Manufacturing process of synthetic graphite


What is graphite?

Flexible graphite – expanded or exfoliated graphite – is produced from purified natural graphite flakes. In manufacturing, the flakes are mixed with a highly oxidizing acid to produce graphite intercalation compounds. A sudden application of high temperature expands these. The resulting product expanded graphite, is mechanically compressed into shaped products, mainly graphite foil. Although still showing the unique properties of natural graphite, e.g. its excellent conductivity, expanded graphite foil is also flexible, soft and easy to process in contrast to the raw material.


Application areas of graphite

Electronic applications: In electronic applications, synthetic graphite is mainly used in semiconductor and solar technology. In semiconductor technology, fine-grain graphite of the highest purity is required, for example, as graphite mouldings coated with silicon carbide (SiC), which are used as susceptors for the silicon epitaxy of thin silicon wafers. So-called single crystal pulling equipment also features graphite components, such as the graphite hollow cylinder, the supporting crucible, the heat shield, the power connector and mounting parts. Heating elements made of high-purity graphite are also required for resistance-heated furnaces in semiconductor production.


Manufacturing process of synthetic graphite

The manufacturing processes for synthetic graphite are comparable to those for ceramic materials. The solid raw materials coke and graphite are ground and mixed in mixing units with carbonaceous binders such as pitches to form a homogeneous mass. This is followed by shaping. Various processes are available: isostatic pressing, extrusion, vibration, or die moulding. The pressed "green" bodies are then heated under the exclusion of oxygen at about 1000 °C. During this process, binder bridges are formed between the solid particles. Graphitization – the second thermal processing step – converts the amorphous carbon into three-dimensionally ordered graphite at about 3000 °C. The graphitized moulded parts are then mechanically processed into complex components. Additional cleaning processes and coating steps, such as silicon carbide (SiC) coating, can further refine these.


Why does the lead pencil contain graphite

The lead pencil has been used in many countries since the 17th century. At that time, however, the graphite used for writing was still considered lead ore, which incorrectly gave rise to the name "lead pencil". A pencil doesn't contain lead – until today, it is made of a graphite-clay mixture. Writing and drawing can be done well with a pencil because graphite leaves a grey deposit on surfaces like paper. A pencil stroke is, therefore, a thin graphite deposit.


Price of graphite

Graphite particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Graphite. A large amount of large amount will be lower. The Price of graphite is on our company's official website.


Graphite supplier

Mis-Asia is a reliable and high-quality global chemical material supplier and manufacturer. It has over 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including graphite, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective graphite, you are welcome to contact us or inquire any time.

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