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Introduction to silicon carbide products
Silicon carburide also known by the names moissanite, emery or coal coke, is a substance inorganic with a formula SiC. It is produced by a high-temperature resistive furnace using raw materials, such as wood chips, quartz sand or coal coke. (Salt is required to make green silicon carbide). 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 between 3.20 and 3.25% and a microhardness range of 2840-3320kg/mm2.

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 to process materials that have low tensile resistance, 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 for honing and fine grinding tools made from high-speed steel and for cylinder liners. There is also a cubic silicon-carbide, which is yellow-green crystals 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 (which contains about 85% SiC), which is a deoxidizer of excellent quality, can improve the steelmaking process and speed. It also allows for better control over chemical composition. Silicon carbide can also be used to produce silicon carbide for electric heater elements.
It is the second hardest substance in the world, after diamonds (10). It has excellent heat conductivity and is a semi-conductor.

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. Below 2000 degC b Silicon Carbide with cubic crystals, similar to a diamond, is produced. The network can be seen on the page. It is not only eye-catching, but also more stable than the a type. A type of silicon carbide called m-silicon carbide 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 high temperature furnaces or bearings. 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 and use it in place of silicon for 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 carburide. The different stacking of silicon and carbon atoms creates a variety of a SiC variants. Over 70 types have been identified. Above 2100degC bSiC turns into aSiC. 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 crushed and then subjected to acid-base washing, magnetic separation, sieving, or water selection.
It is artificial because silicon carbide has a low natural content. The standard method is a mixture of quartz sand, coke, silica and oil 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 is made by melting SiC blocks, or pellets. Because they are hard and contain C, SiC pellets used to be called emery. It is not natural emery, also known as garnet. Quartz, petroleum coal, etc. are usually used to produce SiC smelting slabs in industrial production. 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 temperature. Its main components are the furnace bottom with electrodes in the interior, the sidewall that can be removed, and the furnace core. Both ends are electrode-connected. Known as buried-powder firing, this method of firing is used in an electric furnace. As soon as you turn it on, the heating begins. The furnace core is at 2500degC (or even higher, between 2660-2700degC). SiC synthesizes at 1450degC (although SiC primarily 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 maintain a constant voltage by adjusting the voltage based on the electrical load characteristics. It takes about 24 hours to heat up the high-power furnace. 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 further 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 static ring (used on mechanical seals), moving ring (used on mechanical seals), flat ring (used on flat surfaces) and more. Our silicon carbide products can 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 lower when combined with graphite than cemented carbide and alumina. Therefore, it is suitable for PV values that are high, particularly in conditions where strong acids or alkalis will be transported. Our SIC-1 silicon carbid atmospheric sintered product range has high density and high hardness. It also comes in large batches with the capability to produce products of complex shapes. They are resistant to strong acids and Alkalis and have exceptionally 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 sealing. 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, main components C and SiO), amorphous material layer (the main component is 70% to 90% SiC; it’s Cubic SiC that is b-sic. C, C-SiO2, 40% to 60% of the material is made up of carbonates Fe Al Ca Mg), second grade material layer ( 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 fraction of the oxycarbide layers are typically collected as spent materials. A portion of this oxycarbide is also collected along with the amorphous and second-grade products, as well as a portion from the bonded layer, as recycled material. Large lumps and impurities, as well as some charges and tight bonds are discarded. The first-grade material is classified, then coarsely or finely crushed. It’s treated chemically, dried, sieved, then magnetically separated. 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 an inquiry if you are interested in high-quality Titanium oxide.