抄録
Alternated a-C/a-C : Cr (about 2.5μm thickness) coatings were made by DC magnetron sputtering from graphite and Cr target in an argon discharge. Mechanical and tribological properties were measured by indentation, scratch and pin-on-disc test. The critical scratch load of a-C/a-C : Cr multilayer coatings for total failure is approach 100N. The friction coefficient remains within the range of 0.08-0.1 at loads between 10 and 40N during a pin-on-disc wear test. The wear depth only reaches 0.6μm after a one hour wear test. The surface of a-C/a-C : Cr multilayer coatings undergoes cyclic deformation, and failure eventually occurs as a result of fatigue. The greater compliance and fracture toughness of the a-C/a-C : Cr multilayer coatings allows greater strains or strain energy to be stored before coating failure, and hence significantly improves wear resistance
