Silicon carbide: It is an inorganic substance with the chemical formula SiC. It is smelted at high temperature in a resistance furnace from raw materials such as quartz sand, petroleum coke (or coal coke), and sawdust (salt is required for the production of green silicon carbide).Silicon carbide also has a rare mineral in nature, moissanite.Among the non-oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is a widely used and economical type, which can be called gold steel sand or refractory sand.

Silicon carbide has stable chemical properties, high thermal conductivity, small coefficient of thermal expansion, and good wear resistance. In addition to being used as an abrasive, it has many other uses. For example, silicon carbide powder is coated on the inner wall of the impeller or cylinder block of a turbine by a special process, which can improve its wear resistance and extend its service life by 1 to 2 times; it is used to make high-grade refractory materials, which are shock-resistant, small in size, light in weight and high in strength, and have good energy-saving effects.Low-grade silicon carbide (containing about 85% SiC) is a very good deoxidizer. It can be used to speed up steelmaking, and it is easy to control the chemical composition and improve the quality of steel.In addition, silicon carbide is also widely used in the production of silicon carbon rods for electric heating elements.Silicon carbide has a high hardness, with a Mohs hardness of 9.5, which is second only to the world's {1} hard diamond (grade 10). It has excellent thermal conductivity and is a semiconductor that can resist oxidation at high temperatures.

Black silicon carbide: It is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, smelted at high temperature in a resistance furnace.Its hardness is between corundum and diamond, its mechanical strength is higher than that of corundum, and it is brittle and sharp.

1.Power electronics：

Black silicon carbide is an important material for power electronic devices. Its high electron mobility and low resistivity can effectively improve the efficiency and power density of the device.Black silicon carbide power devices can be used in electric vehicles, solar panels, high-power LED light sources and other fields.

2.Module electronic components：

The high thermal conductivity and high thermal stability of black silicon carbide make it an ideal modular electronic component, such as IGBT, MOSFET, SiC-SBD, etc.These components can be widely used in power electronics, communications, electronic equipment and other fields, and have the characteristics of high efficiency, high stability and long life.

3.Photoelectric device：

Using the photoelectric characteristics of black silicon carbide, such as its high heat resistance, high energy loss threshold and high radiation resistance, devices with special photoelectric properties, such as LEDs, laser diodes, photodetectors, etc., can be manufactured.These photoelectric devices are widely used in military, aerospace, communications, medical and other fields.

4.Protective material：

Black silicon carbide has the characteristics of high hardness, high temperature stability, high corrosion resistance and high wear resistance, making it an important protective material, such as aerospace, shipbuilding, automobiles, chemical industry and other fields.Using these characteristics of black silicon carbide, high-strength composite materials, high-temperature wear-resistant coatings, high-pressure tempered glass, etc. can be manufactured.

In short, black silicon carbide has a wide range of application prospects and has become one of the representatives of today's new generation of semiconductor materials.With the continuous progress of technology and the continuous expansion of applications, black silicon carbide will give full play to its unique advantages and application value in more fields.

Green silicon carbide: The manufacturing method is the same as black silicon carbide, but the purity of the raw materials used is higher. Salt is added as an additive. It is also formed at a high temperature of about 2200°C in a resistance furnace. It is green, translucent, and hexagonal. Crystal shape.Its Sic content is higher than that of black, and its physical properties are similar to that of black silicon carbide, but its properties are slightly more brittle than that of black, and it also has good thermal conductivity and semiconductor properties.

Green silicon carbide, suitable for processing cemented carbide, glass, ceramics and non-metallic materials, is also used in semiconductor materials, high-temperature silicon-carbon rod heating elements, far-infrared source substrates, etc.

Comparison of black silicon carbide and green silicon carbide：
1.Black silicon carbide contains about 98.5% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used in the production of products with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
2.Green silicon carbide contains more than 99% SIC and has good self-sharpening properties. It is mostly used in the production of cemented carbide, titanium alloy and optical glass products.

Green silicon carbide has stable chemical properties, high thermal conductivity, low coefficient of thermal expansion, and good wear resistance.