Silicon nitride ceramic offers low density,high hardness,high strength,excellent wear resistance,corrosion resistance and electrical insulation.Compared with conventional bearing steel,silicon nitride ceramic rolling elements are lighter,helping reduce centrifugal loads during high speed rotation,lower friction and heat generation,and improve operating stability in high speed equipment.Silicon nitride ceramic bearings are particularly suitable for high speed spindles,precision machine tools,high speed motors,vacuum equipment and other high-speed rotating systems.
Main Features of Si₃N₄ Ceramic Bearings:
Suitable for High-Speed Rotation
High Hardness and Wear Resistance
Low Friction and Reduced Heat Generation
Good Mechanical Strength
Electrical Insulation
Corrosion Resistance
Good Precision Retention
Applications
CNC Machine Tools
High-Speed Machining Centers
High-Speed Motorized Spindles
Precision Machine Tool Spindles
High-Speed Motors
Vacuum Equipment
Precision Instruments
High-Speed Dental Equipment
Semiconductor Manufacturing Equipment
High-Speed Rotating Machinery
Special-Environment Mechanical Systems
Silicon Nitride Ceramic Material Properties:
| Properties | Unit | Value |
|---|---|---|
| Content | wt% | 88 |
| Density | g/cm³ | 3.23 |
| Water Absorption | % | 0 |
| Coefficient of Linear Thermal Expansion | ×10⁻⁶/K | 3.2 |
| Modulus of Elasticity (Young's Mod.) | GPa | 300 |
| Poisson's Ratio | / | 0.26 |
| Vickers Hardness | Hv | 1500 |
| Flexural Strength (@ R.T.) | MPa | 720 |
| Flexural Strength (700°C) | MPa | 450 |
| Compressive Strength (@ R.T.) | MPa | 2300 |
| Fracture Toughness, Kic | MPa·m¹/² | 6.2 |
| Thermal Conductivity (@ R.T.) | W/m·K | 25 |
| Electrical Resistivity (@ R.T.) | Ω·mm²/m | >10¹³ |
| Max. Use Temperature (no loading) | °C | 1050 |
| Corrosion Resistance | / | Excellent |
Looking for the Right Si₃N₄ Ceramic Bearings?
Please provide your bearing dimensions, operating speed, load, temperature, and application requirements. INNOVACERA can provide suitable silicon nitride ceramic bearing solutions for high-speed, precision, and demanding operating conditions.
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Frequently Asked Questions
Why Choose Silicon Nitride Bearings for High-Speed Spindles? What Performance Benefits Do They Offer?
Silicon nitride (Si3N4) bearings feature a low density of 3.23 g/cm³ (roughly 40% lighter than bearing steel), which drastically minimizes centrifugal load, frictional heat, and vibration at extreme RPMs. With a high Vickers hardness of 1500 Hv, flexural strength of 720 MPa, and exceptional electrical resistivity (>10¹³ Ω·mm²/m), they eliminate electrical arcing pitting and resist abrasive wear, significantly extending spindle runtime in CNC machining centers and high-speed electric motors.
Need Bearings for Extreme Environments? How to Source Custom Si3N4 Ceramic Bearings from a Reliable Supplier?
When sourcing bearings for semiconductor chambers, vacuum equipment, or high-speed dental tools, load limits and operational tolerances are paramount. INNOVACERA is an experienced engineering ceramic supplier offering custom bearing solutions—including full-ceramic configurations and hybrid designs (Si3N4 ceramic rolling balls paired with alloy steel races). You can provide your boundary dimensions, operating speeds, and load ratings to receive engineered solutions tailored to your machinery.
