Combined steered cathodic arc/unbalanced magnetron grown C/Cr nanoscale multilayer coatings for tribological applications

HOVSEPIAN, P. E., LEWIS, D. B., CONSTABLE, C., LUO, Q., KOK, Y. N. and MUNZ, W. D. (2003). Combined steered cathodic arc/unbalanced magnetron grown C/Cr nanoscale multilayer coatings for tribological applications. Surface and Coatings Technology, 174, 762-769.

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C/Cr nano-scale multilayer coatings have been produced by the combined steered cathodic arc/unbalanced magnetron sputtering technique. The coating was deposited by non-reactive unbalanced magnetron sputtering from three graphite targets and one chromium target at deposition temperatures of 250, 350 and 450 C. In scratch adhesion tests C/Cr coatings deposited on M2 HSS showed values exceeding critical load of 70 N. The XRD and TEM analysis revealed the amorphous nature of the coatings. Higher deposition temperatures led to an increase in crystallinity. Raman spectroscopy also showed that the amount of the carbon disorder depends on the deposition temperature, increasing from 68 to 86% for deposition temperatures of 250 and 450 C, respectively. In pin-on-disc tests, C/Cr coatings exhibit a low coefficient of friction of between 0.1 and 0.2, when sliding against 100Cr6 steel ball. These low values were retained for tests in air, de-ionised water and engine oil. Remarkably low sliding wear coefficients of 2 x 10(-17) m(3)/Nm for the coating and 1 x 10(-19) m(3)/Nm for the counterpart were measured after 22.6 km sliding distance. However, the increased crystallinity of the coatings produced at higher deposition temperature leads to an increase in the friction coefficient. The C/Cr coatings, used as an overcoat on TiAlCrYN coated cemented carbide end mills, led to reduction of the rake and the flank wear rates by factor of 7 when machining extremely abrasive Ni based alloys. (C) 2003 Elsevier Science B.V. All rights reserved.

Item Type: Article
Additional Information: 8th International Conference on Plasma Surface Engineering SEP 09-13, 2002 GARMISCH PARTENKI, GERMANY
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Materials Analysis and Research Services
Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
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Page Range: 762-769
Depositing User: Ann Betterton
Date Deposited: 15 Feb 2010 15:42
Last Modified: 18 Mar 2021 02:17

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