Silicon Carbide Ceramic Balls

Silicon carbide (SiC) ceramic balls are widely used in applications requiring high wear resistance, corrosion resistance, and excellent mechanical properties. Here are some key parameters for silicon carbide ceramic balls:

  1. Chemical Formula: SiC
  2. Density: Silicon carbide ceramic balls typically have a density ranging from 3.18 to 3.21 g/cm³, which is higher than that of steel (around 7.85 g/cm³) but lower than tungsten carbide.
  3. Hardness: With a Mohs hardness rating of 9.5, just below diamond at 10, SiC ceramic balls exhibit exceptional hardness and wear resistance.
  4. Compressive Strength: They can withstand high compressive strengths, typically above 3000 MPa.
  5. Thermal Conductivity: Silicon carbide has high thermal conductivity, which ranges from about 100 to 300 W/(m·K), making it suitable for high-temperature applications.
  6. Fracture Toughness: While SiC is known for its hardness, its fracture toughness is relatively low compared to metals, which can limit its use in situations prone to impact.
  7. Thermal Expansion Coefficient: Silicon carbide has a low coefficient of thermal expansion, typically around 4.5 × 10^-6 /°C, contributing to its dimensional stability across a wide temperature range.
  8. Chemical Resistance: SiC is highly resistant to corrosion from most acids, alkalis, and salt solutions, making it ideal for chemical processing equipment.
  9. Electrical Properties: It is an electrical semiconductor and can be doped to enhance its electrical conductivity for specialized electronic applications.
  10. Grain Size: The grain size of the silicon carbide used in the balls can significantly affect properties like strength and surface finish. Finer grain sizes generally result in improved mechanical properties.
  11. Sphericity and Surface Finish: High-quality SiC ceramic balls are manufactured to tight tolerances for sphericity and surface roughness to ensure consistent performance in precision applications such as bearings.

  12. Applications: Silicon carbide ceramic balls find use in bearing applications where high-speed operation, extreme temperatures, or corrosive environments are present. They are also used in grinding media, valve components, and pump seals, among others.

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