Silicon Carbide

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Description of Silicon Carbide

Silicon carbide (SiC), also known as corundum, is a hard compound containing silicon and carbon. It is a new type of strong composite deoxidizer, which replaces the traditional silicon carbon powder for deoxidation. Compared with the original process, its physical and chemical properties are more stable. , good deoxidation effect. Silicon carbide is usually produced in resistance furnaces at high temperatures of 1700 – 2500 °C. Silicon carbide has been an important material in sandpaper, grinding wheels and cutting tools since the late 19th century. In recent years, it has found applications in refractory linings and heating elements for industrial furnaces, wear-resistant parts for pumps and rocket engines, and semiconductor substrates for light-emitting diodes.

Classification of Silicon Carbide

Silicon carbide is a product formed by a chemical reaction of carbon materials mixed with silicon dioxide or quartz sand, which develops into a solid cylindrical ingot around the core, with radial layers ranging from graphite inside to α-SiC (a material with a coarse-grained structure), β-SiC, metallurgical grade and post unreacted material on the outside, remelted. SiC can be produced black or green, depending on the raw material used.

The content of black silicon carbide is more than 95%, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron, non-ferrous metals, etc.

Green silicon carbide contains more than 97% SiC, is green in color, has higher hardness and brittleness than TH, and has good thermal and electrical conductivity. steel knife.

In addition, there is cubic silicon carbide, which is a yellow-green crystal produced by a special process. The abrasive tools used to make it are suitable for superfinishing of bearings. The surface roughness can be processed from Ra32-0.16 micron to Ra0.04-0.02 micron.

After cooling, the silicon carbide ingots are accurately sorted, mostly manually by skilled workers, and further processed for different applications. The solid silicon carbide material is then carefully crushed, sorted and, if necessary, ground again. Another option is to further chemically treat silicon carbide to obtain specific properties for its application.

Application of Silicon Carbide(SiC)

1. Non-ferrous metal smelting

Utilizing the high humidity resistance, good thermal conductivity, impact resistance, and high strength of silicon carbide, it can obtain better results by indirect heating of materials at high temperatures. Such as the lining of the copper melting furnace, a distillation furnace tray, a zinc powder furnace arc plate, an aluminum electrolytic cell, etc.

2. Metallurgical mineral processing industry

The hardness of moissanite is actually second only to diamond, and it has strong wear resistance, which is more than 5 times the service life of cast iron and rubber. It is also an ideal material for aviation runways.

3. Building materials ceramics and grinding wheel industry

Utilizing the characteristics of high-temperature resistance and high heat conduction system of moissanite, thin-plate kiln furniture can be manufactured, which can not only increase the capacity of kiln furniture, but also greatly improve the product quality of the kiln, and help shorten the production cycle. Silicon carbide can be said to be a ceramic glaze. Ideal indirect material for baking and sintering.

4. Energy saving

With good stability and thermal conductivity, it can be used as a heat exchanger, reducing fuel consumption by more than 20% for enterprises, and can also greatly increase productivity. It is also very suitable to be placed inside the discharge pipeline used in the mine dressing plant.

5. Applications in new fields

In recent years, the technology research and development of silicon carbide has shown an accelerated trend. For example, the solar photovoltaic industry is in a period of rapid growth, and crystalline silicon batteries also occupy a certain position in the market share. It is used for the development of power generation efficiency in battery technology. At present, It is also a market trend.

In the future, the main application of silicon carbide may also be concentrated in the fields of circuit components, semiconductors, structural materials, clutches, nuclear fuels, and cutting tools. And with the improvement of recycling technology, it is also possible to realize the recycling of some finished products.