Korloy Inc.

Jin-han Gwon

Seung-Su Ahn

Je-Hun Park

Sun-Yong Ahn

Kyoung-il Kim

Beom-sik Kim

Seong-mo Park

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 μm or more.

Cutting tool with hard coating film formed thereon

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 &#x3bc;m and is composed of TiAlN (0.3&#x2264;a&#x2264;0.7), and has a single phase structure; and the second hard layer has a thickness of approximately 0.5-10 &#x3bc;m and is composed of TiAlMeN (0.3&#x2264;a&#x2264;0.7, 0&#x2264;b&#x2264;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&#xb0;-44.6&#xb0; and is composed of three phases, and the [111] peak is located at approximately 37.0&#xb0;-38.5&#xb0; and is composed of three phases; and when a peak having a largest intensity among the peaks of the three phases is a main peak and remaining peaks are sub-peaks, a ratio (main peak/sub-peaks) of the intensity of the main peak to the intensities of the sub-peaks in a [200] face is approximately 2 or higher, and a ratio (main peak/sub-peaks) of the intensity of the main peak to the intensities of the sub-peaks in a [111] face is approximately 2 or higher.

Hard film having excellent wear resistance and toughness

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Cheongju-si, South Korea

Jin-han Gwon