2009•Materials Research and ApplicationRequires access
Tribological behavior of chromium oxide coatings under dry friction and water lubrication conditions
Zhi Li
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Abstract
The tribological properties of magnetron sputtering chromium oxide coating sliding against Si3N4 ceramic ball under dry friction and water-lubricated condition were investigated on an UMT tribological tester.The morphology of the worn surface and the elemental composition of the wear debris were examined by means of Energy Disperse Spectroscopy(EDS) and secondary ion mass spectroscopy(Tof-SIMS).It has been found that friction and wear rate of chromium oxide coating can be effectively decreased by water lubrication because of the change of the main wear mechanisms caused by water lubrication.Tribo-chemical reaction of chromium oxide coating took place under water lubrication.With the generation of the protective film composed of chromium hydroxide formed on the worn surface,the wear mechanisms changed from adhesive wear under dry friction to tribo-chemical and abrasive wear under water lubrication.