What is black silicon carbide? What are its applications?

Black silicon carbide is made from quartz sand, petroleum coke, and high-quality silica as main raw materials, smelted at high temperatures in an electric resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum, but it is brittle and sharp.

 

Green silicon carbide is made from petroleum coke and high-quality silica as main raw materials, with salt added as an additive, smelted at high temperatures in an electric resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum. There are two different types of silicon carbide abrasives commonly used. One is green silicon carbide, with a silicon carbide content exceeding 97%, mainly used for grinding hard tools containing gold.

 

 

The other is black silicon carbide, which has a metallic luster and a silicon carbide content exceeding 95%. Its strength is higher than green silicon carbide, but its hardness is lower. It is mainly used for grinding cast iron and non-metallic materials.

 

Applications of Black Silicon Carbide:

 

1. Abrasives: Black silicon carbide is mainly used for grinding and polishing optical glass, cemented carbide, titanium alloys, bearing steel, and high-speed steel cutting tools; it is also used for cutting and grinding materials with low tensile strength.

 

2. Refractory Materials: Black silicon carbide has excellent thermal shock resistance and is a high-quality refractory material. Depending on the production process, it can be divided into recrystallized silicon carbide products, high-temperature hot-pressed products, and products using silicon nitride or clay as binders. Main products and applications include: high-temperature furnace components and supports.

 

3. Metallurgical and Electrical Industries: In addition to its use in various smelting furnace linings, it can also be used as a deoxidizer in steelmaking and a modifier for cast iron structure. The chemical element requirements for black silicon carbide release agents are as follows: Compared with traditional steelmaking processes using coke and silicon powder for venting and deoxidation, using silicon carbide release agents has the advantages of better steel quality and a better working environment.

 

4. Other fields: In the electrical industry, black silicon carbide materials are also widely used as electric heating elements, high-temperature semi-superconducting materials, far-infrared panels, and surge arrester materials.