Characteristics And Application Range Of Graphite Materials

Carbon materials are inorganic non-metallic materials mainly composed of carbon elements. Carbon materials are basically composed of non graphitic carbon, while graphite materials are mainly composed of graphitic carbon. Graphite can be divided into natural graphite and artificial graphite.
Graphite material is mainly composed of polycrystalline graphite. Graphite is a layered crystal with a hexagonal plane grid between carbon atoms. Although graphite is an inorganic non-metallic material, it is called a semi metal because of its good thermoelectric conductivity. Graphite has higher thermoelectric conductivity than some metals, and also has a far lower thermal expansion coefficient than metals and high chemical stability, which makes it valuable in engineering applications. Graphite is chemically inert in non oxidizing media and has good corrosion resistance. Except for strong acid and strong oxidizing media, graphite is not subject to corrosion of other acids, alkalis and salts and is not compatible with any organic compounds.
Graphite material is also a kind of high temperature resistant material. Graphite will not melt at high temperatures. The gasification temperature is very high, but 3350 18 starts to sublimate into gas under normal pressure. Generally, the strength of materials decreases gradually at high temperature, while the strength of graphite increases with the temperature when it is within 2500 'C. When it is above 2000 ℃, its strength is twice that of normal temperature. Graphite materials also have excellent thermal shock resistance, so graphite materials have unique advantages as high-temperature materials.
Graphite material has become an indispensable structural material, high-temperature material, conductive material, wear-resistant material and functional material in the development of national economy because of its high temperature strength, conductive heat transfer, thermal shock resistance, corrosion resistance, good lubrication and other advantages. At present, graphite materials have been widely used in metallurgy, chemical industry, electronics, electrical appliances, machinery, nuclear energy, aerospace industry and other sectors, and can be used as electrodes, electrolytic anodes, molds and high-temperature bearings; Surface coating used as neutron deceleration material and nuclear fuel in nuclear reactor; In the aerospace field, graphite materials can be used for artificial satellite antennas, space shuttle casings, rocket generator nozzle throat liners and other components.