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A Carbon Thrust Bearing — also known as a carbon thrust pad or carbon thrust washer — is a bearing used to support axial loads (thrust) in rotating machinery. It handles forces generated by axial movement between rotating and stationary components, providing low-friction, reliable support for smooth operation.
Carbon thrust bearings are made from carbon fibers and graphite particles combined with a binder/resin to form a solid, durable structure. The specific composition varies based on application and load requirements.
In rotating machinery like pumps, turbines, or gearboxes, axial movement between the rotating shaft and stationary housing generates thrust forces that must be managed to prevent excessive wear.
Attached to rotating shaft — moves with the machine
Self-lubricating carbon layer absorbs axial thrust forces
Mounted in housing — provides stable reaction support
Self-lubricating carbon reduces friction between surfaces, resulting in less wear and heat generation during operation.
Carbon thrust bearings can handle high axial loads and are suitable for demanding thrust force requirements.
Natural lubricating properties reduce the need for external lubrication and ongoing maintenance requirements.
Withstands high operating temperatures making them suitable for hot fluid and gas applications.
| Parameter | Unit | WC.CO 6% | WC.CO 11% | WC.NI 6% |
|---|---|---|---|---|
| Density | g/cm² | 14.9 | 14.4 | 14.6 |
| Hardness HRA | kg/mm² | 90.8 | 89.5 | 90.0 |
| Modulus of Elasticity | GPa | 600 | 570 | 610 |
| Fracture Strength (MOR) | MPa | 1800 | 2400 | 1900 |
| Thermal Expansion (CTE) | 10⁻⁶/k | 4.5 | 4.8 | 5.0 |
| Thermal Conductivity | W/(m·k) | 84 | 82 | 96 |
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