What Are The Applications Of High Purity Graphite
If the 20th century were the age of silicon, carbon would be one of the fastest-growing and most widely used materials of the 21st century. Lithium battery anode materials, graphene materials, isotropic nuclear graphite, synthetic diamond, flexible graphite, and other advanced carbon are playing an increasingly important role in people's life, production, and military affairs.
High purity graphite refers to graphite powder containing more than 99.9% carbon, high purity graphite of high carbon content, such high purity graphite has good conductivity, lubrication, high-temperature resistance, wear resistance, etc.
The use of high purity graphite in the field of industrial production has excellent performance. High purity graphite is used in conductive, lubrication, metallurgy, and other industrial production fields. High purity graphite production, from the beginning of the raw materials, should be strictly controlled the content of impurities, choose low ash raw materials, and in the production process to prevent the increase of pollutants as far as possible. However, the reduction of contaminants to the degree required is primarily in the graphite chemical sequence. Graphitization occurs at high temperatures, where the oxides of many impurity elements will decompose and evaporate. The higher the graphitization temperature is, the more impurities are discharged, the higher the purity of the high purity graphite products are produced. The high purity graphite is used to make use of its excellent conductivity, lubrication, high-temperature resistance, etc.
High purity graphite is a high purity, fewer impurities. This depends on the complete production process and production equipment.
Special properties of graphite
1.High-temperature resistance: Graphite melting point is 3850± 50℃, the boiling point is 4250℃, even after ultra-high temperature arc burning, weight loss is minimal, the thermal expansion coefficient is insignificant. With the increase of temperature, the strength of graphite increases At 2000℃, the power of graphite is doubled.
2.Conductivity, thermal conductivity: The conductivity of graphite than the general non - metallic ore 100 times higher. The thermal conductivity exceeds that of steel, iron, lead, and other metallic materials. The thermal conductivity decreases with temperature, and even at very high temperatures, graphite becomes adiabatic. Graphite conducts electricity because each carbon atom in graphite forms only three Covalent bonds with other carbons, each of which remains one free electron to carry the charge.
3. Lubricity: the lubrication performance of graphite depends on the size of graphite scales, the larger the scale, the smaller the friction coefficient, the better the lubrication performance.
4.Chemical stability: Graphite in the room temperature has excellent chemical durability, acid resistance, alkali resistance, and resistance to organic solvent corrosion.
5.Plasticity: Graphite toughness is good, can be ground into a fragile sheet.
6. Thermal shock resistance: Graphite in the room temperature when used to withstand the dramatic changes in temperature without destruction, temperature mutation, the volume of graphite changes little, will not produce cracks.
(1)Lithium battery industry
Natural graphite and artificial graphite are the primary sources of graphite anode materials. Artificial graphite generally needs to go through calcination, carbonization, high-temperature graphitization, coating, and other technological processes; Natural graphite is mostly purified by alkali acid dressing, ultra-high temperature purification, surface, and other processes.No matter natural graphite or artificial graphite must undergo graphitization or wash at high temperature, to become a cathode material for lithium battery production. At present, high-temperature graphite purification technology, high-temperature graphitization technology, has become the key technology in the research field of graphite anode materials.
Compared with various preparation methods of graphene, graphite oxide reduction method will become the most promising and promising method to synthesize graphene and its materials. The primary raw material of graphite oxide reduction method is high purity natural flake graphite.
(3)Isotropic nuclear graphite industry
Because high purity isotropic natural microcrystalline ink is an ideal raw material for atomic graphite, it is particularly important to expand the source of raw materials for high purity isotropic natural microcrystalline ink.
(4) Artificial diamond industry
Natural flake graphite powder is the primary raw material of synthetic diamond. Scientists have proved that the purity of graphite powder and the graphitization degree of graphite powder have a significant influence on product quality. The selection of high purity graphite raw materials and the selection of appropriate graphitization degree will be an essential way to improve the product quality of an artificial diamond.
(5) Military graphite bomb industry
High purity graphite is the raw material for producing graphite bombs.
(6) Flexible graphite industry
To sum up, flexible graphite has a unique use value and broad development prospect. But in the production process, there are purity requirements, chemical acid purification often destroys or affect the excellent material properties, high-temperature physical refinement has apparent advantages.
(7) Other trades
Natural high purity graphite powder has the advantages of high-temperature resistance, good electrical and thermal conductivity, lubricity, chemical stability, excellent wear resistance, can be used as synthetic crystalline silicon carbide and boron carbide raw materials, hidden aircraft coating and chemical industry, electronics, machinery, and other industrial fields, has an extensive range of applications.
To sum up, the high purity graphite powder market has a broad prospect. It is urgent to provide a large number of high-quality, high purity graphite powder for the market.