Time：2023.11.10Browse：1
Graphite is one of the substances with the highest melting and boiling points in nature, with a melting point of 3850 ± 50 ℃ and a boiling point of 4500 ℃. However, the boiling points of silicate minerals are all below 2750 ℃ (quartz boiling point), and the boiling point of graphite is much higher than the boiling point of the impurity silicate it contains. This characteristic is the theoretical basis for high-temperature purification of graphite. Fill the graphite powder directly into a graphite crucible and heat it in a purification furnace filled with inert gas and Freon protective gas to 2300-3000 ℃ for a period of time. Impurities in the graphite will overflow, thus achieving the purification of the graphite. The high-temperature method generally uses high carbon graphite containing over 99% carbon purified by flotation or chemical methods as the raw material, which can purify the graphite to 99% 99%. By further improving the process conditions and improving the quality of the crucible, the purity can reach 99% More than 995%.
The high-temperature method can produce over 99.99% ultra-high purity graphite, but it requires the fixed carbon of the raw material to be above 99%. Moreover, the equipment is expensive, the investment is huge, and the production scale is limited. The electric furnace heating technology requires strict isolation of air, otherwise the graphite will start to oxidize when heated to 450 ℃ in hot air. The higher the temperature, the greater the loss of graphite. Only special industries with very high requirements for graphite quality (such as national defense, aerospace, etc.) use high-temperature method to produce high-purity graphite in small batches.
2023-12-11Raw material quality: The main raw material for graphite crucibles is natural graphite, and its quality is closely related to the service life of graphite crucibles. High quality natural graphite has the characteristics of high density, high purity, and high strength, which can extend the service life of graphite crucibles.
Raw material cost: The price of graphite molds is influenced by the cost of raw materials. The main raw material for graphite molds is graphite material, and its price fluctuations will directly affect the price of graphite molds. The rise or fall in raw material prices can lead to fluctuations in graphite mold prices.
We all know that graphite has excellent chemical stability. After special processing, graphite also has the characteristics of corrosion resistance, good thermal conductivity, and low permeability. Therefore, it is widely used as heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, and pump equipment.
The main difference between graphite and graphene lies in their structure. Graphite is a two-dimensional material with a hexagonal lattice formed by carbon atoms, and is an allotrope of carbon. And graphene is a type of material composed of carbon atoms in the form of sp ² A two-dimensional carbon nanomaterial with a hexagonal honeycomb lattice composed of hybrid orbitals is a single-layer structure of graphite. Therefore, graphite can be seen as a stacked form of graphene.Graphene has some unique physical and chemical properties, such as excellent conductivity and thermal conductivity, high strength, high toughness, etc., making it have broad application prospects in energy, materials, electronics and other fields. Due to its structure, graphite mainly has excellent lubrication and wear resistance, and is commonly used in the manufacturing of lubricants and wear-resistant materials.Although there are significant differences in structure and properties between graphite and graphene, t2023-12-12The main factors affecting the price of graphite molds are as follows
2023-12-11The Future Market Prospects of Graphite Powder
2023-12-07The difference and connection between graphite and graphene
2023-12-12There are weak van der Waals forces between layers in the structure of graphite, and these interactions are disrupted under high temperature conditions, leading to interlayer detachment of graphite.
Skin graphite, as a functional filler for coatings, is mainly used for anticorrosive coatings, fireproof coatings and conductive coatings. As an anticorrosive material, it is a rust -proof primer made of charcoal black, talc powder and oil. It has good chemical resistance and solvent resistance. If you add chemical pigments such as zinc yellow to the formula, the rust -proof effect will be better.Scales graphite manufacturers believe that expansion graphite can be used as fireproof fillers. It is a graphite layer compound obtained by natural graphite thin slices as raw materials. Under heating conditions, the volume of expansion graphite quickly expands (300 times) to suffocate the flame, and at the same time, the expansion substance can be isolated, which can be isolate the flames, delay or interrupt the spread of flames, not burning, good flexibility, high surface energy, charcoal layer strength strength good. However, the volume and dosage of the expansion body should be appropriat2023-07-17The function and characteristics of scales graphite
Haifeiling owns domestic advanced technology, equipment and high-level R D team, and is committed to creating well-known brand trademarks of Haifeiling products
4008-168-001
