear and lubrication materials. Natural flake graphite has good lubricity and is often used as an additive for lubricating oils. For the equipment that transports corrosive media, piston rings, seals and bearings made of artificial graphite are widely used, and no lubricating oil is needed for work. Natural graphite and polymer resin composites can also be used in the above fields, but the abrasion resistance is not as good as that of artificial graphite.
In the chemical industry, artificial graphite has the characteristics of corrosion resistance, good thermal conductivity and low permeability. It is widely used in the chemical industry to make equipment such as heat exchangers, reaction tanks, absorption towers, filters, and the like. Natural graphite and polymer resin composites can also be used in the above fields, but thermal conductivity and corrosion resistance are inferior to artificial graphite.

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