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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.
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.
Bush bearing of Silicon nitride and carbon nitride can work in extreme environments such as chemical, petroleum, marine, metallurgy, energy sectors and so on due to their special features of corrosion resistance, high temperature stability, wearable, non-magnetic, insulating, oil-free self-lubricating and so on. In addition, carbon nitride bearings can be used to canned pump and magnetic pump.
material:silicon nitride, carbon nitride
usage:seal
CHARACTERISTICS
Density g/cm3 | Relative density
| Elastic modulus GPa |
Compression strength ratio25
| Hardness GPa |
3.26 0.02 | >99.5 | 300320 | 4050 | 16 - 20 |
Fracture toughness /MPam1/2 | Bending strength MPa | Poisson's ratio | Linear expansion coefficient 10-6K-1 | Webuller modulus |
6.09.0 | 9001000 | 0.25 | 3.13.3 | 1215 |
Thermal conductivity WmK-1 | Specific resistance ratio | Corrosion resistance | Size stability | Magnetic |
15~20 | 1018 | Excellent | Excellent | NO |
bush bearing of ceramic