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
| Size | 1-30mm diameter |
| Color | Black |
| Density | 3.22 g/cm3 |
| Flexural strength | 800 MPa |
| Fracture toughness | 6.5 MPa m^1/2 |
| Thermal stress parameters | 569 K |
Data Sheet & Typical properties of silicon nitride material:
| Item | Unit | Si3N4 |
| Type | – | Gas pressure sintered |
| Density | g/cm3 | 3.22 |
| Color | – | dark grey |
| Water Absorption | % | 0 |
| Young Modulus | Gpa | 290 |
| Vickers Hardness | Gpa | 18 – 20 |
| Compressive Strength | Mpa | 2200 |
| Flexural Strength | Mpa | 650 |
| Thermal Conductivity | W/m.K | 25 |
| Thermal Shock Resistance | Δ(°C) | 450 – 650 |
| Max. Working Temp. | °C | 1200 |
| Volume Resistivity | Ω ·cm | > 10^14 |
| Dielectric Constant | – | 8.20 |
| Dielectric Strength | kV/mm | 16 |
| * 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
| Si3N4 | Steel | |
| Working temperature | 800 ℃ | 180 ℃ |
| Density | 3.21g/cm3 | 7.8 g/cm3 |
| Thermal expansion coeff. | 3.4×10-6 | 12.5×10-6 |
| Hardness, HV | 1500 | About 750 |
| Young’s Module | 320GPa | 208GPa |
| Corrosion resistance | Good | Poor |
| Thermal conductivity | Poor | Good |
| Magnetism | No | Yes |
| Wear resistance | Excellent | Good |
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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