Graphene is a kind of carbon material with high specific surface area and wide application potential. It has remarkable superiority over other products in specific capacity, cost and life. Its raw materials are mainly related to product types and preparation methods.
For example, the raw materials of mechanical stripping, epitaxy growth and graphite oxide reduction are flake graphite
, in which flake graphite is more conducive to the formation of graphene, while the raw materials of graphene film prepared by vapor deposition are carbon-containing gases, which have nothing to do with graphite.
2. Expanded graphite
As a new type of functional carbon material, expanded graphite (EG) is a porous and porous worm-like material made from natural graphite scales by intercalation, washing, drying and high-temperature expansion. It is necessary to use large scale graphite to make EG. Fine grains can not be used or are difficult to use.
In addition to the excellent properties of natural graphite such as heat and cold resistance, corrosion resistance and self-lubrication, it also has the characteristics of softness, compression resilience, adsorption, ecological environment coordination, biocompatibility and radiation resistance that natural graphite does not have. It can be used as fire retardant filler, medical dressing and flexible graphite as sealing material.
3. Graphite Anode Battery Materials
Graphite is the most widely used anode material for lithium ion batteries because of its excellent electrical conductivity, which is 100 times higher than ordinary non-metallic ores. Both flake graphite and artificial graphite can be used as anode materials for batteries. They have their own advantages, but earth graphite can not be used as anode materials for graphite batteries because of its low capacitance.
has many advantages, such as low price, high electronic conductivity, high diffusion coefficient of lithium ion, high embedding capacity and low embedding potential. However, its application threshold is high, and it requires high processing environment and technology for enterprises. It is mainly used in the field of mobile phones and camera batteries in China, while Shenzhen Bertley Company is one of the application enterprises. Artificial graphite has a high price, but its application threshold is low, and its processing technology is not high. At present, it is also developing rapidly. In a word, there are both crystalline graphite and artificial graphite in cell phones and camera batteries, and their proportion is similar.
has excellent thermal shock resistance and slag erosion resistance. It also has high temperature resistance and high strength after being manufactured. It is widely used in high-grade refractories and coatings of gold industry, such as protective agent for steel ingot, lining of metallurgical furnace, magnesia-carbon brick, crucible and so on. However, it should be noted that flake graphite
is best used in crucible manufacturing.
5. Lubricating materials
The good lubricity of graphite materials comes from the crystal structure of graphite. Among them, the lubricity of large flake graphite is better than that of fine flake graphite. The bigger the graphite scale is, the lower the friction coefficient will be, the better the lubricity will be. Flake graphite is often used as lubricant in mechanical industry. Graphite emulsion produced by deep processing is a good lubricant in many metal processing (wire drawing, pipe drawing).
In addition, the use of lubricating oil at high speed, high temperature and high pressure will be greatly discounted, while graphite wear-resistant materials can work without lubricating oil at temperatures of 200-2000 C and high speed. Graphite material is also widely used to make piston cups, sealing rings and bearings in many equipment for conveying corrosive media, so that lubricants are not needed in operation.
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