CrN/(Ti,Al,Zr,Cr)N bilayer films were successfully deposited on cemented carbide (WC-8％ Co) substrates by multi-arc ion plating process using two Ti-Al-Zr alloy targets and one pure Cr target.As a result of bilayered structure and addition of alloying elements (e.g.Al and Cr),the films exhibited excellent high temperature oxidation resistance under both short-term isothermal (up to 800 ℃) and long-term cyclic (up to 600 ℃) exposure conditions.Combined with pre-established outstanding tribological properties (e.g.maximum hardness of 4000 HV0.01 and maximum adhesion strength over 200 N),these observations make such films quite a promising candidate to extend the cutting tool life span and boost the performance in high-productivity,high-speed and high-feed cutting or in dry machining conditions.
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