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silicon nitride ceramic roller
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Comparing to metal materials, silicon Nitride is a ideal material for structural applications for its excellent performance, such as high strength, hardness, wear-resistant, high rigidity, corrosion resistance, high temperature, electrical insulator, nonmagnetic, and low density etc. They are suitable for structural materials at elevated temperature, which have been the primarily choice material for ceramic bearings. Their characteristics are shown as follows:
1. High corrosion resistance, which means they can be also used in strong acid,strong alkali and seawater.
2. High temperature resistance. Si3N4 ceramic balls remain the same strength and hardness even in 1100 °C.
3. Electrical insulation, non-magnetic, They can also be used in magnetic field.
4. Si3N4 ceramic balls have a low density of 3.26 g/cm3. It is approximately 60%lighter than steel balls, which extremely decrease the centrifugal force on the groove, in order to effectively reduce the wear and tear.
5. High rigidity and strength. Compared with chrome steel, Si3N4 ceramic is twice higher in hardness and half higher in elastic modulus value.
6. The coefficient of thermal expansion of Si3N4 is 3.2×10-6/K. It is nearly 25% of the bearing steel, which leads to a good thermal shock resistance.
7. The self-lubrication of Si3N4 ceramic roller bearings can help to solve the contamination and inconvenient caused by lubricator, it can also be used in vacuum and high temperature.
8. Low thermal conductivity.
Application fields:high precise ceramic bearings, high temperature bearings, vacuum bearings, nonmagnetic bearings, chemical pump, high temperature pump, ceramic valve ball, measure ball.
silicon nitride ceramic roller
1.Specification: 3~ 30mm , with different gauge.
2.Usage: for bearing, inspection, and other rolling conditions.
Physical Properties
Density g/cm3 | Relative density
| Elastic modulus GPa |
Compression strength ratio25
| Hardness GPa |
3.26 | >99.5 | 300-320 | 40-50 | 16 - 20 |
Fracture toughness /MPam1/2 | Bending strength MPa | Poisson's ratio | Linear expansion coefficient 10-6K-1 | Webuller modulus |
6.0-9.0 | 900-1000 | 0.25 | 3.1-3.3 | 12-15 |
Thermal conductivity WmK-1 | Specific resistance ratio | Corrosion resistance | Size stability | Magnetic |
15~20 | 1018 | Excellent | Excellent | NO |
silicon nitride ceramic roller
