Increasing the efficiency of turning nickel alloys by using multilayer-composite coatings Zr-ZrN-(Zr,Mo,Al)N, Ti-TiN-(Ti,Mo,Al)N or Cr-CrN-(Cr,Mo,Al)N

To improve the efficiency of nickel alloy turning with carbide inserts, three types of coatings were used: (Zr,Mo,Al)N, (Ti,Mo,Al)N or (Cr,Mo,Al)N. The cutting process and the nature of wear were studied at various speeds (40 - 90 m/min). At lower speeds (45 and 60 m/min), the tool with (Ti,Mo,Al)N or (Cr,Mo,Al)N coatings turned out to be the most effective. With an increase in cutting speed (up to 75 and, especially, 90 m/min), the efficiency of a tool coated with (Zr,Mo,Al)N increases, which can be associated with the formation of tribologically active zirconium and molybdenum oxides. Another important factor is the good brittle fracture resistance of the (Zr,Mo,Al)N coating.