Natural flake graphite has superior physical and chemical properties and is widely used in metallurgy, coatings and refractory industries. It is an important non-metallic raw material that is indispensable for today&#;s high-tech. Flake graphite is divided into large flake graphite and fine flake graphite according to the size of its scales. Usually, large flakes refer to +32 mesh, +50 mesh, +80 mesh, and +100 mesh flake graphite.
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Natural flake graphite is a kind of graphite, which belongs to pure natural graphite. The chemical and physical properties of natural flake graphite are better than artificial graphite. Therefore, more customers choose natural flake graphite. The following article will introduce natural flake graphite from several aspects so that everyone can understand all aspects of natural flake graphite
Flake graphite is a kind of natural phanerocrystalline graphite, which is in the shape of fish phosphorus. It belongs to a hexagonal crystal system and has a layered structure. It has good properties of high-temperature resistance, electrical conductivity, thermal conductivity, lubrication, plasticity, acid, and alkali resistance.
For example, 99.9% of C% 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.
Classification by particle size
When the particle size is smaller than that of W38, the graphite powder will be fine.
Flake graphite is widely used as a high-grade refractory and coating in the metallurgical industry. Such as magnesia carbon brick, the crucible, etc. Pyrotechnic materials stabilizer for military industry, the desulfurized accelerator for smelting industry, pencil lead for light industry, carbon brush for the electrical industry, an electrode for the battery industry, the catalyst for the chemical fertilizer industry, etc. After further processing, flake graphite can also produce graphite emulsion, which can be used as lubricant, release agent, wire drawing agent, conductive coating, etc. It can also produce expanded graphite, which can be used as raw materials for flexible graphite products, such as flexible graphite seals and flexible graphite composite products.
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Flake graphite, as a functional filler of coatings, is mainly used in anti-corrosive coatings, fireproof coatings, and conductive coatings.
As an anticorrosive material, the antirust primer made of carbon black, talc powder, and oil has good chemical and solvent corrosion resistance; If zinc yellow and other chemical pigments are added into the formula, the antirust effect is better.
Expandable graphite is a kind of graphite intercalation compound obtained by chemical or electrochemical treatment with natural graphite flakes as raw materials. Under the condition of the heating, the volume of expandable graphite expands rapidly (up to 300 times) to suffocate the flame. At the same time, it forms expansions, which can isolate the flame and delay or interrupt the flame spread. Moreover, it is nonflammable, has good softness, high surface energy, and good strength of the carbonized layer. But the volume and dosage of the expansion body should be selected appropriately. The results show that 150um particles, 30% expansion ratio, and 5% dosage are the most suitable.
The flake graphite can be directly used as a carbon conductive filler or composite conductive filler for conductive coatings. However, due to a large number of graphite flakes, the performance of the coating will become brittle and its application will be limited. Therefore, measures should be taken to further improve the conductivity of graphite and effectively reduce the number of graphite flakes. Tianhua Chemical Machinery Research Institute has developed high-temperature corrosion-resistant resin as binder, large solid graphite flakes with strong electrostatic conductivity as the main aggregate, high strength, and good wear resistance.
It is a solvent-free thick film conductive coating with chopped fiber material as a functional filler and good resistance to deformation and cracking. The coating has the characteristics of anti-corrosion medium penetration, small 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. It is reported that the composite conductive filler is prepared by electroless plating on graphite powder, such as copper, nickel, silver, etc., and 30% of it is used in the conductive coating, which does not only have good conductivity but also further improves the corrosion resistance.
HPMS Graphite offers a full line of graphite flake and graphite powder products. The purity of our flake graphite and powder ranges from 85% to 99.995% carbon. And the particle size ranges from 3 μm to 500 μm.
Graphite is widely used in various industries for more than 30 applications due to its unique properties and characteristics. Our high quality flake graphite and powder can be used as an engineering material over a wide range of applications: Refractory, lubricants, coatings, plastics and rubber additive, graphite foil, carbon brushes, paint, pencil, metallurgy, batteries, and fuel cell.
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