P11...maintenance-free and robust
P11 is a leaded, robust sliding material with maximum tribological performance. It is designed for maintenance-free, dry-running applications, but can also be employed in systems with liquid lubrication. The use of grease as a lubricant with P11 is only possible to a limited extent, and is not recommended.
The solid lubricant mass is produced in a specially adapted mixing process. In a parallel, continuous sintering operation, bronze powder is sintered onto the steel or bronze back as a sliding layer. This produces a sliding layer with a thickness from 0.2 mm to 0.35 mm and a pore volume of approx. 30 %. Next, the cavities are filled with solid lubricant by means of impregnating rollers.
This process step is controlled in such a way that a running-in layer of solid lubricant up to max. 0.03 mm thick is produced above the sliding layer. In further thermal treatments, the characteristic properties of the material system are adjusted, and the required thickness tolerances of the composite material are produced using controlled roller pairs.
Important!The materials P11 contain lead and must therefore not be used in the food sector!
Standard designs are:
In a final step, plain bearings manufactured from P10 undergo corrosion protection treatment on the bearing back, face reliefs and striking faces.
Standard version: Tin
layer thickness: approx. 0.002 mm
Additionally, P10 plain bearings can be supplied with improved corrosion protection coating “Zinc, transparent passivated”, on request.
P11 does not require any additional corrosion protection.
Note:Tin is used as temporary corrosion protection and an assembly aid.
Material P11 is recommended for more stringent requirements in terms of corrosion resistance or for use in aggressive media.
It has some advantages over P10 in this respect:
- Very good thermal conductivity and therefore greater reliability
Use in hydrodynamic conditions is possible without problems up to a sliding speed of 3 m/s. Continuous operation of over 3 m/s runs the risk of current erosion or cavitation. Motorservice offers the calculation of hydrodynamic operating conditions as a service.