Brief introduction of silicon carbide products

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Introduction to silicon carbide products
Silicon carburide also known by the names moissanite or emery is an inorganic material with a formula of SiC. It is produced by melting quartz sand with wood chips, coke or petroleum coke. In nature, silicon carbide is found in the rare mineral moissanite. It is the most popular and cost-effective refractory material among the non-oxide materials like C, N, and B. It can also be called refractory or gold steel. In China, silicon carbide is made up of two types: green and black. They are both hexagonal crystals and have a specific gravity ranging from 3.20 to 3.25.

Both black silicon carburide and green silica carbide belong to the aSiC. Black silicon carbide has a SiC content of 95% and is more durable than green silicon carbide. It is used primarily for materials that have low tensile strengths, like glass, ceramics or stone. Green silicon carbide has a SiC content of over 97% and is self-sharpening. It is used primarily for the processing of cemented carbide (a titanium alloy), optical glass and titanium alloy. Also, it can be used to fine grind high-speed steel and for honing and grinding cylinder liners. There is also a cubic silicon-carbide, a yellowish-green crystal, prepared through a special method. The abrasive tools used to make them are suitable for superfinishing bearings. Surface roughness is processed between Ra320.16microns and Ra0.040.02 microns.

Aside from being an abrasive, silicon carbide can be used in many other ways. This is due to its chemical stability, high thermal conductivity (low thermal expansion coefficient), and wear resistance. The powder of silicon carbide can be used to coat a specific impeller, cylinder or other part of a turbine. The inner wall of the refractory can be improved to increase its resistance to abrasion and its life span by upto 2 times. Low-grade Silicon carbide (containing approximately 85% SiC), which is an excellent Deoxidizer and can improve steel quality, speed up the steelmaking process and allow for better control of chemical composition. In addition, silicon carbide can be used to produce silicon carbide for electric heater elements.
It is the second hardest substance in the world, after diamonds (10). It is a good thermal conductor, a semiconductor that can resist oxidation even at high temperatures.

There are at least 70 crystal forms of silicon carbide. Allomorphs of silicon carbide are the most common. It has a hexagonal crystalline structure and is formed above 2000 degC at high temperatures. b Silicon Carbide has cubic crystals, similar to a diamond. The network can be seen on the page. It is a more attractive catalyst because of the higher surface area. A type of silicon carburide called m-silicon is more stable and makes a nicer sound when it collides. However, until now these two types had not been used commercially.
Due to its high sublimation temp (approximately 27°C) and 3.2g/cm3 specific weight, silicon carbide makes a great raw material for bearings and high-temperature ovens. It does not melt at any pressure, and it has a very low chemical activity. Its high thermal conductivity and breakdown electric field strength as well as its high maximum current densities have led many to try to replace silicon when it comes to high-power semiconductor components. It has a high coupling effect to microwave radiation.
The colorless silicon carbide produced in industrial production is caused by iron impurities. The silica coating on the surface of the crystal gives it a rainbow-like appearance. To

Pure silicon carbide is a transparent, colorless crystal. The impurities in industrial silicon carbide cause it to be light yellow or green. It can also be blue, black, or dark brown. Its clarity varies according to its purity. The cubic b-SiC is also known as cubic silicon carbide. The different stacking of silicon and carbon atoms creates a variety of a SiC variants. Over 70 types have been identified. bSiC is transformed into aSiC at temperatures above 2100degC. Industrial silicon carbide is produced by refining petroleum coke and high-quality sand in a resistance oven. The silicon carbide blocks that have been refined are then crushed and subjected to acid-base washing, magnetic separation, sieving, or water selection in order to obtain products with different particle sizes.
It is artificial because silicon carbide has a low natural content. The standard method is to combine quartz sand, coke with silica or petroleum coke. Add salt and wood chips and heat to 2000degC in an electrical furnace.
Its excellent hardness has made it an indispensable abrasive, but its range of applications goes beyond that of general abrasives. Due to its thermal conductivity and high-temperature resistance, it is a popular choice for kiln furniture in tunnel kilns. The electrical conductivity of this material makes it a vital electric heating element. SiC pellets are also known as emery because of their high C content and super-hardness. It is not natural emery, also known as garnet. In the industrial production of SiC, quartz, petroleum coal, etc. is usually used. As raw materials, as auxiliary recovery material, or as spent materials. After grinding or other processes, the materials are blended to a charge that has a reasonable particle size and ratio to adjust its gas permeability. An appropriate amount must be added. To prepare green silicon carbide at high temperatures, you need to add the correct amount of sodium chloride. Special silicon carbide electric heaters are used for the thermal equipment to prepare SiC smelting at high temperatures. Its main components are the furnace bottom with electrodes in the interior, the sidewall that can be removed, and the furnace core. Both ends of this furnace are electrode-connected. In this electric oven, the firing method is known as buried-powder firing. As soon as you turn it on, the heating begins. The core of the furnace can reach temperatures as high as 2600degC. SiC synthesizes at 1450degC (though SiC mainly forms above 1800degC), and co is released. SiC decomposes when the temperature is >=2600. The decomposed si, however, will form SiC and C in the charged.
Each electric heater is equipped with transformers. Even so, during production only one electric heater is operated to adjust voltage in accordance with the electrical load characteristics and maintain constant power. The high-power furnace must be heated for around 24 hours. The reaction that generates SiC stops after an interruption in power. After a cooling time, the sidewalls can be removed. The charge is then gradually removed. Silicon carbide can be divided up into many different categories. These are divided according to their use environment and more often than not, silicon carbide is used in machinery. Silicon carbide seal rings can, for example, be used to seal mechanical seals. These seal rings can be further divided into flat ring or moving ring. Our silicon carbide products can also be made in different shapes according to the customer’s requirements. For example, we can produce silicon carbide plates and rings.
One of the silicon-carbide products is silicon carbide, which has high hardness, corrosion resistance and high temperature strength. Silicon carbide ceramics have a wide range of applications.
Silicon carbide ceramics are ideal for seal rings. They have a high level of chemical resistance and wear resistance. The friction coefficient of silicon carbide ceramic is smaller when combined with graphite than alumina and cemented carbide. Therefore, it can be used to produce PV values that are higher, particularly in conditions where strong acids or alkalis will be transported. The SIC-1 atmospheric sintered silicon carbide products manufactured by our company are characterized by high density and high hardness. Large production batches can be produced, as well as products of complex shapes. They are ideal for sealing applications requiring high-performance, with high PV values. The SIC-3 materials produced by our company contain graphite. When combined with other materials, the friction coefficient of silicon carbide is low because it contains fine dispersed graphite particles. It is self-lubricating and therefore ideal for air-tight, dry-friction sealings. It is used to increase the seals’ service life, and improve the reliability of the work.

After high-temperature calibration, furnace charges are unreacted materials (to preserve heat in the furnace), silica carbide oxycarbide material (semi reactive material), and carbonates of Fe, Al Ca Mg. The binder layer is used to bond the very tight material. It is composed of C, SiO2, Fe, Al Ca Mg Carbonate, 60% to 70% SiC. The unreacted and a small part of oxycarbide layers are usually collected and used as spent materials. A large part of this material is also collected along with amorphous and second-grade products, as well as a small part of the bonding material. Large lumps, tight bonds and impurities such as charges are discarded. First-grade product is classified and then coarsely or finely crushed. It’s then chemically processed, dried and sieved. Then it is magnetically separated and transformed into various size black and green SiC particles. It is necessary to go through the water selection process in order to produce silicon carbide.

( Tech Co., Ltd. ) is an Silicon carbid professional manufacturer with 12 years’ experience in chemical research and product development. Contact us to send a request for Titanium Dioxide.