High quality powder raw carbon brush Graphite 50mesh High-Carbon Expandable/Dilatable Graphite Powder
Natural Graphite For Carbon Brush
There are three kinds of raw materials for making brushes,
one is metal powder,
the other is carbon and graphite powder, the other is binder. Because of the different working conditions of the motor, there are many kinds of brushes. The technical performance of different brands of brushes is very different. Therefore, adjustments need to be made in the process.
Performance: Complete scale crystallization, excellent physical and chemical properties, uniform particle size distribution, small sparks during the production of carbon brushes, good high temperature resistance, thermal conductivity, thermal shock resistance, wear resistance, iron, copper, and molybdenum etc...
The ingredients of the formula include:
1) Particle size composition of dry powder;
2) Choose different raw materials and their proportions;
3) Types, properties and proportions of adhesives. Many raw materials are used in the manufacture of brush, which have different material structure and characteristics. Mixing the different properties of these raw materials in a certain proportion will obtain a comprehensive effect completely different from that of a single raw material. The particle size composition of dry powder will affect its bulk density. Due to the difference of overlapping between particles, different degrees of pores (pores) will be produced. The finer the particles are, the larger the surface area is, and more adhesives are needed.
| Model No. | Fixed Carbon (≥) | Particle size | Moisture content |
| -399 | 99 | Under sieve 325 Mesh ≥ 85% | 0.3 |
| -398 | 98 | | Under sieve 325 Mesh ≥ 85% |
| 0.3 |
| -395 | 95 | | Under sieve 325 Mesh ≥ 85% |
| 0.3 |
| -299 | 99 | | Under sieve 200 Mesh ≥ 90% |
| 0.3 |
| -298 | 98 | Under sieve Mesh 200 ≥ 90% | 0.3 |
| -295 | 95 | Under Sieve Mesh 200≥ 90% | 0.3 |
Graphite powder has high purity, uniform particle size small, high surface activity, Graphite powder with melting point of 3850 ± 50 ºC, boiling point of 4250 ºC,even after ultra-high temperature electric arc burning, weight loss is very small.Lubricating,Chemical stability,High temperature resistance,conductive coating ,Leakage resistance.
Physical Characters :
Item | Unit | 0.8mm HNJH-1 | 0.8mm -2 | 2.0mm -1 | 2.0mm -2 |
Electric Resitivity | μΩm | ≯12 | ≯8.5 | ≯12 | ≯9 |
Bulk Density | g/cm³ | ≮1.58 | ≮1.70 | ≮1.58 | ≮1.70 |
Compressive strength | Mpa | ≮19 | ≮35 | ≮19 | ≮30 |
Bending Strength | Mpa | ≮7.8 | ≮13.5 | ≮7.8 | ≮13 |
As Content | % | ≯0.3 | ≯0.3 | ≯0.3 | ≯0.3 |
C.T.E | 10 -6 /ºC | ≯2.0 | ≯2.2 | ≯2.0 | ≯2.2 |
Note: Graphite according to customers' requirements.
Our quality is equivalent to European standards. |
Colloidal graphite powder is formed by graphite particles less than 2 μ m evenly dispersed in organic solvent. Colloidal graphite is a kind of black wire viscous suspension liquid. It has the properties of high-quality natural flake graphite, special oxidation resistance, self lubrication and plasticity at high temperature, as well as good conductivity, heat conduction and adhesion. It is mainly used in sealing, metallurgical demoulding and other industries.
Second, flake graphite powderFlake graphite powder is the most widely used raw material for processing other graphite powder. Its specifications range from 30 mesh to 800 mesh. Flake graphite powder has good toughness, thermal conductivity and corrosion resistance. It can be used as conductive material, refractory, wear-resistant lubricating material, casting, turning sand, die and high-temperature metallurgical material.
Third, nano graphite powderThe main specification of nano graphite powder is d50400nm, its production process is more complex, the yield is low, so the price is relatively high, mainly used in anti-corrosion coatings, lubricating oil additives, grease additives, precision graphite sealing and other industries.
Fourth, superfine tonerThe specifications of ultra-fine graphite powder range from 1800 mesh to 8000 mesh. It is mainly used as demoulding agent for powder metallurgy, graphite crucible, battery anode and additive for conductive materials.
Details Images:
Applications:
1.) Electronic Materials
2.) Powder Metallurgy
3.) Lubricating Materials
4.) Conductive Materials
5.) Pencil Lead Graphite can be divided into natural graphite and artificial graphite. Natural graphite comes from graphite deposits, and natural graphite can also be divided into flake graphite, earthy graphite and massive graphite. The graphite obtained from natural mining contains many impurities, so it needs to be beneficiated to reduce the impurity content before it can be used. The main use of natural graphite is to produce refractories, brushes, flexible graphite products, lubricants, anode materials for lithium-ion batteries, etc. some carbon products are sometimes added with a certain amount of natural graphite.
It can be used as antiwear agent and lubricant. High purity graphite can be used as neutron retarder in atomic reactor. It can also be used to make crucible, electrode, brush, dry cell, graphite fiber, heat exchanger, cooler, electric arc furnace, arc lamp, pencil lead, etc.
Characteristics of graphite powderFirst, high temperature resistance: the melting point of graphite is 3850 ± 50 ºC, the boiling point is 4250 ºC, even after ultra-high temperature arc burning, the weight loss is still very small, and the coefficient of thermal expansion is also very small. The strength of graphite will be strengthened with the increase of temperature. At 2000 ºC, the strength of graphite will be doubled.
Second, conductivity and thermal conductivity: the conductivity of graphite is 100 times higher than that of ordinary non-metallic minerals, and its thermal conductivity is higher than that of steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature. At very high temperature, graphite will become an insulator.
Third, lubricity: the lubricity of graphite depends on the size of graphite scale. The larger the scale is, the smaller the friction coefficient is, the better the lubricity is.
Fourth, chemical stability: graphite at room temperature has good chemical stability, can resist acid, alkali and organic solvent corrosion.
Fifth, plasticity: graphite has good toughness and can be made into very thin sheets.
Sixth, thermal shock resistance: when graphite is used at room temperature, it can withstand the drastic change of temperature without damage. When the temperature changes suddenly, the volume of graphite changes little, and there will be no cracks.
More Usage :
First, in industry
1. The specially processed graphite powder has the characteristics of corrosion resistance, strong thermal conductivity and low permeability. It can be used to make heat exchanger, reaction tank, condenser, combustion tower, absorption tower, cooler, heater, filter and pump equipment.
2. Widely used in petrochemical, hydrometallurgy, acid-base production, synthetic fiber, paper and other industrial sectors, can save a lot of metal materials.
3. As casting, sand, die and high temperature metallurgical materials.
4. Due to its small coefficient of thermal expansion and its ability to withstand drastic temperature changes, graphite can be used as a mold for glassware. After using graphite, ferrous metal castings can be obtained with accurate size, smooth surface and high yield of finished products. It can be used without processing or slight processing, saving a lot of metal.
5. In the production of cemented carbide and other powder metallurgy processes, graphite materials are usually used to make moulds and porcelain boats for sintering.
6. Graphite can be used as graphite insulation board and base, high temperature resistance furnace tube, rod, plate, grid and other components for vacuum smelting.
7. Graphite can be applied to metal chimneys, roofs, bridges and pipelines to prevent corrosion.
8. Graphite is also an indispensable raw material for making pencils, ink, black paint, ink, synthetic diamonds and diamonds.
9. In the electrical industry, it can be used as a conductive material for manufacturing electrodes, brushes, carbon rods, carbon tubes, positive electrodes of mercury positive current devices, graphite gaskets, telephone parts, coatings of TV picture tubes, etc.
Second, in terms of national defense
1. It is used in atomic energy industry and national defense industry.
2. In the national defense industry, graphite is also used to make solid fuel rocket nozzles, missile nose cones, aerospace equipment parts, heat insulation materials and anti radiation materials.
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