Abstract
The poor adhesion between Diamond-like carbon (DLC) coating and substrates has always restricted its application in tooling industry. In this work, DLC coating was produced on the Cr12MoV steel by in-situ duplex plasma nitriding and arc ion plating (AIP) process to improve its adhesion strength. For comparison, DLC coating was also produced only by AIP process. The microstructure and mechanical properties were investigated by field emission scanning electron microscope, X-ray diffraction, Raman spectroscope, X-ray photoelectron spectroscopy and nanoindenter. Rockwell C indentation, scratch test and tribological tests were conducted to evaluate the adhesion and tribological performance of the coatings. The results show that the hardness of the DLC coating is 22.5 Gpa with a sp3 bond concentration 29.9%. The in-situ duplex process improves the adhesion strength of DLC coating with substrates from 6.4 N to 15.2 N, measured by a diamond Rockwell tip with a 100 μm radius tip. The DLC coating by in-situ duplex process exhibits low friction coefficient of 0.08 and low wear rate of 4.32×10−7 mm3/Nm. The in-situ duplex process does not affect the friction coefficient and wear mechanism, while it is expected to improve the wear resistance due to the better load capacity.
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