Microstructures and high-temperature wear performances of cathodic arc ion plating on YT14 cutting tool

A layer of titanium carbon nitride (TiCN) coating was deposited on YT14 cutting tool by a cathodic arc ion plating (CAIP); the friction-wear behaviors of TiCN coating at the temperatures of 200, 300, and 400 A degrees C were investigated by a high-temperature friction-wear tester. The results show that a metallurgical bonding is formed at the TiCN coating interface, of which the bonding strength is 58.15 N measured by scratch test. The average coefficient of friction (COF) of TiCN coating at the temperatures of 200, 300, and 400 A degrees C is 0.2931, 0.5252, and 0.4114, respectively; the wear rates increase gradually with the wear temperatures. The TiO2 that is produced during the wear improves the lubrication of the coating; the wear mechanisms are primarily composed of oxidation wear, abrasive wear, and adhesive wear, accompanied by slight fatigue wear.