FRICTION AND WEAR CHARACTERISTICS OF TIN, TICN ACID DIAMOND-LIKE CARBON-FILMS

Friction and wear of TiN, TiCN and diamond-like carbon (DLC) films wer e studied experimentally using a ball-on-disk tribometer. The rider wa s a ball of 100C6 steel or polycrystalline alumina. Two steel substrat es with different hardnesses were used (250 and 880 HV). When the stee l ball is in sliding contact against the films, the results show that friction coefficient is not affected by the hardness of the substrate. For TiN and TiCN, adhesion takes place at the interface followed by m etal transfer onto the films; transfer from the coating to the steel b all was detected in the case of the DLC. When the rider was an alumina ball, the experimental results show that the friction coefficient and wear of the coatings depend strongly on the hardness of the substrate .