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 often used as a protective agent for steel ingots and as the lining of metallurgical furnaces.
In the electrical industry, it is used to manufacture electrodes, brushes, carbon rods, carbon tubes, positive electrodes of mercury rectifiers, graphite gaskets, telephone parts, coatings for TV picture tubes, etc.
Graphite is often used as a lubricant in the machinery industry. Lubricating oil often cannot be used under the conditions of high speed, high temperature and high pressure, while the graphite wear-resistant material can work at a high sliding speed at a temperature of 200~2000 ℃ without lubricating oil.
Many equipment for conveying corrosive media widely use carbon graphite materials to make piston cups, sealing rings and bearings, and they do not need to add lubricating oil during operation. Graphite milk is also a good lubricant for many metal workings (wire drawing, tube drawing).
Specially processed graphite has the characteristics of corrosion resistance, good thermal conductivity and low permeability, and can be widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, pump equipment.
Widely used in petrochemical, hydrometallurgy, acid-base production, synthetic fiber, papermaking and other industrial sectors, graphite materials can save a lot of metal materials.
1. Graphite material can be used for casting, sand casting, compression moulding and high temperature metallurgical materials
Because graphite has a small thermal expansion coefficient and can withstand changes in rapid cooling and rapid heating, it can be used as a casting mold for glassware. After using graphite, ferrous metal can obtain castings with accurate dimensions and a high yield of smooth surfaces. It can be used without processing or a little processing, which saves a lot of metal.
In the production of powder metallurgy processes such as cemented carbide, graphite materials are usually used to make porcelain boats for compression molding and sintering. Single crystal silicon crystal growth crucibles, regional refining vessels, support fixtures, induction heaters, etc. are all processed with high-purity graphite.
In addition, graphite can also be used as graphite heat insulation board and base for vacuum smelting, high temperature resistance furnace tube, rod, plate, grid and other components.
2. Graphite materials can be used in the atomic energy industry and the defense industry
Graphite has a good neutron moderator and is used in atomic reactors, which are the most widely used atomic reactors.
As a deceleration material in a power atomic energy reactor, it should have high melting point, stability, and corrosion resistance. Graphite materials can fully meet the above requirements.
As the graphite used in atomic reactors, the purity requirements are very high, and the impurity content should not exceed several tens of PPM. In particular, the boron content should be less than 0.5PPM.
In the defense industry, graphite materials are also used to manufacture solid fuel rocket nozzles, missile nose cones, parts of spaceflight equipment, thermal insulation materials and radiation materials.
3. Graphite material can prevent boiler scaling
Relevant unit tests show that adding a certain amount of graphite powder to the water (about 4-5 grams per ton of water) can prevent scaling on the boiler surface. In addition, graphite coating on metal chimneys, roofs, bridges and pipes can prevent corrosion and rust.
4. Graphite material can be used as pencil lead, pigment, polishing agent
Graphite has been specially processed, and various special materials can be made for relevant industrial sectors. Graphite materials gradually replace copper as the preferred material for EDM electrodes.