2022-11-23
2023-05-22Graphite is a kind of homogenous alien in element carbon. Each carbon atom is connected to the other three carbon atoms (multiple hexagonal sixtures with honeycomb -shaped hexagonal) with covalent bonds to form covalent molecules. [1] Because each carbon atom will release an electron, those electrons can move freely, so graphite is a conductive body. Graphite is one of the softest minerals, and its purpose includes a pencil core and lubricant. Carbon is a non -metal element that is located in the second cycle IVA family located in the element cycle table. Latin is Carbonium, which means "coal, charcoal".The melting point of diamond is 3823K, and the melting point of graphite is 3773K. Graphite melting points are lower than diamonds. The melting point of graphite and diamond cannot be considered simply from the aspects of the key energy. If the number of broken keys during melting is ignored, the data obtained is not desirable
2023-05-22In the metallurgical industry, natural scales can be used to produce refractory materials such as magnesium carbon bricks and aluminum carbon bricks due to better antioxidant properties. Artificial graphite can be used as a steelmaking electrode, and the electrodes made of natural graphite are difficult to use to use the steelmaking electric furnaces with strict conditions.In the machinery industry, graphite materials are usually used for wear -resistant and lubricating materials. The lubrication of natural scales graphite is better, which is often used as additives for lubricating oil. The device that transports the corrosive medium is widely used by artificial graphite pistons, sealing rings and bearings. There is no need to add lubricating oil during work. Natural graphite and polymer resin composite materials can also be used in the above fields, but wear resistance is not as good as artificial graphite.In the chemical industry, artificial graphite has the characteristics of corro
2023-05-19Whether it plays an important role in the growth of KISH graphite or the growth of KISH graphite according to layer -like crystal, oxygen is an important role. Practice has proved that when the co -crystal iron fluid is exposed to the air, the KISH graphite is easy to form; turning the iron solution and the update surface can exacerbate the precipitation of KISH graphite. The action of oxygen is to form SiO2 as the base of KISH graphite nucleus. The temperature of the iron liquid temperature at below 1400 ° C is severe than high temperature because of SiO2, which is unstable above 1400 ° C. The precision phenomenon of KISH graphite cannot be seen in the low Si or Si iron liquid, which shows that the existence of SIO2 has an impact on the formation of KISH graphite that cannot be ignored.The cooling speed is the basic process conditions formed by the formation of KISH graphite when the existence of oxygen (such as hydrogen protection). KISH graphite can only be formed at a lower coolin
2023-05-19The crystal features of KISH graphite are manifested as layer -shaped branches crystal structure, as shown in Figure 1. When the front C is observed, the graphite hexagonal ring is almost overlapped and has branches, and the graphite A direction remains connected.Kishh graphiteFrom the KISH graphite inside the melt, first assembled in the fuse, and then floated to the surface of the liquid to form a volume knot. The KISH graphite directly generated from the surface is assembled on the surface.
2023-05-191. Refractory material: use graphite, smelting colors, special steel and other valuable metals such as graphite, smelting colors, special steel, etc. in the metallurgical industry, as a magnesium carbon brick in the steel refining furnace; in addition, it is also used as a steel insulation, protective residue and steel bag covering agent.2. Conductive material: Graphite can be used as electrodes, brushes, electrical rods, carbon pipes, and visual tube coatings on the electrical industry.3. Abrasion -resistant materials and lubricants: It can be used for wear -resistant and lubricating materials in the mechanical industry. For example, graphite can slide at a speed of 100m/s at a temperature range of -200-2000 ° C, without lubricating oil. Graphite lubricants include oil agents, water, powder colloidal graphite, graphite lubricating fat, graphite root roots, etc.4. Sealing materials: Use flexible or expanded graphite as lyric axes, water turbines, gas turbines, and piston ring cushions
2023-05-17Graphite is one of the deceleration materials and reflective materials used in nuclear reactors. Early reactors are graphite heaps. The nuclear reactor for structural materials use graphite using raw materials, process control, and finished product inspection than graphite electrodes. The nuclear reactor must have the following performance with graphite , High heat shock, good deceleration performance to fast neutron, stable size under radiation, and very small impurities. Boron, cadmium and other elements that are easy to absorb neutron should be strictly controlled.Nuclear graphite must have a high volume density M because the deceleration of graphite on fast neutron is relying on the collision effect of fast neutron to carbon atoms. One of the main indicators of nuclear graphite M is also directly related to the pore rate and penetration rate of graphite. In order to avoid the loss of nuclear fuel and heat carrier, M should reduce the pores and penetration rates to a certain level.
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