Use Of Graphite

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.

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. For 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 metal 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.

6, for the atomic energy industry and the national defense industry: graphite has a good neutron moderator for use in atomic reactors, uranium-graphite reactor is a more widely used atomic reactor. The decelerating material in the nuclear reactor as a power source should have a high melting point, stable, and corrosion-resistant properties, and graphite can fully satisfy 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. Adding a certain amount of graphite powder to water (about 4 to 5 grams per ton of water) prevents fouling on the boiler surface. In addition, graphite can be 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.
9. Electrode: Graphite can replace copper as an electrode. In the 1960s, copper was widely used as an electrode material, with a usage rate of about 90% and graphite of only about 10%. In the 21st century, more and more users began to choose graphite as an electrode material, in Europe, more than 90%. The above electrode material is graphite. Copper, the once dominant electrode material, has almost lost its advantages compared to graphite electrodes. Graphite gradually replaces copper as the material of choice for EDM electrodes.