Effect of Deposition Temperature on the Tribological Properties of CrN Coatings under Dry Friction and Soybean Oil Lubrication Conditions
To investigate the effect of deposition temperature on the tribological properties of CrN coatings,find a green lubricant suitable for the coatings,the CrN coatings were prepared by magnetron sputtering technique at different deposition temperatures.Their microstructure,mechanical properties,as well as friction and wear properties were evaluated by using X-ray diffraction,scanning electron microscope,atomic force microscope,scratch tester,nano-indentation and tribotester respectively.The results show that the CrN coatings deposited at 250 ℃ have the densest crystalline structure and the best mechanical properties.Tribological experiments show that the CrN coatings deposited at 250 ℃ exhibit the optimum tribo-logical properties under both dry friction and soybean oil lubrication conditions.XPS analysis shows that the soybean oil un-dergoes a tribochemical reaction due to the presence of friction and forms a chemisorbed film on the coating surface.This film effectively reduces the friction and wear of the coatings.CrN coatings deposited at 250 ℃ have the optimum mechani-cal and tribological properties,and soybean oil is an excellent lubricant for CrN coatings.
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