Product used-Pingdu City Yuan Xing Graphite processing plants-

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　　Graphite are carbon crystals, is a non-metallic materials, color silver gray, soft, with a metallic luster. Mohs hardness of 1 ~ 2, the proportion of 2.2 to 2.3, its density is generally 1.5 ~ 1.8.
Extremely high melting point of graphite, in vacuum to 3000 ℃ softening trend until the beginning of a molten state, to 3600 ℃ at the beginning of evaporation sublimation of graphite, the general strength of materials under high temperature gradually decreased, while the graphite in heated to 2000 ℃, its intensity rather than room temperature when the double, but the oxidation resistance of graphite as the temperature difference enhance oxidation rate gradually increased.

　　Graphite thermal conductivity and electrical conductivity is very high, and its high electrical conductivity than stainless steel 4-fold, high-carbon steel than 2-fold, than the average non-metallic high 100 times. Its thermal conductivity, not only over steel, iron, lead, metallic materials, and thermal conductivity with increasing temperature to lower, which is generally different metal materials, at very high temperatures, graphite and even tends to the adiabatic state. Therefore, in the ultra-high temperature conditions, the insulation properties of graphite are very reliable.

　　Graphite has good lubricity and plasticity, graphite friction coefficient is less than 0.1, graphite developable light into thin air, in the great hardness of high strength graphite, and diamond cutting tools are difficult to process.

　　Graphite has a chemical stability to acid, alkali, corrosion-resistant organic solvents. Graphite has unique because of the excellent performance of the above, in the increasingly widespread use of modern industry.

1, for refractory materials: Graphite and its products with a high temperature, high-intensity nature of the metallurgical industry is mainly used to manufacture graphite crucible, graphite in the steel used in the protective agent for steel ingot, metallurgical furnace lining.

2, for the conductive material: in the electrical industry for manufacturing electrodes, brush, carbon rod, carbon tubes, mercury converter is the cathode, graphite gaskets, phone parts, coatings, such as TV picture tubes.

3, for wear-resistant lubricating materials: graphite in the machinery industry often as a lubricant. Lubricants are often not in the high-speed, high temperature and high pressure under the conditions of use, and wear resistant graphite material can be (1) 200 ~ 2000 ℃ temperature in the high sliding speeds, lubricants do not work. Corrosion medium conveying much of the equipment, extensive use of graphite material piston cups, seals and bearings, they are running Needless to add lubricant. Graphite is also much metal processing milk (Roberts, SLIDE) when a good lubricant.

4, Graphite has good chemical stability. After special processing of graphite, with a corrosion-resistant, good thermal conductivity, low permeability, it is used extensively for the production of heat exchangers, the reaction trough, condensed, and the burning tower, absorption tower, chillers, heaters, filters , pumping equipment. Widely used in petrochemical, hydrometallurgy, acid production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.

5, for casting, foundry, die and high-temperature metallurgical materials: graphite because of the small coefficient of thermal expansion, and ability to quench hot radical changes, can be used as glass mold, the use of graphite black metal after the casting size to be precise, smooth surface yield high, not processed or minor processing can be used, thus saving a lot of metal. The production of cemented carbide and other powder metallurgy techniques, usually made of graphite material used in die and sintering boat. Silicon crystal growth crucible, regional refining container, frame clamp, induction heaters are used by the processing of high-purity graphite. Addition of graphite can also be vacuum smelting graphite insulation panels and base, high temperature resistance furnace furnace tube, rod, plate, grid components, such as sheds.

6, for the atomic energy industry and defense industry: graphite has a good agent for neutron deceleration of atomic reactors, uranium-graphite reactors is one more application of a nuclear reactor. Used as the driving force of the deceleration of atomic energy reactors should have a high melting point materials, stability, corrosion-resistant performance, graphite fully meet those requirements. As atomic purity graphite reactors used in demanding, impurity content should not exceed a few dozen PPM. Boron content in particular, should be less than one of 0.5PPM. In the defense industry also used graphite to create solid-fuel rocket nozzles, missile nose cones, space equipment, spare parts, insulation materials and anti-rays Materials.

7, graphite can prevent boiler scaling, the unit tests showed that in the water add a certain amount of graphite powder (per ton of water used around 4 ~ 5 grams) to prevent fouling of boiler surfaces. In addition graphite coated metal chimneys, roofs, bridges, pipelines can be anti-rust anti-corrosion.

8, graphite pencil can be used for batteries, pigments, polishing agent. Graphite through special processing beyond the production of special materials can be used in the relevant industrial sector.

　　Such as non-permeability graphite, directional high-density graphite, graphite fiber cloth and so on.

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