Brief introduction of silicon carbide products


Sep 1, 2023

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Introduction to silicon carbide products
Silicon carburide also known by the names moissanite, emery or coal coke, is an organic substance with the chemical formula 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 between 3.20 and 325. Their microhardness ranges from 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 optical glasses, as also for honing and fine grinding tools made from high-speed steel. There is also a cubic silicon-carbide, which is yellow-green crystals prepared through a special method. The tool can be used to superfinish 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 about 85% SiC), which is an excellent Deoxidizer and can improve steel quality, speed up the steelmaking process and ease chemical composition control. 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 good thermal 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. The cubic structure of b Silicon Carbide (similar to diamond) is formed below 2000 degrees Celsius. The network can be seen on the page. It is attractive because the unit surface is higher than that of 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 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 color of pure silicon carbide, however, is black or brown when produced industrially. This is due to 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 mixing 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 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. 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 bottom of furnace, end wall with electrodes inside, removable sidewalls and furnace core body. Both ends are electrode-connected. The method of firing this electric oven is known as buried-powder firing. As soon as you turn it on, the heating begins. The furnace core is at 2500degC (or even higher, between 2660-2700degC). SiC is produced when the charge reaches a temperature of 1450degC (but SiC forms mainly at temperatures >=1800degC). It also releases co. 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 based on the electrical load characteristics in order to maintain constant energy. The high-power furnace must be heated for around 24 hours. After an interruption of power, the reaction that generates SiC is complete. After cooling the sidewall, the charge can be slowly removed. The products of silicon carbide can be classified according to their use environment and in general, they are used more on machinery. Silicon carbide seal rings can, for example, be used to seal mechanical seals. These seal rings can be classified 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 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, are strong, hard, wear resistant, low in friction coefficient, and can withstand high temperatures. The friction coefficient of silicon carbide ceramic is smaller when combined with graphite than that of cemented carbide and alumina. Therefore, it can be used to produce PV values of high value, particularly in conditions where strong acids or alkalis are 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 ideal for sealing applications requiring high performance, with high PV values. Our company’s SIC-3 silicon-carbide ceramic works are made from graphite-containing materials. When combined with other materials, the friction coefficient of silicon carbide is low because it contains fine dispersed graphite particles. It has excellent self-lubricating qualities, making it ideal for airtight 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), and carbonates of Fe, Al Ca Mg. Binder layer (for bonding Very Tight Material Layer, main elements are C, SiO2, 40-60% SiC and Fe Al Ca Mg Carbonate), amorphous layer (the major component is 70-90 % SiC; it is Cubic SiC b-sic), amorphous layer (the primary component is 90-95% SiC. The coating has formed hexagonal SiC (mouth One SiC), second-grade SiC (the main components is 90-95% 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 fraction of the bonding material. Large lumps, tight bonds and impurities such as charges are discarded. The first-grade material is classified, then coarsely crushed or finely ground, treated chemically, dried and sieved before being magnetically separated 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 an inquiry if you are interested in high-quality Titanium oxide.