Abstract
TiN, Ti(B,N) and TiB 2 hard coatings have been deposited on steel substrates by means of r.f. sputtering. The fundamental coating properties, such as the structure, adhesion, hardness, internal stresses and chemical composition, have been determined. The coatings have been tested with regard to their tribological behaviour by means of unlubricated pin-on-disc model wear tests under an ambient atmosphere as well as under vacuum conditions. Balls made of ball bearing steel and high speed steel have been used as pin materials. It was found that the dominant type of chemical bonding within the film is an important coating property with regard to the wear behaviour under pin-on-disc test conditions. It is shown that TiB 2 films are of limited benefit in a sliding contact against steel. Ti(B,N) and the well-known TiN are much more promising coating materials.
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