In the market, we can see silicon carbide in various colors. This is because different types of silicon carbide are available for applications in different fields. Especially when these silicon carbide crystals sparkle in the sunlight, they appear quite beautiful. In reality, pure silicon carbide is a colorless crystal. The color of industrial-grade silicon carbide depends on the types and quantities of impurities present in the crystal, ranging from light yellow to black. In the abrasives industry, shades from light blue to black are considered black silicon carbide, while colorless to green shades are referred to as green silicon carbide.
However, there is another viewpoint that explains the black color of silicon carbide. It suggests that fine carbon particles are trapped within the crystal structure. Without the addition of salt, some of the silicon dioxide vapor escapes due to its rapid evaporation, while the carbon material does not have enough time to react. As a result, a small amount of silicon dioxide vapor is lost, and the carbon material remains as fine particles within the formed silicon carbide crystal.
The appearance color of silicon carbide is not only related to the natural color of the crystal itself but also influenced by the interference phenomenon of the thin oxide film on the crystal surface under natural light. When the thickness of the silicon dioxide film on the silicon carbide crystal surface varies or the angle of light reflection changes, the color on the surface of the silicon carbide crystal also appears differently. Therefore, under natural light, silicon carbide often exhibits a dazzling and colorful appearance.
Silicon carbide, as an inorganic material, finds applications in four major fields, including functional ceramics, refractory materials, abrasives, and metallurgical raw materials. As an abrasive, it can be used to produce grinding tools such as grinding wheels, oilstones, and abrasive heads. As a metal deoxidizer, silicon carbide deoxidizer is a new type of powerful composite deoxidizer that replaces traditional silicon powder and carbon powder for deoxidation. It exhibits stable physical and chemical properties, excellent deoxidation performance, shorter processing time, improved steelmaking efficiency, enhanced steel quality, and reduced consumption of raw materials.
Furthermore, utilizing the corrosion resistance, high-temperature resistance, high strength, and good thermal conductivity of silicon carbide, it can be used in various smelting furnaces, high-temperature kiln components, silicon carbide plates, support structures, silicon carbide crucibles, and more.green silicon carbide
