Tribometers can be used to investigate the friction and wear behavior of material pairings. A test material, e.g. a steel ball or a pin, is moved on a circular path over the specimen with a defined standard force (approx. 5 N) (pin-on-disk). During the test, the friction force or the coefficient of friction is measured continuously. The wear is subsequently determined by measuring the wear track and the abrasion of the test specimen.
Friction and wear are not material values.In addition to the material pairing, they also depend on the test parameters:
We will be pleased to advise you on the optimum choice of test conditions.
DLC coatings containing metal have a significantly reduced frictional resistance to steel compared to uncoated surfaces. Even when operating under oil, metal DLC coatings still improve the coefficient of friction compared to steel against steel.
A TiN coating is generally harder than a DLC coating and therefore offers good wear protection compared to uncoated steel. In moving components, however, a DLC coating offers a coefficient of friction that is many times lower than that of TiN or uncoated steel, especially when running without lubrication.