Method for making cutting tool for machining titanium alloy or superalloy

A method for making a cutting tool for machining titanium alloy or superalloy, the cutting tool comprising a Me-B—N coating, Me being one or more elements selected from the transition metals V, Nb, Ta, and Mo, the atomic percentages of each element being as follows:

• Me:
• 8-40%, B:
• 15-60%, and N:
• 10-65%, and the Me-B—N coating comprising a MeNx phase and a BN phase, the method comprising:
• introducing pure N2 and Ar into a chamber comprising a heater and a substrate, keeping a temperature of the heater constant, applying a back bias voltage on the substrate, and forming a Me-B—N coating on the substrate by magnetron sputtering technology;
• wherein:
• a flow ratio of pure N2 to Ar is 0.06-0.25;
• a pressure in the chamber is 0.4-4 pascal;
• and the temperature of the heater in the chamber is in a range of 300-600° C.;
• and
• a Me-B target is adopted, and a planet carrier supporting the substrate is connected to a negative pole of a power supply;
• a rotating speed of the planet carrier is 3 rpm, the back bias voltage is −50 to −300 V, and a time for coating is 60-300 min.