Silicon Carbide Ceramic Disc Roll for High-Temperature Furnaces

Silica ceramics (SiO₂ ceramics) are high-performance ceramic materials primarily composed of silicon dioxide. They exhibit excellent high-temperature resistance, low thermal expansion, superior dielectric properties, and chemical stability, making them widely used in electronics, aerospace, chemical engineering, and other advanced industries.

• High-Temperature Resistance: Silica ceramics have a melting point of up to 1713°C (crystalline form) and can operate stably below 1600°C, making them ideal for high-temperature applications.
• Low Thermal Expansion (~0.5×10⁻⁶/°C), ensuring outstanding thermal shock resistance for environments with rapid temperature fluctuations.
• Excellent Dielectric Performance, with low dielectric loss at high frequencies, making them suitable for microwave windows and electronic substrates.
• Chemical Inertness, resistant to acids (except hydrofluoric acid) and alkalis, ideal for chemical reactor linings.
• High Hardness (Mohs hardness 7), though inherently brittle, often requiring reinforcement or toughening modifications for improved mechanical strength.

The production of silica ceramics mainly involves powder processing and high-temperature sintering:

• Raw Materials: High-purity quartz powder (fused silica) or chemically synthesized nano-SiO₂ powder.
• Forming Techniques: Dry pressing, slip casting, gel casting, or 3D printing can be used for shaping.
• Sintering Methods:
  • Pressureless Sintering: Cost-effective but typically requires sintering aids (e.g., Al₂O₃, MgO) to enhance densification.
  • Hot Pressing: Combines high temperature and pressure to achieve highly dense ceramics with superior mechanical properties.
  • Reaction Sintering: Silicon powder is shaped and then oxidized, suitable for complex-shaped components.

• Electronics: High-frequency circuit substrates, insulating components.
• Aerospace: Radome materials, high-temperature wave-transparent structures.
• Chemical Equipment: Corrosion-resistant reactor linings, piping components.
• Optical Devices: UV-transparent windows, laser components.

Thanks to their unique combination of properties, silica ceramics play a crucial role in advanced industrial applications. Future advancements in manufacturing techniques (e.g., nanocomposite reinforcement, toughening modifications) are expected to further expand their potential uses.