Tribological properties of Ti2N-Wx% coatings deposited by magnetron sputtering

Ti2N-Wx% coatings with different tungsten contents were deposited using unbalanced magnetron sputtering technology. The microstructures and mechanical properties of Ti2N-Wx% coatings have been characterized by SEM, X-ray diffraction (XRD), nanoindentation and adhesion techniques. The tribological performance of the coatings was investigated using an oscillating friction and wear tester under dry conditions. Indexable inserts with Ti2N-Wx% coatings were applied to turning AISI 1045 steel material by a lathe. Micron-drills with Ti2N-Wx% coatings were adopted in the ultra-high speed (105 rpm) Printed Circuit Board (PCB) through-hole drilling test. Experimental results indicate that the coating microstructure, mechanical properties and wear resistance vary according to the tungsten content. Ti2N-W14% coated inserts showed the best wear resistance in 1045 steel turning and PCB through-hole drilling tests. The service life of a Ti2N-W14% coated tool is five times greater than that of an uncoated tool in PCB through-hole drilling test.