Coefficient of friction of iglidur materials

Coefficient of friction and surfaces

Shown here is the relationship between coefficient of friction and surface finish of shaft materials. It is clearly shown that the amount of friction is composed of different factors.

If the shaft is too rough, abrasion levels play an important role. Small areas of unevenness that can interlock with each other must be worn off the surface. When the surfaces are too smooth, however, higher adhesion results, i.e. the surfaces stick to each other. Higher forces are necessary to overcome the adhesion, which results from an increased coefficient of friction.

The stick-slip effect can be the result of a large difference between static and dynamic friction and of a higher adhesive tendency of mating surfaces. It also occurs due to intermittent running behaviour and can result in loud squeaking. People have observed over and over again that these noises do not occur or can be eliminated with rough shafts. With applications with great potential for the stick-slip effect, such as those involving slow movements or large resonance of the housings, it is important to pay attention to the optimal surface finish of the shafts.

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