Regresar

Improvement of the useful life of the machining tool with the carbonitrides multilayer system

Abstract:

Multilayer effect was studied systematically on the carbon-nitride system and its effect on the flank wear of cutting inserts. In this sense, tungsten carbide (WC) inserts were used as substrates to improve their tribological properties. The heterostructure coatings were grown via reactive r.f. magnetron sputtering technique by methodically varying the bilayer period (Λ) and the bilayer number (n) while maintaining constant the total coating thickness (~ 3 μm) of the films. The heterostructures were characterized by transmission microscopy (TEM), and the wear tests were supported by scanning electron microscopy (SEM), and laser interferometry. The results showed that the increase of (n) produced a significant increase of the wear resistance in both laboratory wear tests and in real wear tests. In summary, these results encourage the use of the [TiCN/TiNbCN]n system as coatings for machining tools with a drastic enhancement of the wear life. This work has seldom been addressed in literature focused on the tribological properties of the carbon-nitride system.