The advantage of graphite paper is that the carbon content is very high. From this, it can be seen that the conductive properties of graphite paper are developed due to the carbon content. Of course, there are other components in graphite paper, such as the chlorine content, which has exceeded 35, and the sulfur content, which has exceeded 300. From this content, we can see that the tensile strength of successfully produced graphite paper is very high, and its compression rate is also very good. We can freely expand and store graphite paper. In terms of use, it is also very convenient. Today I will reveal to you the principle of graphite paper conductivity and the relevant knowledge about why graphite paper can conduct electricity.
Introduction to graphite paper
Graphite paper: It is made of high-carbon phosphorus flake graphite through chemical treatment and high-temperature expansion and rolling. It is the basic material for manufacturing various graphite seals.
Uses of graphite paper
With the acceleration of the upgrading of electronic products and the growing demand for heat dissipation management of mini, highly integrated and high-performance electronic equipment, new electronic products have also been launched. New technology for product heat dissipation, namely a new solution for graphite material heat dissipation. This new natural graphite solution uses graphite paper to dissipate heat efficiently, take up little space, and is lightweight. It conducts heat evenly in two directions, eliminates "hot spots" areas, shields heat sources and components, and improves the performance of consumer electronics products.
Mainly used for sealing ring seals, mechanical seals, graphite strips, fillers, composite plates, cylinder gaskets, and basic materials for graphite seals.
Widely used in dynamic and static seals of machines, pipes, pumps, valves in electric power, petroleum, chemical industry, instrumentation, machinery, diamond and other industries. It is an alternative to traditional seals such as rubber, fluoroplastics, asbestos, etc. An ideal new sealing material.
The main uses of graphite paper application technology
It is used in notebook computers, flat panel displays, digital cameras, mobile phones and personal assistant devices.
Six major characteristics of graphite paper
1. Ease of processing of graphite paper: Graphite paper can be die-cut into different sizes, shapes and thicknesses, and die-cut flat plates can be provided with thicknesses Can be from 0.05 to 1.5m.
2. High temperature resistance of graphite paper: The highest temperature of graphite paper can reach 400℃, and the lowest temperature can be lower than -40℃.
3. High thermal conductivity of graphite paper: The in-plane thermal conductivity of graphite paper can reach a maximum of 1500W/mK, and the thermal resistance is 40% lower than aluminum and 20% lower than copper.
4. The flexibility of graphite paper: Graphite paper can be easily made into laminates with metal, insulation layers or double-sided tape to increase design flexibility and can have adhesives on the back.
5. The lightness and thinness of graphite paper: Graphite paper is 30% lighter than aluminum of the same size and 80% lighter than copper.
6. Ease of use of graphite paper: Graphite heat sinks can be smoothly attached to any flat and curved surface.
Graphite paper manufacturer
Ningbo Yinzhou Huaxin Seal Manufacturing Factory, main products or services: graphite products; graphite special-shaped processing; graphite powder; graphite base; graphite pouring tube ; Graphite paper; Graphite block; Crystallizer for copper materials; Various graphite crucibles; Graphite particles (carburizing agent); Graphite rods; Small graphite rods (5-19mm); Launder sheaths; Graphite and carbon products; Graphite Crushed; graphite balls; graphite heating element; is a manufacturer specializing in the production of graphite paper and other products, which are widely used in dynamic and static sealing of machines, pipes, pumps, valves in electric power, petroleum, chemical industry, instrumentation, machinery, diamond and other industries. , the product quality is excellent and can meet the application of graphite paper by different consumers.
Shanghai Luolai Graphite Products Materials Co., Ltd. mainly exports graphite paper. The graphite paper produced by this company has stronger sealing properties than other graphite papers and can replace rubber, fluoroplastics, asbestos, etc. An ideal new sealing material for traditional seals, it also eliminates "hot spot" areas, shields heat sources and components, and improves the performance of consumer electronics products.
Qingdao Heilong Graphite Co., Ltd. mainly produces and sells graphite paper. The graphite paper produced by the company is widely used in petroleum, chemical industry, electronics; toxic, flammable, high-temperature equipment or components. High temperature resistance, corrosion resistance and conductivity. Good performance. It can be made into various graphite strips, fillers, sealing gaskets, composite panels, cylinder gaskets, etc. With excellent product quality, it has always been the leader in the industry and is deeply loved by consumers.
Graphite paper production process
1. With the upgrading of electronic products, more and more mini, accelerated, highly integrated and other electronic devices are pouring into the electronics market. These electronic products If a certain heat dissipation effect is required, we can use graphite paper to solve the heat dissipation problem of products under high temperature conditions. It is widely used in dynamic and static sealing of machines, pipes, pumps and valves in electric power, petroleum, chemical industry, instrumentation, machinery, diamond and other industries. It is an ideal new sealing material to replace traditional seals such as rubber, fluoroplastics and asbestos.
2. Graphite paper is an expanded graphite product made from flake graphite under the action of nitric acid and hydrogen peroxide. Qingdao Huatai Graphite screens the graphite in a drying machine and puts it into a cyclone for 950°C Heating and expansion.
3. Then calendering multiple times according to different specifications to form graphite paper.
Why can graphite paper conduct electricity?
Because graphite contains freely moving charges, after electricity is applied, the charges move freely and form an electric current, so it can conduct electricity. The real reason why graphite conducts electricity is that 6 carbon atoms use 6 electrons to form a large ∏66 bond with 6 electrons and 6 centers. In the same layer of carbon rings in graphite, all 6-membered rings form ∏-∏* **yoke system, or in the same layer of carbon rings of graphite, all the carbon atoms form a huge large ∏ bond, and all the electrons in this large ∏ bond can flow freely within the layer, which is why graphite paper can conduct electricity The reason is.
Graphite has a lamellar structure, and there are unbonded free electrons between the layers, which can move in a direction after being energized. Virtually all materials conduct electricity, it's just a matter of resistivity. The structure of graphite determines that it has the smallest resistivity among carbon elements.
The conductive principle of graphite paper
Carbon is a tetravalent atom. On the one hand, just like the outermost electrons of metal atoms, which are easy to lose, the outermost electrons of carbon have fewer electrons, much like metals. Therefore, it has certain conductive properties. When pentavalent atoms of phosphorus and trivalent atoms of boron are infiltrated into it, corresponding free electrons and holes will be generated. In addition, carbon's outer electrons, which are easily lost, will move and fill holes under the action of potential difference. Produce a flow of electrons. This is the principle of semiconductors.
Electrical conductivity of graphite paper
Electrical and thermal conductivity: The electrical conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals. Thermal conductivity exceeds that of steel, iron, lead and other metal materials. The thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, graphite becomes a thermal insulator. Graphite can conduct electricity because each carbon atom in graphite only forms 3 positive valence bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transmit charge.