What is the Difference Between Graphite and Graphene?

Jun. 29, 2021

As a Graphite Electrodes Supplier, share it with you. Ordinary graphite is formed by stacking layers of planar carbon atoms arranged in a honeycomb pattern. Graphite rods are often used as electric heating elements in high-temperature vacuum furnaces. The maximum operating temperature can reach 3000°C. It is easy to oxidize at high temperatures. Except for vacuum, it can only be used in neutral or reducing atmospheres. Its thermal expansion coefficient is small, thermal conductivity is large, resistivity is (8~13)×10-6 Ω·m, processability is better than SiC, MoSi2 rod, high temperature resistance, extreme cold and extreme heat resistance, good price. 

Graphite Electrodes

Graphite Electrodes

Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder, and are made through calcination, batching, kneading, pressing, roasting, graphitization, and machining. It releases electric energy in the form of an electric arc in an electric arc furnace. The conductors that heat and melt the charge can be classified into ordinary power, high power and ultra-high power according to their quality indicators. Graphite electrodes mainly include four types of ordinary power graphite electrodes, anti-oxidation coating graphite electrodes, high-power graphite electrodes and ultra-high-power graphite electrodes. Graphite block is a kind of artificial graphite, and artificial graphite is made by artificial heating of coke products. Generally, if it is purified to make high-purity or carbon fiber, the added value is high. The interlayer force of graphite is weak, and it is easy to exfoliate each other to form thin graphite sheets.

When the sheet is stripped into a single layer, the single layer with the thickness of only one carbon atom is graphene. This appeared in the laboratory in 2004 when two British scientists AndreJem and Kostya Novoselov discovered that they could use a very simple method. To get thinner and thinner graphite flakes. They peeled off the graphite sheet from the graphite, then glued both sides of the graphite sheet to a special tape, peeled off the tape, and split the graphite sheet in two. It has been working like this, so the flakes are getting thinner and thinner, and the flakes they get in the end have only one layer of carbon atoms, which is graphene. Graphene has proven to be the thinnest and hardest material in the world. Another feature of graphene is that its conductive electrons can not only move unimpeded in the crystal lattice, but also move very fast, far exceeding the speed of electrons moving in metal conductors or semiconductors. In addition, its thermal conductivity exceeds all known substances.

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