Abstract: The present invention relates to a cutting tool composed of a hard base material, such as cemented carbide, cermet, ceramic, and cubic boron nitride, and a hard coating film formed on the hard base material. A hard coating film for a cutting tool according to the present invention is formed in a multi-layered structure on a base material of a cutting tool, wherein the hard coating film includes one or more layers of a coating film made of an oxide and one or more layers of a coating film made of a nitride, and is characterized in that the O/(O+N) ratio in an edge center of the cutting tool is lower than the O/(O+N) ratio in a region 100 ?m or further away from the edge center in the entire hard coating film.

Abstract: The present invention relates to a cutting tool consisting of a hard base material, such as cemented carbide, cermet, ceramic, and cubic boron nitride, and a hard coating film formed on the hard base material. In the cutting tool according to the present invention, the hard coating film, which is composed of a monolayer or multilayer structure, is formed on a base material, wherein the hard coating film comprises a layer composed of an oxide, wherein in the layer composed of an oxide, the oxygen content of an edge center of the cutting tool is higher than the oxygen content in an area distanced from the edge center by 50 ?m or more.

Abstract: The present invention relates to a hard film having improved wear resistance and improved toughness. A hard film according to the present invention is formed by using a PVD method on a surface of a base material, wherein: the hard film includes a first hard layer and a second hard layer; the first hard layer has a thickness of approximately 0.1-3.0 ?m and is composed of Ti1-aAlaN (0.3?a?0.7), and has a single phase structure; and the second hard layer has a thickness of approximately 0.5-10 ?m and is composed of Ti1-a-bAlaMebN (0.3?a?0.7, 0?b?0.05, the Me being at least one selected from V, Zr, Si, Nb, Cr, Mo, Hf, Ta and W); according to an XRD phase analysis method, a ratio ([200]/[111]) of the intensity of a [200] peak to the intensity of a [111] peak is approximately 1.5 or higher; the second hard layer preferentially grows in a [200] direction; the [200] peak is located at approximately 42.7°-44.6° and is composed of three phases, and the [111] peak is located at approximately 37.0°-38.

Abstract: A hard coating for cutting tools according to the present invention is a hard coating for cutting tools which is formed on and adjacent to a hard base material by a PVD method, and is characterized in that the thickness of the entire hard coating is 0.5 to 10 ?m, and the hard coating includes one or more nitride layers and one or more oxide layers. Each of the one or more nitride layers has a thickness of 0.1 to 5.0 ?m and is composed of AlaTibMecN (wherein Me is at least one selected from Si, W, Nb, Mo, Ta, Hf, Zr, and Y, and 0.55?a?0.7, 0.2<b?0.45, and 0?c<0.1) or AlaCrbMecN (wherein Me is at least one selected from Si, W, Nb, Mo, Ta, Hf, Zr, and Y, and 0.55?a?0.7, 0.2<b?0.45, and 0?c<0.1) in a cubic phase, and each of the one or more oxide layers has a thickness of 0.1 to 3.0 ?m and is composed of ?-Al2O3 in a cubic phase.

Abstract: The present invention relates to a hard film having improved wear resistance and improved toughness. A hard film according to the present invention is formed by using a PVD method on a surface of a base material, wherein: the hard film includes a first hard layer and a second hard layer; the first hard layer has a thickness of approximately 0.1-3.0 ?m and is composed of Ti1-aAlaN (0.3?a?0.7), and has a single phase structure; and the second hard layer has a thickness of approximately 0.5-10 ?m and is composed of Ti1-a-bAlaMebN (0.3?a?0.7, 0?b?0.05, the Me being at least one selected from V, Zr, Si, Nb, Cr, Mo, Hf, Ta and W); according to an XRD phase analysis method, a ratio ([200]/[111]) of the intensity of a [200] peak to the intensity of a [111] peak is approximately 1.5 or higher; the second hard layer preferentially grows in a [200] direction; the [200] peak is located at approximately 42.7°-44.6° and is composed of three phases, and the [111] peak is located at approximately 37.0°-38.