Use of graphite

2015/10/19 21:39:15

1. As refractory material: graphite and its products have the properties of high temperature resistance and high strength. They are mainly used to make graphite crucible in metallurgical industry. Graphite is used as lining agent of steel ingot and lining of metallurgical furnace in steelmaking.
The 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. as wear-resistant lubricant: graphite is often used as 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.
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 petroleum, chemical, hydrometallurgy, acid and alkali production, synthetic fiber, papermaking 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. 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.
6, for the atomic energy industry and the national defense industry: graphite has a good neutron reducer used in atomic reactors, uranium one graphite reactor is currently used more atomic reactor. As a power reactor, the reduction material in the reactor should have high melting point, stability and corrosion resistance. Graphite can meet the above requirements. As an atomic reactor, the purity of graphite is very high, and the impurity content should not exceed tens of PPM. In particular, boron content should be less than 0.5PPM. In the defense industry, graphite is also used to make nozzles for solid fuel rockets, nose cones for missiles, parts for aerospace equipment, thermal insulation materials and radiation protection materials.
7., graphite can prevent boiler scaling, the unit tests show that adding a certain amount of graphite powder in water (4~5 grams per ton of water) can prevent boiler surface scaling. In addition, graphite can be applied to metal chimneys, roofs, bridges and pipelines to protect against corrosion and rust.
8. graphite can be used as pencil core, pigment and polishing agent. After special processing, graphite can be made of various special materials for industrial departments.
9. electrode: how can graphite replace copper as electrode?