TRIBOLOGICAL PAIR AND PROCESS FOR SURFACE TREATMENT IN TRIBOLOGICAL PAIRS.

摘要

The present invention is applied to a tribological pair comprising two metal pieces (10, 20), a first of them having a movable contact surface (10a) which provides friction in relation to a respective contact surface (20a) of a second of said metal pieces (20). According to the present invention, the first metal piece (10) has its contact surface (10a) defined by a coating formed: by a first surface layer (11) in a material harder than that of the first metal piece (10); and by a second surface layer (12), disposed onto the first surface layer (11) and in a material defining a coating which reduces the chemical affinity in relation to the contact surface (20a) of the second metal piece (20) of the tribological pair, in order to provide, to said tribological pair, a lower friction coefficient in relation to the tribological pair deprived of said coating.