Cutting Tool, Manufacturing Method Thereof and Cutting Method

A method of manufacturing a cutting tool, wherein

• the cutting tool has a substrate and a coating layer deposited on a surface of the substrate, and
• the coating layer includes at least a titanium nitride layer deposited on the surface of the substrate, a titanium carbonitride layer deposited on the surface of the titanium nitride layer, an intermediate layer deposited on the surface of the titanium carbonitride layer and an aluminum oxide layer deposited on the surface of the intermediate layer,
• the method comprising:
• the preprocessing step of retaining the substrate in a CVD furnace by introducing a mixed gas prepared by mixing H2 in the range of 50 to 75 vol % and N2 in the range of 25 to 50 vol %, totaling 100 vol %, while performing control so that a Vg/Vr (L/min) is 0.1 to 0.3 (L/min), where Vg (L·min) is the volume (flow rate) of the introduced gas at room temperature and atmospheric pressure, and Vr (L) is the volume of the inside of the CVD furnace;
• the titanium nitride layer forming step of depositing a titanium nitride layer on a surface of the substrate;
• the mid-processing step of retaining the substrate provided with the titanium nitride layer in the CVD furnace by introducing into the CVD furnace a mixed gas prepared by mixing H2 in the range of 50 to 75 vol % and N2 in the range of 25 to 50 vol %, totaling 100 vol %, while performing control so that the Vg/Vr (L/min) is 0.1 to 0.3;
• (L/min);
• the titanium carbonitride layer/intermediate layer forming step of sequentially depositing a titanium carbonitride layer and an intermediate layer on the titanium nitride layer;
• the post-processing step of retaining the substrate provided with the intermediate layer by introducing a mixed gas prepared by mixing AlCl3 in the range of 1 to 15 vol % and H2 in the range of 85 to 99 vol %, totaling 100 vol %;
• and
• the aluminum oxide layer forming step of depositing an aluminum oxide layer on the intermediate layer.