Product name: Si3N4 bearings & parts
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CERAMIC VS. STEEL |
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Item |
Bearing Steel |
Ceramics (SI3N4) |
Characteristics of Ceramic Bearings |
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Density (g/m?) |
7.8 |
3.2 |
Higher Speed Decreased centrifugal force Reduced Ball Skidding Lower Operating Temperature Less wear Less Friction |
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Heat Resistance (oC) |
180 |
800 |
Maintains stability at high temperatures |
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Coefficient of linear thermal expansion (1/oC) |
12.5 X 10-6 |
3.2 X 10-6 |
Minimal Ball Deformation Lower operating Temperature Stable Running Preload Reduced Contact Angle Change |
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Vicker’s Hardness (HV) |
750 |
1,500 |
Reduced Ball/Race Contact Area Minimum Ball Deformation Less Friction More Rigid Less Wear Lower Operating Temperature |
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Young’s Modulus (Gpa) |
206 |
314 |
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Poisson’s Ratio |
.30 |
.29 |
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Magnetism |
Ferromagnetic |
Non-Magnetic |
Reduced Torque in Strong Magnetic Field |
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Conductivity |
Conductive |
Non-Conductive |
No Electrical Arcing Through Balls Less Wear Reduced Race Way Pitting and Fluting |
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Corrosion Resistance |
Not Good |
Excellent |
Less Wear Harsh Environment Durability Longer Life |
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7th year