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Introduction to flake graphite knowledge

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Introduction to flake graphite knowledge  | TRUNNANO
 
Flake graphite is natural crystalline graphite shaped like fish phosphorus, belongs to the hexagonal crystal system, and has a layered structure. It has good high-temperature resistance, electrical conductivity, thermal conductivity, lubrication, plasticity and acid and alkali resistance.
Flake graphite is a natural solid lubricant with a layered structure, rich in resources and low in price.
Flake graphite has complete crystals, thin flakes, good toughness, excellent physical and chemical properties, good thermal conductivity, electrical conductivity, thermal shock resistance, corrosion resistance, etc.
Classified by carbon content
For example, C%>99.9% is high purity graphite; 94%<C%<99% is high carbon graphite; 80%<C%<94% is medium carbon graphite; 50%<C%<80% is low carbon graphite.
Flake graphite is widely used in advanced refractories and coatings in the metallurgical industry. Such as magnesia carbon bricks, crucibles, etc. Stabilizers for pyrotechnic materials in the military sector, desulfurization accelerators for the smelting industry, pencil leads for the light industry, carbon brushes for the electrical industry, electrodes for the battery industry, catalysts for the fertilizer industry, etc. After intensive processing of flake graphite, graphite emulsion can be produced, used in lubricants, mold release agents, wire drawing agents, conductive coatings, etc. It can also produce expanded graphite, which is used as raw material for flexible graphite products, such as flexible graphite seals and flexible graphite composite products.
coating
As a functional filler of coatings, flake graphite is mainly used for anti-corrosion coatings, fire-resistant coatings and conductive coatings.
As an anti-corrosion material, it is made of carbon black, talcum powder and oil, etc. with good corrosion resistance to chemicals and solvents; if chemical pigments such as zinc yellow are added to the formulation, the anti-rust effect is better.
Expandable graphite is used as a fireproof filler, a kind of graphite interlaminar compound obtained by chemical or electrochemical treatment with natural graphite flakes as raw materials. Expandable graphite expands rapidly (up to 300 times) in volume under heating, suffocating the flame. Simultaneously, it generates expansions to isolate the love, delay or interrupt the flame spread, and it is non-combustible, flexible, and has high surface energy. The strength of the carbonized layer is good. However, the volume and dosage of the expansion body should be selected appropriately. Tests show that 150um particles, 30% expansion ratio, and 5% dosage are the most suitable.
Flake graphite can be directly used as a carbon-based conductive filler or can be made into a composite conductive filling for conductive coatings. However, due to many graphite flakes added, the coating's performance will become brittle, and its application will be limited. Therefore, measures have been taken to improve graphite conductivity and effectively reduce the number of graphite flakes added. The domestic Tianhua, Chemical Machinery Research Institute, has developed a high-temperature corrosion-resistant resin as the base material. Large flake solid graphite flakes with strong electrostatic conductivity as the primary aggregate, with high body strength and good wear resistance.
The short-cut fiber material with good resistance to deformation and cracking is a solvent-free thick film conductive coating with a functional filler. The layer has the characteristics of anti-corrosive medium penetration, low curing residual stress, good resistance to matrix deformation and cracking, stable construction performance, and long-term static electricity conduction. It can be used for electrostatic conductive coating on the inner wall of the crude oil storage tank. According to reports, the electroless plating technology is used to coat graphite powder with metals, such as copper, nickel, silver, etc., to prepare composite conductive fillers, which are used in conductive coatings in an amount of 30%, which has not only good conductivity but also has further corrosion resistance. Improve.

The difference between graphite and graphene

Graphite electrode related knowledge and its application fields

Expandable graphite 

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