Thermal conductivity of carbon graphite

The thermal conductivity of carbon graphite is one of the most important thermal and moisture physical parameters of mechanical materials, and is closely related to machines, environments and many other thermo-humid processes. The thermal conductivity of carbon graphite is 151 w/(m·k). Thermal conductivity refers to the heat transfer through 1 square meter area in 1 second for a 1m thick material with a temperature difference of 1 degree on both sides of the material under stable heat transfer conditions, the unit is W/(m·K).

Various indices of carbon graphite

Carbon graphite is a crystalline form of carbon. Hexagonal crystal system, iron ink to dark gray. The density is 2.25 g/cm3, the hardness is 1.5, the melting point is 3652 °C, and the boiling point is 4827 °C. The texture is soft, creamy and conductive. Chemically inactive, corrosion-resistant, not easy to react with acids and alkalis. Intensified heat in air or oxygen can burn and produce carbon dioxide. Strong oxidants will oxidize it to organic acids. Used as anti-friction agent and lubricating material, making crucible, electrode, dry battery, pencil lead. High-purity carbon graphite can be used as a neutron moderator in nuclear reactors. Often referred to as charcoal or black lead, because it was previously mistaken for lead.

Thermal and electrical conductivity of carbon graphite

The thermal conductivity and electrical conductivity of carbon graphite are quite high, and its electrical conductivity is 4 times higher than that of stainless steel, 2 times higher than that of carbon steel, and 10 times higher than that of ordinary non-metals. Its thermal conductivity not only exceeds that of metal materials such as steel, iron, and lead, but also decreases with the increase of temperature, which is different from general metal materials. At extremely high temperatures, carbon graphite even tends to adiabatic state.

Therefore, under ultra-high temperature conditions, the thermal insulation performance of carbon graphite is very reliable. Different substances have different thermal conductivity; the thermal conductivity of the same substance is related to its structure, density, humidity, temperature, pressure and other factors. When the water content of the same substance is low and the temperature is low, the thermal conductivity is small. Generally speaking, the thermal conductivity of carbon graphite as a solid is greater than that of a liquid, which in turn is greater than that of a gas. This difference is largely due to the difference in molecular spacing between the two states.

Application of carbon graphite with good thermal conductivity

Carbon graphite material is usually called thermal insulation material, and materials with thermal conductivity below 0.05 W/(m·K) are called high-efficiency thermal insulation materials. Substances with high thermal conductivity have excellent thermal conductivity. When the heat flux density and thickness are the same, the temperature difference between the high temperature side wall surface and the low temperature side wall surface of the material decreases with the increase of thermal conductivity. Carbon graphite on the market is now used in large quantities to make heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, and pump equipment. It is widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, papermaking and other industrial sectors, which can save a lot of metal materials.

The mechanical or electronic market continues to develop and become stronger, and thermally conductive materials are indispensable accessories in electronic products, such as thermally conductive carbon graphite. In fact, carbon graphite is a brand-new thermal conductivity and heat dissipation material. The future market needs materials with better thermal conductivity, which saves a lot of metal materials and resources. The Franli factory mainly produces carbon graphite, which has excellent thermal conductivity and good electrical conductivity, and can be widely used in various industries.