Silicon Carbide Bricks

Description

1. Key Application Areas of Silicon Carbide Bricks

1. Iron & Steel Metallurgy

  • Blast furnace linings: Used in the belly, bosh, and lower stack regions to withstand extreme temperatures (>1500°C) and molten slag erosion.

  • Hot blast stoves: Serve as heat exchangers in high-temperature air ducts due to their high thermal conductivity and thermal shock resistance.

  • Molten iron handling equipment (e.g., torpedo ladles, mixers): Resistant to chemical corrosion from molten iron and slag.

2. Non-Ferrous Metal Smelting

  • Aluminum electrolysis cells: Lining material for resisting corrosion from molten aluminum and cryolite (Na₃AlF₆).

  • Copper & zinc smelting furnaces: Used in hearths and flues to withstand metal vapors and high-sulfur environments.

3. Ceramics & Glass Industry

  • Kiln furniture (shelves, setters): Supports ceramic green bodies during repeated firings (1300–1600°C) without deformation.

  • Glass melting furnaces: Utilized in regenerator checkerworks for waste heat recovery.

4. Chemical & Energy Sectors

  • Coal gasifiers: Lining material for Shell/Texaco gasifiers, resisting slag attack under high temperatures and pressures.

  • Petrochemical refining: Linings for fluid catalytic cracking (FCC) units, enduring catalyst abrasion and acidic gases.

5. Environmental & New Energy Applications

  • Waste incinerators: Withstands highly corrosive combustion environments (HCl, SO₂, etc.).

  • SiC ceramic filters: Used for high-temperature dust removal (e.g., coal-fired power plants).

6. Other Fields

  • Aerospace: High-temperature components (e.g., rocket nozzle linings).

  • Semiconductor industry: Support structures for heat treatment equipment (requires high-purity SiC).

2. Critical Production Factors of SiC Bricks

1. Raw Materials

  • Silicon carbide (SiC) grains:

    • Black SiC (industrial grade, ≥95% purity) for general applications.

    • Green SiC (high purity, ≥99%) for demanding environments.

  • Binders:

    • Oxide-bonded (SiO₂, Al₂O₃): Cost-effective but weaker at high temperatures.

    • Nitride-bonded (Si₃N₄, SiAlON): Superior high-temperature strength but complex processing.

    • Self-bonded SiC: Reaction-sintered (Si + C → SiC), high strength but expensive.

  • Additives: Antioxidants (e.g., metallic Si), sintering aids (e.g., B₄C).

2. Manufacturing Processes

  • Forming techniques:

    • Pressing (dry/isostatic): For high-density bricks.

    • Extrusion: For complex shapes (e.g., honeycomb structures).

  • Sintering methods:

    • Pressureless sintering: Standard process, economical but porous.

    • Hot pressing: High density, requires costly equipment.

    • Reaction sintering: Low-temperature forming + silicon infiltration, ideal for intricate parts.

 

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