Growth and characterization of a novel multi gradient diamond likecarbon coating
In this paper,Cr/Cr-WC/WC-H/ta-C:H multi-gradient coating was deposited on the Cr12MoV sub-strate.The microstructure of the multi-gradient diamond like carbon(DLC)coating was characterized by scan-ning electron microscopy(SEM),Raman spectrometry,and X-ray photoelectron spectroscopy(XPS).The me-chanical properties of coating were investigated by using nanoindentation tester,nano-scratch tester,and ball-and-disc tribometer.The results show that compared with the Cr12MoV without deposited coating,the friction coefficient of Cr/Cr WC/WC-H/ta-C:H multi gradient coating is about 10％,as low as 0.019.The hardness of Cr/Cr WC/WC-H/ta-C:H(DLC)coating can reach up to 24.1 GPa,with a high adhesion of 62 N.A new multi-layer gradient coating was designed,which introduces a high lubricity amorphous carbon and hard suppor-ted WC layer.It suppresses crack propagation,and significantly improves the mechanical properties of Cr12MoV.In addition,electrochemical corrosion tests showed that the Cr/Cr-WC/WC-H/ta-C:H multi-gradi-ent coatings had superior corrosion resistance in 3.5％NaCl solution.
diamond like carbon coatingTa-C:Hnew multi-gradientCr12MoV steel
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