CUTTING TOOL HAVING HARD COATING WITH EXCELLENT WEAR RESISTANCE AND TOUGHNESS

WIPO Patent Application WO/2023/090620

A1

The present invention provides a cutting tool having a hard coating capable of satisfying various physical properties such as wear resistance, toughness, oxidation resistance, and heat crack resistance in a well-balanced manner. In order to achieve the above purpose, the present invention provides a cutting tool that includes a hard substrate and a hard coating formed on the hard substrate, wherein the hard coating has the structure in which two or more sub-coatings having the composition range represented by the following [chemical formula 1] and being different in lattice constant are alternately laminated. [Chemical formula 1] Al(1-x-y-z)TixZryMezCaObN(1-a-b) (0