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Overview of graphite applications

2018-11-22 09:31 View:
1. As refractory material: Graphite and its products have the properties of high temperature resistance and high strength. They are mainly used in the metallurgical industry to manufacture graphite crucibles. In steelmaking, graphite is commonly used as a protective agent for steel ingots and the inner liner of metallurgical furnaces.
 
2. Conductive material: used in the electrical industry as a positive electrode for the manufacture of electrodes, brushes, carbon rods, carbon tubes, mercury positive flow devices, graphite gaskets, telephone parts, coatings for television picture tubes, etc.
 
3. Wear-resistant lubricants: Graphite is often used as a lubricant in the machine industry. Lubricating oils are often not used under high speed, high temperature and high pressure conditions, while graphite wear resistant materials can work at high sliding speeds of 200~2000 °C without lubricating oil. Many equipments that transport corrosive media are widely used in graphite materials to make piston cups, seals and bearings. They do not need to be lubricated during operation. Graphite milk is also a good lubricant for many metal processing (drawing, drawing).
 
4. Graphite has good chemical stability. Specially processed graphite, which has the characteristics of corrosion resistance, good thermal conductivity and low permeability, is widely used in the manufacture of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters. , pump equipment. Widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.
 
5. Casting, sanding, compression molding and pyrometallurgical materials: Because graphite has a small thermal expansion coefficient and can withstand rapid cooling and rapid changes, it can be used as a mold for glassware. After using graphite, ferrous metals can be used to obtain accurate casting dimensions and high surface finish yield. It can be used without processing or a little processing, thus saving a lot of metal. Production of cemented metallurgy and other powder metallurgy processes, usually made of graphite materials for stamping and sintering of porcelain boats. Crystal growth of single crystal silicon, regional refining vessels, bracket fixtures, induction heaters, etc. are all processed from high purity graphite. In addition, graphite can also be used as a vacuum smelting graphite heat insulation board and base, high temperature resistance furnace tube, rod, plate, grid and other components.
 
6, for the atomic energy industry and the defense industry: graphite has a good neutron moderator for use in atomic reactors, uranium-graphite reactor is currently a more widely used atomic reactor. The decelerating material in the nuclear reactor as a power source should have high melting point, stable and corrosion resistance, and graphite can fully meet the above requirements. The purity of graphite used as an atomic reactor is very high, and the impurity content should not exceed tens of PPM. In particular, the boron content should be less than 0.5 PPM. In the defense industry, graphite is also used to make solid fuel rocket nozzles, missile nose cones, parts of space navigation equipment, insulation materials and radiation protection materials.
 
7. Graphite also prevents boiler fouling. The relevant unit tests have shown that adding a certain amount of graphite powder (about 4 to 5 grams per ton of water) in water can prevent scaling on the boiler surface. In addition, graphite is coated on metal chimneys, roofs, bridges and pipes to prevent corrosion and rust.
 
8. Graphite can be used as pencil lead, pigment, and polishing agent. After special processing of graphite, various special materials can be produced for the relevant industrial sectors.
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MoDTP (Liquid Molybdenum Dithiophosphate)
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