What characteristics should be paid attention to in the selection of graphite materials?

Founded in 2001, Chengdu Atech Specialty Graphite is a company specializing in carbon graphite processing. Our business philosophy is clear, that is, we will continue to focus on the processing and manufacturing of carbon graphite products now and in the future, providing reliable and high-quality carbon graphite products to customers in the following key industrial fields. - Photovoltaic, electronics and semiconductors - High temperature and vacuum electric furnace - Traditional industry (such as non-ferrous metallurgy, mold making, glass quartz, (glass) optical fiber, electrolysis (plating), cement, synthetic diamond tools, etc.) - Automobile and machinery field (such as manufacturing mechanical seals, vacuum pumps and compressors, etc.) - Carbon graphite for electrical engineering (such as carbon brushes for motors, grounding devices for locomotives, carbon slide plates for pantographs, etc.).

Graphite is a widely used material in our lives, even in ancient times, graphite has been used, so graphite also has a certain historical origin. And in modern times.

Especially in today's education popularization and the development of science and technology, graphite, whether it is used as a pen or an important experimental material, is widely used and widely known in our society, so do you know how to choose graphite, which is so popular now? Let me tell you how graphite materials are chosen.

1.The choice of graphite material should first look at the average size of the particle diameter of the material:

Whether the diameter of the particles of the material is average enough or not can directly affect the condition of the graphite material. In particular, the discharge condition of graphite materials is closely related to the average degree of particle diameter of the material. In addition, the more average and smaller the particles of the graphite material, the more stable the final discharge condition of the graphite material will be, and of course, the surface quality of the graphite material will be better.

2.The choice of graphite material depends on the flexural strength of the material

In addition to the average particle size of the material, the material selection of graphite materials also requires the material to have good strength in terms of bending resistance, because the bearing capacity of the material for bending can very intuitively reflect whether the material has the appropriate strength to become a graphite material.

3.The inherent resistance of the material.

Rate:

Because there are some places that have special requirements for graphite materials, in many cases, under the condition that the particles of the material are average and the same, the graphite material with high resistivity finally becomes a graphite material that is much slower than the material with low resistivity, and most of the time, the discharge speed of graphite material is required to be good, so the inherent resistivity of the material has a great impact on the selection of graphite materials.

4.It is also necessary to look at the shore hardness of the material:

The texture of graphite is actually harder than many metals, and graphite materials are actually very easy to cut, so in the selection of materials, it is necessary to explore the shore hardness of the material itself.

After a detailed explanation of the choice of graphite materials, do you already have some understanding of how to choose graphite materials, it seems that graphite is very common in the streets and alleys, in the selection of materials, there are so many requirements, in fact, it is not so strange. Because, the more popular things can be popularized, the choice of materials actually contains many simple and complex procedures. In the future, when you use graphite-related materials, you can naturally think of the choice of materials, which is also interesting.

Graphite materials are mainly composed of polycrystalline graphite, which is an inorganic non-metallic material, but it is called a semi-metal because it has good thermal and electrical conductivity.

Graphite has higher thermal and electrical conductivity than some metals, and at the same time has a much lower coefficient of thermal expansion than metals, a high melting point and chemical stability, which makes it of great value in engineering applications.

Graphite has very good corrosion resistance and does not react with any organic compounds.

Graphite is an allotropic form of the element carbon, in which three other carbon atoms (arranged in a honeycomb-like hexagon) are connected to each carbon atom around each other to form a covalent molecule. [1]

Since each carbon atom emits an electron, which can move freely, graphite is a conductor of electricity.

Graphite is one of the softest minerals, and its uses include making pencil leads and lubricants. Carbon is a non-metallic element that is located in the second period of the periodic table, group iva.

Graphite is a non-metallic material.

Graphite is an allotropic form of carbon, which is a gray-black opaque solid with stable chemical properties and corrosion resistance, and is divided into natural flake graphite, earthy graphite and artificial graphite. Graphite is used as the basic raw material, after simple preliminary processing, graphite can be reprocessed to make graphite powder of various specifications. Graphite has lubricity, high temperature resistance, electrical conductivity, etc., and can be directly applied in the field of lubrication.

Graphite has quite high thermal and electrical conductivity, and its electrical conductivity is 4 times higher than that of stainless steel, 2 times higher than carbon steel, and 100 times higher than that of general non-metals. Its thermal conductivity not only exceeds that of steel, iron, lead and other metal materials, which is different from general metal materials, and the thermal insulation performance of graphite is very reliable under high temperature conditions.

The role of graphite

1. As a conductive material

In the electrical industry, it is used as a positive electrode for the manufacture of electrodes, brushes, carbon rods, carbon tubes, mercury rectifiers, graphite washers, ** parts, and coatings for TV picture tubes.

2. Chemical stability

Graphite processed by Teki Zhaoshu has the characteristics of corrosion resistance, good thermal conductivity and low permeability, so it is widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, cold loss swimmers, heaters, filters, and pump equipment. It is widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, papermaking and other industrial sectors, which can save a lot of metal materials.

Due to its special structure, graphite has the following special properties:

1) High temperature resistance: the melting point of graphite is 3850 50, the boiling point is 4250, even if it is burned by ultra-high temperature arc, the weight loss is very small, and the thermal expansion coefficient is also very small. The strength of graphite increases with temperature, and at 2000, the strength of graphite doubles.

2) Electrical and thermal conductivity: The electrical conductivity of graphite is 100 times higher than that of general non-metallic minerals. Thermal conductivity exceeds that of metallic materials such as steel, iron, and lead.

The thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, graphite becomes an insulator. Graphite is able to conduct electricity because each carbon atom in graphite forms only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transport the charge.

3) Lubricity: The lubricating performance of graphite depends on the size of the graphite flakes, the larger the flakes, the smaller the friction coefficient, and the better the lubrication performance.

4) Chemical stability: Graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.

5) Plasticity: Graphite has good toughness and can be milled into very thin sheets.

6) Thermal shock resistance: graphite can withstand drastic changes in temperature without damage when used at room temperature, and when the temperature changes abruptly, the volume of graphite changes little and will not cause cracks.

You can write just one or all of them.

1. Gray-black opaque.

2. High temperature resistance.

3. Graphite has good chemical stability at room temperature, and can resist acid and salt resistance and organic solvent corrosion.

4. Graphite has good toughness and can be milled into very thin flakes.

It's easy. Give it a thumbs up, love you, Momoda.

China is a big country of natural graphite resources, with reserves, output and exports ranking first in the world, but due to the lack of manufacturing technology and technology development capabilities, it is still dominated by raw material production and processing of low value-added flake graphite, while the flexible graphite industry of the United States, Japan, Germany and France is in the leading position in the world. In 1963, the United States was the first to successfully develop and successfully carried out practical working conditions experiments on atomic valves, which attracted the attention of all countries in the world, and has been widely used in industrial production in the 70s. Flexible graphite is an ideal sealing material, commonly known as "sealing king", with good mechanical, physical and chemical properties.

According to the different crystalline forms, natural graphite can be divided into three categories: cryptocrystalline graphite, dense crystalline graphite and flake graphite, among which, flake graphite has superior floatability, lubricity and plasticity than other types of graphite, so it has the greatest industrial value. Expanded graphite is made from natural graphite flakes.

Natural graphite is treated with a strong oxidizing mixed acid to form a so-called interlayer compound - graphite oxide. Graphite oxide is heated and decomposes to release carbon dioxide and other gases, if it is an instantaneous high temperature, it rapidly decomposes and expands (its expansion degree can be 100 300 times that of the original), forming a loose, soft and flexible substance, that is, expanded graphite, which is called flexible graphite after pressure molding. It not only retains the characteristics of graphite, but also overcomes the shortcomings of natural graphite that it is brittle and brittle, and has poor impact resistance.

After the expansion of graphite loose, porous and curly, similar to a caterpillar, called a worm, its surface area is large, the surface energy is high, the adsorption capacity is strong, no binder is required, only mechanical processing can make the worms adsorb each other, chimeric and combined, and processed into various shapes of seals, which is the self-viscosity of expanded graphite. The larger the expansion factor, the better its self-adhesiveness and the higher the quality of the pressed seal.

Graphite is composed of the element carbon.

Answer: CS graphite modified cement-based composite insulation board is called carbon silicon board, and it will also be called CS board. Carbon-silicon board is made of ordinary Portland cement, high-quality mineral powder, adding carbon fiber, silicone, inorganic foaming agent and other additives, using advanced production equipment and foaming technology through special technology to make inorganic fireproof and thermal insulation board.

Hope it helps, dear.

Graphite is an allotrope of carbon, which is gray-black, opaque solid, chemically stable, corrosion-resistant, and not easy to react with acids, alkalis and other agents.

Natural graphite, as the name suggests, is naturally formed graphite in nature, generally appearing in graphite schist, graphite gneiss, graphite-containing schist and metamorphic shale and other ores. The process performance and use of graphite are mainly determined by its crystallization degree, and natural graphite can be divided into two industrial types: crystalline graphite (flake graphite) and cryptocrystalline graphite (soil-like graphite) according to its crystalline form.

According to incomplete statistics, the world's natural graphite reserves are about 2 billion tons, of which about 800 million tons of crystalline graphite, China's natural graphite reserves rank first in the world, and the total reserves of crystalline graphite ore are 100 million tons.

History

China has formed a comprehensive natural graphite industry with mining, beneficiation, processing, purification and product series. China is the world's largest producer of natural graphite, with natural graphite production reaching 10,000 tons in 2009, accounting for about 55% of the world's total output, ranking first in the world.

In April 2015, the domestic natural graphite market was steadily declining, with a decline of about 5%, and industry insiders said that the cost of lithium battery anode is expected to decline. In the early 20th century, the technology of making batteries and pencils from graphite was introduced to China, and graphite, which was called "thermal coal" and "pen pencil at that time", began to be used in modern industry, promoting the development of China's graphite mining industry.