MICROSTRUCTURES AND HIGH-TEMPERATURE TRIBOLOGICAL BEHAVIORS OF MAGNETRON SPUTTERED DLC COATINGS

A diamond-like carbon (DLC) coating was deposited on YT14 cemented carbide cutting tools using an MS (magnetron sputtering), and the surface–interface morphologies, phases, and bonding energy of the obtained coatings were investigated using a scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. The wear behaviors of DLC coatings were measured using a high temperature wear tests. The results show that the sp2 and sp3 appear at 284.4, and 285.3eV, respectively, the DLC coating is composed of the crystal planes (111) and (220). The average COF of DLC coatings at 750, 800, and 850∘C was 0.1956, 0.2082, and 0.4085, respectively, the wear depth increases with the wear temperatures increasing: At 750∘C, the diamond planes (111) and (222) remained, while at 800 and 850∘C, only the diamond plane (111) still remained, the diamond plane (220) was oxidized, resulting in wear capability decreasing. The wear mechanism was composed of abrasive wear, delam...