Natural flake graphite is natural crystalline graphite, which is shaped like fish phosphorus, belongs to the hexagonal crystal system, and has a layered structure. It has good high temperature resistance, electrical conductivity, heat conduction, lubrication, plasticity, acid and alkali resistance.
Flake graphite has complete crystals, thin flakes, good toughness, excellent physical and chemical properties, and good thermal conductivity, electrical conductivity, thermal shock resistance, corrosion resistance, etc.
Natural Flake Graphite Application
Refractory
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 industry, 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, which can be 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, the anti-rust primer made of natural phosphorous flake graphite and carbon black, talcum powder and oil has good corrosion resistance to chemicals and solvents; if chemical pigments such as zinc yellow are added to the formulation, it will prevent rust.
Natural phosphorous flake graphite is used as a fireproof filler is expandable graphite, which is a kind of graphite interlaminar compound obtained by chemical or electrochemical treatment of natural graphite flakes as raw material. Expandable graphite expands rapidly (up to 300 times) in volume under heating, which suffocates the flame, and at the same time generates expansions, which can isolate the flame and delay or interrupt the spread of the flame. It is incombustible, has good flexibility, and has high surface energy, the strength of the carbonized layer is good.
Flake graphite can be used directly as a carbon-based conductive filler, or it can be made into a composite conductive filler for conductive coatings. However, due to the large amount of graphite flakes added, the performance of the coating will become brittle and its application will be limited. Therefore, measures are taken to further improve the conductivity of graphite and effectively reduce the amount of graphite flakes added.
The short-cut fiber material with good resistance to deformation and cracking is a solvent-free thick film conductive coating with functional fillers. The coating 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. Natural phosphorous flake graphite can be used for electrostatic conductive coating on the inner wall of crude oil storage tanks.
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 not only has good conductivity, but also the corrosion resistance is further improved.
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