Material: Silicon nitride ceramic
Density: 3.23-3.27g/cm³
Color: Black & Gray
Grade: G3~G100
Specification: φ0.6-φ110mm
Sintering process: HIP&GPS
Si3N4 ceramic balls is a precision ceramic sintered at high temperature in a non-oxidizing atmosphere,with high strength, high wear resistance, high temperature resistance, high corrosion resistance , can be used in seawater for a long time, and have good electrical and magnetic insulation properties. At 1000℃, the strength and hardness remain almost unchanged. Its density is 3.23g/cm³, which is almost 1/3 of the weight of bearing steel. The centrifugal force is small during rotation, which can realize high-speed operation. It also has self-lubricating properties and can be used in highly polluted environments without lubricating media. It has become the preferred ball for ceramic bearings.
Silicon nitride ceramic ball performance parameters | ||||
Project | Unit | Si3N4 | ||
Density | Mg/m³ | 3.23~3.27 | ||
Mechanical strength
| Hardness | HV（20kgf） | / | 1400~1500 |
Flexural Strength 3-point bending | Normal temperature | MPa | 900 | |
1000℃ | MPa | 750 | ||
1200℃ | MPa | 450 | ||
Compressive strength | Normal temperature | MPa | 4000 | |
| Thermal properties | Young's modulus | Normal temperature | GPa | 308 |
Poisson's ratio | / | / | 0.29 | |
Fracture toughness | MPa･m^½ | 6~8 | ||
Specific Heat | J/kg･K | 670 | ||
Thermal conductivity | W/m･K | 28 | ||
Coefficient of thermal expansion | RT-800℃ | ×10-⁶/K | 3.0 | |
Thermal shock temperature difference | （△Tc） | ℃ | 600 | |
Electrical Characteristics | Dielectric strength | 50Hz | kV/mm | ＞14 |
Volume resistivity | 25℃ | Ω･ｍ | >10¹² | |
Corrosion resistance | Acidic | / | / | excellent |
Alkaline | / | / | excellent | |
Features:
Lightweight, wear-resistant, long life, high strength, self-lubricating, electrical insulation, etc., it demonstrates reliability and safety in application environments that require high speed, maintenance-free, and anti-electrical corrosion.
Application:
High-speed/ultra-high-speed bearings, machine tool spindles, electric vehicles, wind power generation, motors, X-ray CT, aerospace, semiconductor vacuum pumps; can also be used as valve balls and measuring balls in chemical pumps, high-temperature pumps, and metering pumps.
Specifications and dimensions of Si3N4 bearing balls for different purposes | ||
Serial number | Use | Specification |
1 | Dental drill bearings | 1mm |
2 | Precision Machine Tools | 3.969mm(5/32in)、6.35mm(1/4in)、7.938mm(5/16in)、9.5mm(3/8in) |
3 | Semiconductor vacuum pump | 9.5mm(3/8in)、11.9mm(15/32in) |
4 | Electric Vehicles | 4mm(5/32in)、4.8mm(3/16in)、8mm(5/16in)、8.7mm(11/32in)、11mm(7/16in) |
5 | Wind power | 47.625mm(1-7/8in)、48.419mm(1-29/32in) |
6 | Motor | 1.59mm(1/16in)、4mm(5/32in) |
7 | X-ray CT | 12.7mm(1/2in) |
8 | Aerospace | 2.5mm(1in about) |
9 | miniature | 0.5mm~1.5mm |
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