The use of graphite
The use of graphite
1, refractory material: graphite and its products have the properties of high temperature resistance, high strength, in the metallurgical industry is mainly used to manufacture steel commonly used in graphite crucible, graphite as the protective agent of steel ingot, metallurgical furnace lining. 2 conductive material: used for manufacturing the electrode, carbon nanotubes, carbon brush, and the positive electrode of the mercury rectifier in the electrical industry, graphite gasket, telephone parts, TV tube coating etc..
3 for wear-resistant lubrication materials: Graphite in the machinery industry often as a lubricant. Lubricating oil may not be used in high speed, high temperature and high pressure conditions, while the graphite wear-resistant materials in 200~2000 temperature in high sliding speed, no lubricating oil. Many conveying corrosive medium equipment, widely used in graphite materials made of piston cup, sealing ring and bearing, they run without adding lubricating oil. Graphite is many metal processing (drawing, drawing) the good lubricant.
4 graphite has good chemical stability. After special processing of graphite, with corrosion resistance, good thermal conductivity, low permeability, is widely used in the manufacturing of the heat exchanger, the reaction tank, condenser, combustion tower, absorption tower, cooler, heater, filter and pump equipment. Widely used in petrochemical industry, hydrometallurgy, acid-base production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.
5 for casting, casting, molding and high-temperature metallurgical material: Graphite due to thermal expansion coefficient is small, and the capability of cold and hot change, can be used as a mold of the glass, the use of graphite after black metal castings get precise size, smooth surface, high rate of finished products, without processing or slightly processing can be used so we can save a lot of metal. Production of cemented carbide and other powder metallurgy technology, usually made of graphite materials and sintered ceramic boat. Monocrystalline silicon crystal growth crucible, area refining containers, support fixtures, induction heaters are processed with high purity graphite. In addition graphite can also be used for vacuum smelting graphite insulation board and base, high temperature resistance furnace tube, rods, plates, lattice shed and other components. 6, for atomic energy industry and national defense industry: graphite has excellent neutron moderator for atomic reactors, uranium graphite reactor is widely used in nuclear reactor. As the power of the atomic reactor in the deceleration material should have high melting point, stable, corrosion resistance performance, graphite can meet the above requirements. The purity of graphite used in the atomic reactor requirements of high impurity content should not exceed dozens of PPM. In particular the boron content should be less than 0.5PPM. Also used in the defense industry to produce solid rocket fuel nozzle, missile nose cone, parts of aerospace equipment, insulation materials and radiation protection materials.
7 graphite can prevent boiler scale, the unit test showed that, in the graphite powder by adding a certain amount of water (about 4~5 grams per ton of water) can prevent fouling of boiler. In addition graphite coated metal chimney, roof, bridges, pipelines can be anti-corrosion rust.
8 graphite can be used as pencil core, pigment, polishing agent. Graphite after special processing, can produce a variety of special materials used in the relevant industrial sector.
9 electrode: graphite can replace copper as electrode
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