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Micro ceramic bearing balls for electronic devices are core precision components adapted to micro bearings, featuring "small size, high performance, and high reliability". They are specifically designed for electronic devices such as mobile phones, drones, micro motors, and sensors.
Zirconia bearing balls have replaced traditional steel balls in specific application fields due to their excellent performance. Zirconia ceramics boast high toughness, high flexural strength, excellent heat insulation performance, and a thermal expansion coefficient close to that of steel, enabling perfect combination with metals. Compared with traditional bearing materials like steel, they have a much lower density, which can effectively reduce the weight of bearings.
Their surface friction coefficient is low, and they are less likely to generate lubricants, friction dust, and other substances, making them more stable for high-speed rotating bearings. Moreover, they have good wear resistance; relying on high toughness and high flexural strength, they can effectively reduce friction loss and wear. They can withstand relatively high rotational speeds and loads while maintaining good stability. However, their performance may be affected under extreme temperature conditions. Meanwhile, zirconia bearing balls exhibit excellent corrosion resistance and oxidation resistance, especially performing well in some acid-base environments. They also have excellent insulating properties, thus finding wide application in some special electrical equipment.
| Parameter | Zirconia Ceramic (YSZ) |
|---|---|
| Material | Yttria-stabilized zirconia |
| Diameter Range | 0.5 mm – 3 mm |
| Sphericity | ≤0.001 mm |
| Surface Roughness (Ra) | ≤0.02 μm |
| Density | 6.0–6.2 g/cm³ |
| Hardness (Vickers) | ≥1200 HV |
| Fracture Toughness | ≥8 MPa·m¹/² |
| Thermal Expansion Coeff. | ~10 × 10⁻⁶ /°C (20–300°C) |
| Max Operating Temperature | 300°C |
| Corrosion Resistance | Excellent (acids, alkalis) |
| Insulation | Electrically insulating |
