High Speed Si3N4 Ceramic Bearing

Si3N4 Ceramic Bearing

Low density:
Due to low density, ceramic bearings have low centrifugal load and create little heat, so they can work in the conditions of higher speed
Rational elastic ratio:
The elastic ratio of ceramics is higher than that of steel, thus increasing bearing's dynamic stiffness, however, the elastic ratio should not be too high, otherwise, excessive elastic ratio will create stress concentration to decrease the bearing capacity

Low thermal expansion:
Low thermal expansion can make bearing insensitive to the changes of temperature, and is helpful to prevent the bearing from being jammed
According to hybrid bearings, the applicable rotation speed interval can be wider

High strength:    
High compressing strength is the requirement of bearing high contact stress (for ceramics, the compression strength are usually determined by the rupture modulus measured by three-point or four-point bending strength)      
High hardness and toughness:      
Ceramics feature high hardness and toughness, thus ensuring good surface smoothness, and preventing the damage of impact and other outer particles      
Good rolling fatigue performances      
Flaking failure pattern:      
If the rolling element fails in the working, it should be fatigue flaking, this pattern has sign before bearings is jammed, and is the least harmful failure pattern      
Resistance to elevated temperatures and stability:    
Carbide and alumina.