News

black silicon carbide for refractory crubile

Black silicon carbide (SiC) is a synthetic abrasive material produced by reacting silica sand and petroleum coke in an electric resistance furnace at high temperatures (around 2200°C). It is one of the hardest synthetic abrasives, with a Mohs hardness of 9–9.5, second only to diamond and boron carbide.

Key Properties of Black Silicon Carbide:

  • Hardness: Extremely hard and sharp, making it ideal for abrasive applications.

  • Thermal Stability: Maintains strength at high temperatures (up to 1600°C).

  • Chemical Resistance: Resistant to acids and alkalis.

  • Brittleness: More brittle than green silicon carbide, making it better suited for certain grinding and blasting applications.

  • Conductivity: Semi-conductive properties, useful in some electronic applications.

Applications of Black Silicon Carbide:

  1. Abrasive Tools: Used in grinding wheels, sandpaper, and cutting discs for metals, ceramics, and stone.

  2. Lapping & Polishing: Effective for finishing hard materials like tungsten carbide and glass.

  3. Refractory Materials: Added to high-temperature ceramics and furnace linings for improved durability.

  4. Wire Sawing: Used in cutting hard stones like granite and marble.

  5. Surface Blasting: Employed in sandblasting for cleaning and etching metal surfaces.

  6. Anti-Slip Coatings: Mixed into paints or coatings for slip-resistant surfaces.

  7. Electronics: Used in some semiconductor and LED applications due to its thermal conductivity.

Black silicon carbide (SiC) is a highly durable and refractory material often used in high-temperature applications, including crucibles. Here’s why it’s a good choice and some considerations:

Advantages of Black Silicon Carbide for Crucibles:

  1. High Thermal Conductivity – Efficient heat transfer ensures uniform heating.

  2. Excellent Thermal Shock Resistance – Resists cracking under rapid temperature changes.

  3. High Melting Point (~2,700°C) – Suitable for extreme heat applications.

  4. Chemical Inertness – Resists corrosion from molten metals, acids, and slags.

  5. Mechanical Strength – Hard and abrasion-resistant, maintaining structural integrity.

Common Uses:

  • Melting non-ferrous metals (aluminum, copper, zinc).

  • High-temperature furnace components.

  • Foundry applications where durability is critical.

Black SiC crucibles are ideal for high-performance applications where extreme temperatures, thermal cycling, and chemical resistance are critical.

Scroll to Top