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Natural Flake Graphite
Natural Flake Graphite
Graphite is a crystalline form of carbon, a non-metallic material, silver color, soft, having a metallic luster. Mohs hardness 1 to 2, a specific gravity of 2.2 to 2.3, its density is generally 1.5 to 1.8.
High melting point of graphite in vacuum to 3000 ℃ begins to soften when a molten state tends to graphite sublimation 3600 ℃ begins to evaporate, decreasing common material strength at high temperatures, whereas graphite was heated to 2000 deg.] C, which double strength but relatively normal temperature, but the oxidation resistance of graphite oxidation rate increase as the temperature difference is gradually increased.
Thermal and electrical conductivity of graphite is quite high, which is 4 times higher electrical conductivity than stainless steel, carbon steel than 2 times, 100 times higher than the general non-metallic. Its thermal conductivity, not only over steel, iron, lead, a metal material, and the thermal conductivity decreased with increasing temperature, which is generally different metal materials and, at very high temperatures, the graphite tends to even adiabatic state. Therefore, in the ultra-high temperature, thermal insulation properties of graphite is very reliable.
Graphite has good lubricity and plasticity, graphite friction coefficient is less than 0.1, gas-permeable graphite may develop into the light transmitting sheet, the high strength graphite great hardness, even with diamond tools are difficult to process.
Graphite is a crystalline form of carbon, a non-metallic material, silver color, soft, having a metallic luster. Mohs hardness 1 to 2, a specific gravity of 2.2 to 2.3, its density is generally 1.5 to 1.8.
High melting point of graphite in vacuum to 3000 ℃ begins to soften when a molten state tends to graphite sublimation 3600 ℃ begins to evaporate, decreasing common material strength at high temperatures, whereas graphite was heated to 2000 deg.] C, which double strength but relatively normal temperature, but the oxidation resistance of graphite oxidation rate increase as the temperature difference is gradually increased.
Thermal and electrical conductivity of graphite is quite high, which is 4 times higher electrical conductivity than stainless steel, carbon steel than 2 times, 100 times higher than the general non-metallic. Its thermal conductivity, not only over steel, iron, lead, a metal material, and the thermal conductivity decreased with increasing temperature, which is generally different metal materials and, at very high temperatures, the graphite tends to even adiabatic state. Therefore, in the ultra-high temperature, thermal insulation properties of graphite is very reliable.
Graphite has good lubricity and plasticity, graphite friction coefficient is less than 0.1, gas-permeable graphite may develop into the light transmitting sheet, the high strength graphite great hardness, even with diamond tools are difficult to process.
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The main technical characteristics depending on it's graphite crystal form. Different crystalline mineral form of graphite, and having a value different industrial uses. Industrially, depending on crystal forms, natural graphite is divided into three categories as below: dense crystalline graphite block graphite, flake graphite and amorphous graphite graphite aphanitic.
our graphitebelongs to flake graphite. The carbon content of ore is > 13%. After the flotation process, the fixed carbon content is 95% ± 1%. The following three kinds of particle sizes are available: 1. 100 mesh => 195 2. 80 mesh => 895 3. 50 mesh => 595 4. 30 mesh => 395 |
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Graphite has a chemical stability to acid, alkali, corrosion resistance of the organic solvent.Because graphite has more unique excellent performance, increasingly widespread use in modern industry.
1. For the refractory material: graphite article having properties of high temperature and high strength, is mainly used in the metallurgical industry for producing graphite crucible, commonly used in the steel ingot of graphite as a protective agent, lining metallurgical furnace.
2. As the conductive material: in the electrical industry for the production of coatings and other electrodes, the positive brushes, carbon rod, carbon tubes, positive flow of mercury, graphite gaskets, telephone parts, television picture tube.
3. As the wear-resistant lubricating material: graphite as a lubricant in mechanical industry often. Lubricants often can not be used at a high speed, high temperature and high pressure conditions, and wear-resistant material may be graphite at high sliding speeds, without working at a temperature of the lubricating oil (a) 200 ~ 2000 ℃ in. Many corrosive media delivery devices, widely used graphite material piston cups, seals and bearings, the lubricating oil when they are added Needless operation. Colloidal graphite are many well metalworking lubricant (Roberts, trombone).
4. Graphite has good chemical stability. Specially processed graphite, resistant to corrosion, thermal conductivity, and low permeability, it is used extensively for production of the heat exchanger, a reaction tank, a condenser, a combustion tower, absorption tower, a cooler, a heater, a filter, pump equipment. Widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal material.
5. For casting, foundry, dies and high temperature metallurgical materials: the thermal expansion graphite has a low coefficient withstand thermal shock of the changes can be used as the mold glass filter, the use of graphite ferrous metal to give casting precise size, smooth surface yield high, with little or processing without processing can use, thus saving a lot of metal. Production of cemented carbide powder metallurgy process, usually a graphite die and sintered material used in boat. The single-crystal silicon crystal growth crucible, zone refining vessel, the support clamp, an induction heater, etc. are processed with high-purity graphite. Further vacuum smelting graphite can be made and the base plate of graphite insulation, high-temperature resistance furnace tubes, rods, plates, sheds and other cell components.
6. For the nuclear industry and defense industry: graphite having a good neutron moderator for the nuclear reactor, the uranium-graphite reactors is currently the more an atomic reactor. As with the nuclear reactor power in moderating material should have a high melting point, stability, corrosion properties, graphite fully meet the above requirements. As graphite nuclear reactor with high purity, impurities should not exceed tens of PPM. In particular the boron content should be less than 0.5PPM. Is also used for producing solid fuel rocket nozzle graphite in the defense industry, the nose cone of the missile, space travel equipment parts, insulating material and anti-radiation material.
7. Graphite also to prevent boiler scaling graphite, the units tests showed that adding a certain amount of graphite powder in water (per ton of water with about 4 to 5 grams) can be prevented from fouling the surface of the boiler. Further graphite coated on the metallic chimneys, roofs, bridges, pipelines can corrosion and rust.
8. Graphite pencil lead can be used, a pigment, a polishing agent. Graphite after special processing, can produce a variety of special materials for the relevant industrial sectors.
1. For the refractory material: graphite article having properties of high temperature and high strength, is mainly used in the metallurgical industry for producing graphite crucible, commonly used in the steel ingot of graphite as a protective agent, lining metallurgical furnace.
2. As the conductive material: in the electrical industry for the production of coatings and other electrodes, the positive brushes, carbon rod, carbon tubes, positive flow of mercury, graphite gaskets, telephone parts, television picture tube.
3. As the wear-resistant lubricating material: graphite as a lubricant in mechanical industry often. Lubricants often can not be used at a high speed, high temperature and high pressure conditions, and wear-resistant material may be graphite at high sliding speeds, without working at a temperature of the lubricating oil (a) 200 ~ 2000 ℃ in. Many corrosive media delivery devices, widely used graphite material piston cups, seals and bearings, the lubricating oil when they are added Needless operation. Colloidal graphite are many well metalworking lubricant (Roberts, trombone).
4. Graphite has good chemical stability. Specially processed graphite, resistant to corrosion, thermal conductivity, and low permeability, it is used extensively for production of the heat exchanger, a reaction tank, a condenser, a combustion tower, absorption tower, a cooler, a heater, a filter, pump equipment. Widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal material.
5. For casting, foundry, dies and high temperature metallurgical materials: the thermal expansion graphite has a low coefficient withstand thermal shock of the changes can be used as the mold glass filter, the use of graphite ferrous metal to give casting precise size, smooth surface yield high, with little or processing without processing can use, thus saving a lot of metal. Production of cemented carbide powder metallurgy process, usually a graphite die and sintered material used in boat. The single-crystal silicon crystal growth crucible, zone refining vessel, the support clamp, an induction heater, etc. are processed with high-purity graphite. Further vacuum smelting graphite can be made and the base plate of graphite insulation, high-temperature resistance furnace tubes, rods, plates, sheds and other cell components.
6. For the nuclear industry and defense industry: graphite having a good neutron moderator for the nuclear reactor, the uranium-graphite reactors is currently the more an atomic reactor. As with the nuclear reactor power in moderating material should have a high melting point, stability, corrosion properties, graphite fully meet the above requirements. As graphite nuclear reactor with high purity, impurities should not exceed tens of PPM. In particular the boron content should be less than 0.5PPM. Is also used for producing solid fuel rocket nozzle graphite in the defense industry, the nose cone of the missile, space travel equipment parts, insulating material and anti-radiation material.
7. Graphite also to prevent boiler scaling graphite, the units tests showed that adding a certain amount of graphite powder in water (per ton of water with about 4 to 5 grams) can be prevented from fouling the surface of the boiler. Further graphite coated on the metallic chimneys, roofs, bridges, pipelines can corrosion and rust.
8. Graphite pencil lead can be used, a pigment, a polishing agent. Graphite after special processing, can produce a variety of special materials for the relevant industrial sectors.
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SMB INT'L Co., Ltd.
Address : NO.119, Nanhai 6th St., JI - AN, HUALIEN, 97355, TAIWAN, R.O.C. Mobile: 886-927-712-502 FAX : 886-3-8421-391 E-mail 1: [email protected] E-mail 2 : [email protected] Skype : truman02010201 |
