Ceramic Bearing Material Properties

Cage Material Considerations

PEEK cages are commonly used in high-performance ceramic bearings and are generally suitable for operating temperatures up to approximately 250°C.

For higher temperature applications, full complement ceramic bearing designs without polymer cages may be considered. However, these configurations should be carefully evaluated for rotational speed, lubrication conditions, friction and thermal expansion behavior.

Silicon Nitride (Si₃N₄)

Key Characteristics

• Extremely low density

• Excellent rolling fatigue resistance

• Very low thermal expansion coefficient

• Outstanding thermal shock resistance

• Superior high-speed capability

Typical Applications

• High-speed spindle bearings

• EV traction motors

• Aerospace systems

• Precision machine tools

Zirconia (ZrO₂)

Key Characteristics

• Exceptional fracture toughness

• Excellent impact resistance

• Superior corrosion resistance

• High dimensional stability

Engineering Notes

Transformation toughening mechanisms make zirconia one of the toughest oxide ceramics used in advanced engineering applications.

At elevated temperatures, zirconia-based ceramics may exhibit ionic conductivity, widely utilized in solid oxide fuel cells (SOFC).

Typical Applications

• Pump bearings

• Valve systems

• Heavy-load ceramic bearings

• Chemical processing systems

Silicon Carbide (SiC)

Key Characteristics

• Extremely high hardness

• Outstanding wear resistance

• Excellent thermal conductivity

• Superior corrosion resistance

Engineering Notes

Among high-hardness structural ceramics, silicon carbide offers one of the highest thermal conductivity performances.

Typical Applications

• Semiconductor equipment

• Mechanical seals

• High-temperature systems

• Extreme wear environments