The main use of graphite products

Graphite products can release far infrared rays after heating.

Magnesium-carbon brick Magnesium-carbon refractory is the middle of the era, developed by the United States, the Japanese steelmaking industry began to use magnesium-carbon brick for water cooling arc furnace smelting. Magnesia-carbon bricks have been widely used in steelmaking worldwide and have become a traditional use of graphite. At the beginning of the decade, magnesium-carbon bricks began to be used for the lining of oxygen top-blown converter.

Aluminum carbon brick aluminum carbon refractory materials are mainly used in continuous casting, flat steel billet self-positioning pipeline fort cover, underwater nozzle and oil well blasting cylinder. Steel produced by continuous casting in Japan accounts for more than the total production.

Crucible and related products made of graphite molding and refractory crucible and related products, such as crucible, curved neck bottle, plug and nozzle, etc., have high fire resistance, low thermal expansion, melting metal process, by metal infiltration and erosion is also stable, good thermal shock stability at high temperature and excellent conductivity, Therefore, graphite crucible and its related products are widely used in the process of direct melting of metal. The traditional graphite clay crucible is manufactured with a carbon content greater than the scale graphite, usually the graphite scale should be larger than the mesh (- screen), and the important improvement in foreign crucible production technology is that the type of graphite used, scale size and quality have greater flexibility followed by the use of silicon carbide graphite crucible instead of the traditional clay graphite crucible. This is due to the introduction of constant pressure technology in the steelmaking industry. The use of constant pressure technology can also make small scale graphite can be applied, in the clay graphite crucible, and in the silicon carbide graphite crucible, the content of large scale components only accounts for, and the carbon content of graphite is reduced to.

steelmaking

Graphite and other impurity materials can be used as carburizers in the steelmaking industry. Carburizing uses a wide range of carbonaceous materials, including artificial graphite, petroleum coke, metallurgical coke and natural graphite. Graphite is still one of the main uses of earth-like graphite in the world.

Conductive material

Graphite is widely used in the electrical industry as electrodes, brushes, carbon rods, carbon tubes, mercury rectifiers, graphite gaskets, telephone parts, television picture tube coating and so on. Among them, graphite electrode is the most widely used, in the smelting of various alloy steel, iron alloy, the use of graphite electrode, then a strong current through the electrode into the furnace melting zone, generate an arc, so that electric energy into heat energy, the temperature rises to about, so as to achieve the purpose of melting or reaction. In addition, when electrolyzing magnesium, aluminum and sodium, the anode of the electrolytic cell also uses a graphite electrode. Graphite electrode is also used as the conductive material of the furnace head for the production of abrasive resistance furnaces. The graphite used in the electrical industry has high requirements for particle size and grade. Such as alkaline batteries and some special electric carbon products, the graphite particle size is required to be controlled within the scope of the project, the grade is above, and harmful impurities (mainly metal iron) are required to be below. The graphite used in the TV picture tube has the following particle size requirements. Graphite is often used as a lubricant in the machinery industry. Lubricating oil often can not be used under high speed, high temperature, high pressure conditions, and graphite wear-resistant materials can work without lubricating oil at - temperature and at a very high sliding speed. Many corrosive media conveying equipment, widely used graphite materials made of piston rings, seals and bearings, when they run, do not need to add lubricating oil, graphite milk is also a good lubricant for many metal processing (wire drawing, tube drawing).

Corrosion-resistant material

Graphite has good chemical stability. Specially processed graphite has the characteristics of corrosion resistance, good thermal conductivity and low permeability, and is widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, pumps and other equipment. These equipment are used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials. 0 For casting, sanding, pressing and high-temperature metallurgical materials due to the small expansion coefficient of graphite, and the ability to change cold and heat, can be used as a glass mold, after the use of graphite, the black metal castings obtained accurate size, smooth surface, high yield, can be used without processing or slightly processed, thus saving a lot of metal. The production of carbide and other powder metallurgy processes, usually made of graphite materials for pressure resistance to sintering of boats. Monocrystalline silicon crystal growth crucible, regional refining vessel, bracket, fixture, induction heater, etc., are processed with high purity graphite. In addition, graphite can also be used as vacuum metallurgy graphite insulation plate and base, high temperature resistance furnace furnace tube, rod, plate, grid and other components.

Atomic energy

Graphite has a good neutron deceleration performance, the first as a moderator used in atomic reactors, uranium-graphite reactor is a more widely used atomic reactor. As a power for atomic energy reactor deceleration material should have a high melting point, stability, corrosion resistance, graphite can fully meet the above requirements. The purity of graphite used as an atomic reactor is very high, and the impurity content should not exceed dozens (one part per million), especially the content of boron should be less than.

Anti-fouling and anti-rust material

Graphite can prevent boiler scaling, the relevant unit tests show that adding a certain amount of graphite powder in water (about per ton of water) can prevent scale on the boiler surface. In addition, graphite applied to metal chimneys, roofs, Bridges, pipelines can be anti-corrosion and anti-rust.

Other uses

With the continuous development of science and technology, people have developed many new uses for graphite. Flexible graphite products. Flexible graphite, also known as expanded graphite, is a new graphite product developed in the 1990s. The United States successfully researched flexible graphite sealing materials to solve the leakage problem of atomic energy valves, and then Germany, Japan and France also began to develop and produce. In addition to the characteristics of natural graphite, this product has special flexibility and elasticity. Therefore, it is an ideal sealing material. Widely used in petrochemical, atomic energy and other industrial fields. The international market demand is increasing year by year.

High purity products are used in high purity metal smelting, electronics industry, nuclear industry and mold manufacturing; Common products are used in aluminum electrolysis tank, powder metallurgy sintering furnace, ferroalloy furnace and other mineral furnace masonry materials.

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