Method of manufacturing surface-coated cutting tool with excellent abrasion resistance

A method of manufacturing a surface-coated cutting tool with excellent abrasion resistance comprising the step of:

• forming an aluminum oxide layer having a layer thickness of 0.05 to 5 μm and an α-alumina structure with a corundum type crystal structure on a cutting tool body, which is made of tungsten carbide-based cemented carbide, titanium carbonitride-based cermet, high-speed steel, or cubic boron nitride-based ultrahigh-pressure sintered body, using a sol-gel method,
• wherein the step of forming the aluminum oxide layer comprises the steps of:
• adding alcohol to aluminum alkoxide to prepare a mixture;
• adding acid to the mixture after the step of adding alcohol;
• stirring the mixture at 10° C. or lower to form a sol after the step of adding acid;
• performing application on the cutting tool body and drying of the sol at least once, thereby creating a dried sol layer;
• and
• annealing the cutting tool body with the dried sol layer at a temperature in a range between 500 and 600° C.,
• wherein the sol is applied on a surface of the cutting tool body or an outer-most surface of a hard-coating layer formed on the surface of the cutting tool body in the application of the sol;
• and
• the applied sol is dried at 100 to 400° C. in the drying of the sol.