Silicon Nitride Bearing Balls

Silicon Nitride is an ideal material for bearings. Ceramic bearings have good wear and corrosion resistance, and great mechanical strength under high temperature.


Silicon Nitride Bearing Balls, Si3N4 bearing balls


Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world. Si3N4 bearing is a covalent bond compound with high strength, low density, and high temperature resistance. Silicon Nitride ceramic is ideal for bearing parts.


Silicon Nitride Bearing Balls Description


Size1-30mm diameter
Density3.22 g/cm3
Flexural strength800 MPa
Fracture toughness6.5 MPa m^1/2
Thermal stress parameters569 K


Data Sheet & Typical properties of silicon nitride material:


 TypeGas pressure sintered
 Colordark grey
 Water Absorption%0
 Young ModulusGpa290
 Vickers HardnessGpa18 – 20
 Compressive StrengthMpa2200
 Flexural StrengthMpa650
 Thermal ConductivityW/m.K25
 Thermal Shock ResistanceΔ(°C)450 – 650
 Max. Working Temp.°C1200
 Volume ResistivityΩ ·cm> 10^14
 Dielectric Constant8.20
 Dielectric StrengthkV/mm16
* Tests under room temperature environment;

* The above information is offered for comparison only. Exact properties will vary depending on the manufacturing method.


Comparison of Si3N4 Ceramic and Steel for Bearing Balls


Working temperature800 ℃180 ℃
Density3.21g/cm37.8 g/cm3
Thermal expansion coeff.3.4×10-612.5×10-6
Hardness, HV1500About 750
Young’s Module320GPa208GPa
Corrosion resistanceGoodPoor
Thermal conductivityPoorGood
Wear resistanceExcellentGood


Compared with steel, high-performance silicon nitride bearings balls have better mechanical properties under high temperature and could survive from most of the corrosive chemicals. Si3N4 bearing balls have already been applied in automobiles, rockets high speed engines, equipment working in corrosive environment and some performance model cars.


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