Patent ID: 8895110

Claim:
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.