What is the main function of graphite?
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 make graphite crucibles. In the process of steelmaking, graphite is often used as a protective agent for steel ingots and lining of metallurgical furnaces.
As a 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..
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, can be used without processing or minor processing, thus saving a lot of metal. A powder metallurgy process, such as hard alloy, usually made of graphite material and used as a porcelain boat for press and sintering. The crystal growth of monocrystalline silicon, crucible, zone refining vessel, bracket, jig and induction heater are all made of high purity graphite. In addition, graphite can be used as vacuum heating graphite insulation plate and base, high temperature resistance furnace tube, rod, plate, lattice and other components.
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 petroleum, chemical, hydrometallurgy, acid and alkali production, synthetic fiber, papermaking and other industrial sectors, can save a lot of metal materials.
Wear resistant materials: graphite is often used as a lubricant in the mechanical industry. Lubricants can not be used in high speed, high temperature, high pressure conditions, and graphite wear-resistant materials can be at 200~2000 degrees Celsius temperature in a high sliding speed, without lubricating oil work. Many devices for conveying corrosive media are made of graphite materials, piston cups, seals and bearings. They do not need to be lubricated when running. Graphite is many metal processing (drawing, drawing) the good lubricant.
