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Black Silicon Carbide: Versatile High-Hardness Material for Abrasive & Refractory Industries
Introduction
Black silicon carbide, also called black carborundum, is synthesized by smelting quartz sand and petroleum coke inside electric resistance furnaces under ultra-high temperature. Its black crystal appearance comes from trace free carbon and mineral impurities inside the structure. With Mohs hardness reaching 9.2, only diamond and cubic boron nitride are harder than it in common industrial materials. Combined with high temperature resistance, anti-corrosion performance and excellent thermal conductivity, black silicon carbide has become an indispensable raw material for abrasives, refractory manufacturing, metallurgy and advanced ceramic industries worldwide.
Core Physical & Chemical Advantages
- Super high hardness and sharp crystal edgesIts crystalline structure breaks naturally during grinding to form new sharp cutting edges, achieving efficient cutting and grinding without rapid passivation. It works perfectly for processing cast iron, stone, glass and ordinary ceramics.
- Excellent high-temperature stabilityMelting point reaches 2250°C, long-term service temperature can reach 1900°C. It maintains stable mechanical strength inside high-temperature kilns without softening, deformation or collapse.
- Outstanding thermal shock resistance and thermal conductivityLow thermal expansion coefficient enables it to endure frequent rapid heating and cooling without cracking. Fast heat conduction makes it ideal for kiln furniture and thermal conduction components inside roller kilns and shuttle kilns.
- Strong chemical inertnessIt resists erosion from acid, alkali, molten slag and glass liquid, and will not react with most molten metals under high-temperature environments, greatly extending the service cycle of refractory linings.
- Wear-resistant and durableDense grain structure brings great wear resistance, lowering replacement frequency of abrasive tools and refractory parts to save production costs for factories.
Main Industrial Application Fields
1. Abrasive & Surface Treatment Industry (Largest Application)
Black silicon carbide grit and powder are made into grinding wheels, cutting discs, abrasive belts and sandpaper for grinding cast iron, non-ferrous metals, stone materials and glass products. It is also widely used for sand blasting, rust removal and surface polishing of metal workpieces, aerospace parts and construction components to obtain clean and smooth surfaces.
2. Refractory & Ceramic Kiln Industry
As core raw material for refractory bricks, SiC setter plates and kiln shelves, it forms high-temperature kiln linings for glass melting furnaces, ceramic roller kilns and ceramic firing kilns. SiC kiln furniture made of black silicon carbide bears ceramic blanks during firing; uniform heat conduction avoids color difference and deformation of finished ceramic products, widely adopted by tile factories and sanitary ceramic manufacturers.
3. Metallurgical Industry
Used as metallurgical deoxidizer and alloy additive in steel smelting to purify molten steel and improve steel performance. It can also be processed into crucibles, nozzles and wear-resistant structural parts for metal smelting furnaces due to its anti-slag property.
4. Advanced Ceramics & New Materials
Added into ceramic formulas to enhance ceramic wear resistance and thermal shock resistance, applied in wear-resistant ceramic parts, automotive ceramic brake components and mechanical sealing pieces. High-purity black silicon carbide can also be made into semiconductor substrates for new energy electronic equipment.
5. Other Scenarios
It can be mixed into wear-resistant floor coatings and anti-slip materials for industrial workshops. Fine silicon carbide powder is used for precision polishing of optical glass, gems and precision hardware parts.
Our Supply Service
We supply black silicon carbide with SiC content ranging from 75% to 99%, covering coarse grit, fine powder and micro-powder grades to match abrasive production, refractory batching and ceramic formulation demands.
- Multiple particle sizes customizable according to customer technical requirements
- Strict chemical composition inspection before delivery to guarantee stable purity
- Support bulk sea shipment to Mundra Port (India), Middle East ports and global destinations
- Long-term bulk clients enjoy factory direct preferential prices
Conclusion
Black silicon carbide balances premium performance and cost advantages compared with white silicon carbide. It is not only a mainstream abrasive material for metal processing, but also an economical refractory raw material for ceramic kilns and glass factories.
If you are sourcing black silicon carbide for abrasive manufacturing, refractory production or ceramic formulation, please send us your required purity, particle size and monthly consumption. We will provide complete technical datasheets and competitive quotations to support your production.
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