Graphite and molybdenum disulphide are used as dry lubricants in DryLube bearings. The lubricating properties of these materials result from the lamellar structure that forms under load when the lubricant adheres to the bearing contact surfaces. The layer structure allows the parallel plates to slide. The low adhesion between the plates results in a low shear strength in the direction of displacement, but a high compressive strength perpendicular to the direction of displacement. In addition, a solid lubricant with high compressive strength can withstand high loads without metallic contact occurring. Finally, the dry lubricant has good adhesion to the substrate surface, which means that it remains attached to the bearing surfaces even under high shear loads.

Graphite has even better lubricating properties if there are vapor inclusions between the graphite layers, thus reducing shear forces and friction. Graphite can be used as a lubricant at temperatures well above 500 °C. To further improve the performance or extend the operating life of DryLube bearings, versions are available in which the dry lubrication is combined with additional high-temperature lubricating oil additives and nanoparticles.

Bearing with solid lubricant up to + 350°C

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Source: ihb
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