Properties of a composite multilayered hard coating Zr–ZrN

Abstract

Mechanical and tribotechnical characteristics of composite multilayered coatings Zr–ZrN in air at temperatures from 20 to 900°C have been determined. The coefficient of friction of the Zr–ZrN coating against steel 65G has been found to exhibit a tendency toward decreasing as the velocity is lowered and the load is raised from 10 to 30 kgf. A study of properties of the coatings in the range between 20 and 900°C has demonstrated that hardness under a load of 1 kgf goes down gradually from 19 to 3.2 GPa. Hardness along the friction trace has been found to grow from 23 to 25 MPa, while hardness of the counterbody has increased twofold (from 4.5 to 9.0 GPa). The coefficient of friction of the composite multilayered coating Zr–ZrN against diamond at a velocity of 16 mm/s has been determined to range between 0.26 and 0.28.