Mechanisms of self-lubrication in patterned TiN coatings containing solid lubricant microreservoirs

Guleryuz C. G., Krzanowski J. E.

SURFACE & COATINGS TECHNOLOGY, vol.204, no.15, pp.2392-2399, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 204 Issue: 15
  • Publication Date: 2010
  • Doi Number: 10.1016/j.surfcoat.2010.01.012
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2392-2399
  • Istanbul Technical University Affiliated: Yes


The tribological mechanisms of friction and lubrication have been investigated in TIN coatings patterned to contain microscopic reservoirs for solid lubricant entrapment. Photo-lithography was used to fabricate three sets of samples on silicon wafers, varying the reservoir size (4 and 9 mu m) and spacing (11 and 25 mu m), which resulted in samples with a nominal reservoir area of either 2 or 10%. Pin-on-disk tests were run using lubricants of graphite and indium and counterfaces of alumina and steel (440C). In most cases, the samples with the 9 mu m holes spaced 25 mu m apart gave the lowest friction coefficients and longest wear life. Analysis of the wear tracks by SEM/EDS methods showed carbon to be present in the holes of the graphite/steel counterface samples, but TiO2 was found in the holes of the graphite/alumina counterface samples. For the indium/steel counterface samples indium was detected within the microreservoirs, but iron was also found, transferred from the ball. These experiments highlight a variety of tribological mechanisms that can operate in microreservoir-patterned coatings. (C) 2010 Elsevier B.V. All rights reserved.