Journal
DIAMOND AND RELATED MATERIALS
Volume 116, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108400
Keywords
Plasma nitriding; DLC; Mechanical properties; Friction; Wear
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The duplex treatment of plasma nitriding and deposition of different diamond-like carbon films significantly improved the hardness and reduced the wear rate of CF170 steel. Additionally, it resulted in a low friction coefficient, showing promise for enhancing the tribological properties of the material.
In order to improve the surface hardness and tribological properties of CF170 steel, a duplex treatment including plasma nitriding and deposition of different diamond-like carbon (DLC) films was carried out on CF170 steel. The structural, mechanical and tribological properties of untreated, plasma nitrided and duplex-treated samples were investigated by methods of XRD, SEM, AFM, Raman spectroscopy, XPS, hardness tester, scratch tester and ballon-disc tribometer, respectively. Raman spectroscopy and XPS revealed that the Ti/a-C/(ta-C) film had the highest amount of sp3 content, followed by Cr/WC/(a-C:H) and Cr/WC/(a-C:H:W) films. The hardness of duplextreated samples was significantly higher than that of single plasma nitrided sample and the highest value was obtained from the Ti/a-C/(ta-C) film deposited on the plasma nitrided sample. The critical adhesion load (Lc3) of the Cr/WC/(a-C:H) film deposited on the plasma nitrided sample was obviously higher than that of the Ti/a-C/ (ta-C) film deposited on the plasma nitrided sample. The duplex-treated samples showed a low friction coefficient. Both Cr/WC/(a-C:H) and Ti/a-C/(ta-C) films deposited on plasma nitrided samples had a low wear rate. The wear rate of the Cr/WC/(a-C:H) film deposited on the plasma nitrided sample was reduced by one (five) orders of magnitude compared to the plasma nitride (untreated) sample.
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