Si3N4 Silicon Nitride Ceramic Bearings High Speed 36000rpm 688 689 687 686 685 684
680 Series Miniature Ceramic Deep Groove Balls Bearings Of ZrO2/Si3N4/SSiC
Why choose us:
In addition to the mass production types-608, our company can according to the different needs of users, custom-make all ceramic bearings and hybrid ceramic bearings with ceramic balls of all precision levels, customized size range can be: inner diameter from 5 to 120mm, outer diameter from 10 to 200mm, including special non-standard size, special non-standard clearance, pairing and universal pairing angular contact high-speed, super high-speed bearings with ceramic ball and etc.
Performance advantages of ceramic material:
| ►Key properties of zirconia |
| ♦ Max Temperature up to 380℃ |
| ♦ High density: 6.09 g/cm3 |
| ♦ Low thermal conductivity |
| ♦ Chemical stability, resistance to acid and alkali corrosion |
| ♦ High fracture toughness KIC:8-11 MPa-m1/2 |
| ♦ Good electric insulation |
| ♦ Better bearing capacity |
| ♦ Wear resistance |
| ♦ High hardness : 1300 HV5 |
| ► Key properties of hot isostatic sintered silicon nitride |
| ♦ Max temperature to 1000℃ |
| ♦ High strength over a wide temperature range |
| ♦ High fracture toughness: 6.1 MPa-m1/2 |
| ♦ High hardness: 1580 HV5 |
| ♦ Outstanding wear resistance, both impingement and frictional modes |
| ♦ Good thermal shock resistance |
| ♦ Good chemical stability,resistance to acid and alkali corrosion |
| ♦ Good electric insulation |
| ►Key properties of pressureless sintered silicon carbide |
| ♦ Max Temperature up to 1650℃ |
| ♦ Low density:3.15-3.18 g/cm3 |
| ♦ High strength |
| ♦ Low thermal expansion : 4.0 (10-6/℃) |
| ♦ High thermal conductivity:120 W/m°K |
| ♦ High hardness:2800 HV5 |
| ♦ High elastic modulus: 410GPa |
| ♦ Superior chemical stability,resistance to acid and alkali corrosion (incld. hydrofluoric acid) |
Reference data of 680 series Miniature Ceramic Deep Groove Balls Bearings:
| Bearings model | Form size d (mm) |
Form size D (mm) |
Form size B (mm) |
Load Cr (N) |
Load Cor (N) |
Max.Speed Grease (rpm) |
Max. Speed Oil (rpm) |
| 684CE | 4 | 9 | 2.5 | 564 | 227 | 53000 | 63000 |
| 685CE | 5 | 11 | 3 | 630 | 282 | 45000 | 53000 |
| 686CE | 6 | 13 | 3.5 | 952 | 442 | 40000 | 50000 |
| 687CE | 7 | 14 | 3.5 | 1032 | 513 | 40000 | 50000 |
| 688CE | 8 | 16 | 4 | 1102 | 592 | 36000 | 43000 |
| 689CE | 9 | 17 | 4 | 1168 | 668 | 36000 | 43000 |
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