Black Silicon Carbide: Overview | Best Price & Wide Uses
Black silicon carbide is a type of silicon carbide that possesses a hexagonal crystal structure. True to its name, it appears black, and thus is referred to as “black silicon carbide.” It is primarily made from raw materials such as quartz sand, petroleum coke, and silicon, processed in an electric resistance furnace at temperatures exceeding 1800°C. Black silicon carbide is a non-metallic mineral product known for its high hardness, low thermal expansion coefficient, and excellent thermal conductivity, making it widely used in the manufacturing of abrasives, ceramics, and refractory materials.
Why is black silicon carbide black?
Silicon carbide is classified into two main types based on its color: black silicon carbide and green silicon carbide. Black silicon carbide becomes black due to the formation of an oxide layer during the manufacturing process, which tends to easily attract dust, grease, and other impurities from the air, resulting in a black appearance. Additionally, the carbon content within the black silicon carbide also contributes to its color. A higher carbon content in the crystal leads to a darker hue. The presence of aluminum can also affect the color, sometimes resulting in black or brown shades. Chemical analysis shows that black silicon carbide is primarily composed of SiC, Fe2O3. MgO, and Al2O3. Compared to green silicon carbide, black silicon carbide contains relatively high levels of SiC.
Selection of Raw Materials for Black Silicon Carbide
To enhance the purity and absorption rate of black silicon carbide, XLS Metals meticulously selects raw materials. The materials used in production are chosen to be high-purity quartz or carbide powders. Since the purity of the raw materials directly affects quality, advanced testing equipment is employed to select materials that are high in purity and low in ash content. The selected raw materials are mixed with soluble metal salts to precipitate or crystallize metal ions, which are then processed into high-purity nano powders through heating or dehydration.
Production Process of Black Silicon Carbide
The production process mainly involves selecting raw materials, high-temperature smelting, crushing, precision grinding, and screening. First, raw materials are chosen, and impurities are removed as much as possible. Then, they are placed in an electric furnace and heated above 1800°C for smelting. The resulting black silicon carbide blocks are initially crushed using a jaw crusher, then further processed into various specifications with a cone crusher. Finally, they are screened to produce black silicon carbide sand of different grain sizes and finely powdered using a precision grinding machine.
Specifications of Black Silicon Carbide
| Grade | Chemical Composition % | |||
| SiC | F.C | Fe2O3 | ||
| SiC 60# | 60 | 15-20 | 8-12 | 3.5 max |
| SiC 65# | 65 | 15-20 | 8-12 | 3.5 max |
| SiC 70# | 70 | 15-20 | 8-12 | 3.5 max |
| SiC 75# | 75 | 15-20 | 8-12 | 3.5 max |
| SiC 80# | 80 | 3-6 | 3.5 max | |
| SiC 85# | 85 | 2.5 max | 3.5 max | |
| SiC 90# | 90 | 1.0 max | 1.2 max | |
| SiC 95# | 95 | 0.6 max | 1.2 max | |
| SiC 97# | 97 | 0.3 max | 1.2 max | |
| SiC 98# | 98 | 0.3 max | 0.8 max | |
| Size: 325 mesh, 200 mesh, 0-1mm, 1-3mm, 1-10mm, 10-50mm, | ||||
Properties of Black Silicon Carbide
Hardness: The hardness of black silicon carbide ranks next to diamond and cubic boron nitride, and it is extensively used in manufacturing high-hardness, wear-resistant tools and components.
Corrosion Resistance: Black silicon carbide has high strength and corrosion resistance, making it suitable for manufacturing mechanical parts and refractory materials that require corrosion resistance.
Thermal Conductivity: Black silicon carbide possesses high thermal conductivity, utilized in the production of heat dissipation plates and thermal conductive materials.
High Temperature Resistance: Compared to other refractory materials, black silicon carbide exhibits superior high-temperature performance, remaining stable in high-temperature environments and widely applied in high-temperature materials and electronics.
Radiation Resistance: Black silicon carbide has excellent radiation resistance and is widely used in the nuclear industry and space science fields.
XLS Metals’ Black Silicon Carbide
XLS Metals is an experienced silicon carbide supplier. Its products are utilized globally, primarily in steelmaking, casting, abrasive tools, and aerospace sectors. Through years of research and innovation, XLS Metals holds numerous patented technologies related to silicon carbide products, earning a high reputation within the industry through the efforts of its team and craftsmanship.
