Cutting tool

A cutting tool comprising a substrate and a coating provided on the substrate,

• the coating including
• an alumina layer provided on the substrate,
• an intermediate layer provided directly on the alumina layer, and
• a titanium carbonitride layer provided directly on the intermediate layer,
• the intermediate layer being made of titanium oxycarbonitride,
• the titanium carbonitride layer being made of a compound represented by TixCyN(1-y),
• at a point A 0.2 μm away from an interface I between the intermediate layer and the titanium carbonitride layer in a depthwise direction toward the titanium carbonitride layer,
• the titanium carbonitride layer having an atomic ratio xA of 1.3 or more and 1.6 or less for titanium,
• the titanium carbonitride layer having an atomic ratio yA of 0.4 or more and 0.6 or less for carbon,
• at a point B 1.0 μm away from an interface J at the titanium carbonitride layer opposite to the interface I in the depthwise direction toward the titanium carbonitride layer,
• the titanium carbonitride layer having an atomic ratio xB of 0.8 or more and 1.2 or less for titanium,
• the titanium carbonitride layer having an atomic ratio yB of 0.3 or more and 0.5 or less for carbon,
• at a point C that is a midpoint between the point A and the point B,
• the titanium carbonitride layer having an atomic ratio xC larger than the atomic ratio xB and less than the atomic ratio xA for titanium,
• the titanium carbonitride layer having an atomic ratio yC larger than the atomic ratio yB and less than the atomic ratio yA for carbon,
• the intermediate layer having a thickness of 0.5 μm or more and 1.5 μm or less,
• the titanium carbonitride layer having a thickness of 1.5 μm or more and 3.5 μm or less.