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 Ceramic Bearing Call
Edgetech Industries offers Silicon Nitride Bearing Balls within a variety of diameters and precisions.
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.
Specification of the Silicon nitride-bearing balls
Level: G5-G100
Specifications: Dia. 0.3mm – Dia. 140mm
Silicon Nitride Bearing Balls Description
| item | Unit | Si3N4 |
| Physical Property | ||
| Color | \ | Gray Black |
| Density | g/cm3 | >3.2 |
| Mechanical properties | ||
| Rockwell hardness | HRA90 | |
| Vickers hardness (Hv50) | HV0.5 | >1550 |
| Elastic modulus (20℃) | Gpa | 290 |
| Bending strength(20℃) | Mpa | >600 |
| Compressive strength (20℃) | Mpa | 2500 |
| Fracture toughness (20℃) | Mpam1/2 | >6.0 |
| Thermal properties | ||
| Thermal conductivity | W/(m·K) | 15-20 |
| Coefficient of thermal expansion（20℃-1000℃） | 10-6K-1 | >3.1 |
| Thermal shock stability | △T℃ | 500 |
| Specific heat capacity | KJ/kg.K | 700 |
| Maximum operating temperature（in air） | ℃ | 1200 |
| Electrical properties | ||
| Dielectric strength (insulation strength) | KV/mm | 1 |
| Volume resistance (20℃) | Ω.cm | 10^12 |
* 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 temperatures and could survive most of the corrosive chemicals. Si3N4 bearing balls have already been applied in automobiles, rockets high-speed engines, equipment working in corrosive environments, and some performance model cars.
Application of the Silicon Nitride bearing balls
Silicon nitride ceramic balls can be used in various bearings with extreme performance requirements: high-speed/ultra-high-speed bearings, high-precision bearings, vacuum bearings, high/low-temperature bearings, non-magnetic bearings, high-precision ball screws; they can also be used in chemical pumps It is used as valve ball, swimming valve, fixed valve and measuring ball in high-temperature pumps and metering pumps.
Silicon nitride ceramic balls are generally assembled into hybrid bearings and can be used in high-tech industries such as aviation, defense, and other industries. They can also be widely used in the chemical industry, metallurgy, medical, food, oil fields, electronics, and other industries.
Packing
Silicon nitride bearing balls use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.
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