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Scuffing Performance of a Hard Coating Under EHL Conditions at Sliding Speeds Up to 16 m/s and Contact Pressures Up to 2.0 GPa

[+] Author Affiliations
R. W. Snidle

Cardiff University, Cardiff, UK

A. K. Dhulipalla, H. P. Evans

Cardiff University, Cardiff, Wales

C. V. Cooper

United Technologies Research Center, Arlington, VA

Paper No. DETC2007-34111, pp. 697-715; 19 pages
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 7: 10th International Power Transmission and Gearing Conference
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4808-6 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME


Scuffing experiments were conducted using 76 mm diameter disks both with and without a metal-containing, carbon-based hard coating. The operating conditions in the experiments were severe with sliding speeds up to 16 m/s and maximum Hertzian contact pressures up to 2.0 GPa. The disks were of alloy steel which was case-carburised and hardened followed by axial grinding. Four different surface conditions were investigated as follows: ground/un-coated; ground/coated; superfinished/uncoated; superfinished/coated. Experiments were also carried out in which ground/coated disks were run against ground/uncoated disks. The results of the experiments show that the addition of the hard coating to the ground disks significantly improved both their scuffing resistance and frictional behavior, but the coating was less effective in producing an improvement in the durability and friction of the superfinished disks.

Copyright © 2007 by ASME



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