The use of graphite
Graphite has refractory high temperature resistance, high electrical and thermal conductivity, lubricity, chemical stability, plasticity and thermal shock resistance and acid resistance and alkali resistance etc.
Because the graphite has the special performance, so a wide range of applications. Graphite and its products is indispensable for the development of metallurgy, machinery, petroleum, chemical industry, nuclear industry, agriculture, national defense, yarn, pencil manufacturing, electrical, television, glass manufacturing, cast iron welding rod and so on the industrial sector, lubrication, sealing, conductive refractory, acid, alkali and structural materials. Its main use is as follows ：
1, the graphite in the metallurgical industry, mainly used in the manufacture of crucible, used for smelting metal and precious metal and rare metal ingot; as protective agent for graphite in the steel industry, with the graphite manufacturing magnesia carbon brick as furnace lining and carbon filling agent. Graphite crucible and graphite crystal slice of life, crystalline flake is greater, the higher strength, high temperature resistant performance is better, the longer the service life of the crucible. Manufacturing crucible generally uniform with 80 orders and 50 orders (0.3 ~ 0.18 mm) graphite is the reason 。
2, as a conductive material
Graphite is widely used in the electrical industry as electrode, brush, carbon, mercury rectifier anode, graphite gasket, graphite ring, electric live parts, television picture tube coating etc.. The most widely used graphite electrode. Electrical appliance industry with graphite, is very high to the size requirements. Particle size control in 150 ~ 325 mesh, (0.1 ~ 0.42mm) range, and requests the television picture tube graphite on the graphite particle size is below 0.5 microns. Fixed carbon content in 60 ~ 999% range, the harmful impurities content requirement is in 1% the following, 5ppm the following requirements in color picture tube coating harmful impurity. In recent years, the application of graphite has been widely applied to the cathode materials for rechargeable lithium ion battery, increasing market share.
3, wear-resistant and lubricating material
Graphite as wear-resistant materials and lubricants in mechanical industry, Ishi Sumisaku wear resistant materials can be -200 ~ 2000 ℃ temperature range, with a speed of 100 m / s sliding, no lubricating oil. Shi Moru is one of many metal processing (drawing, drawing lubricant is good)
4, as the sealing material
Using flexible graphite as ring, sealing ring for centrifugal pump, turbine, hydraulic turbine and transporting corrosive media devices etc..
5, moulding, casting, molding and high temperature metallurgical materials
Graphite can be used as a mold, glass, black metallurgy casting, powder metallurgy die, high temperature resistance furnace tube etc..
6, as a corrosion resistant material
Graphite is widely used to make hot water exchanger, reaction tank, condenser, burning tower, absorption tower, cooler, heater, filters and other equipment, widely used in petroleum, chemical, metallurgy, acid-base production, synthetic fiber, paper and other industries, can be a large number of metal saving.
7, application of atomic energy, defense industry
Graphite is one of the important structure materials of nuclear reactors, shielding materials and reflecting materials. Graphite but also for atomic reactors in the reducer, the son. For solid fuels by graphite in the defense industry, as the nozzle of the rocket, missile nose cone, aerospace equipment parts, insulation, anti radiation material etc.
8, as fuel
Cryptocrystalline low carbon graphite can be used as combustion for small oven, industrial boiler, brick, civil honeycomb briquette.
9, anti fouling, anti rust materials, steel welding material
Graphite can prevent boiler fouling, anti rust, welding of carbon steel casting filling etc.
10, other uses
Graphite can be used as a pencil core, pigment, polishing agent, catalyst, carbon, glass film coolant etc.
With the development of science, to study various physical properties of graphite will be more in-depth, utilization of graphite will be more widely. At present, American on graphite by using up to thousands of products, and our country is only hundreds, with the development of science and technology in China, graphite as special materials will play a greater role