Abstract: In a surface-coated cutting tool, a hard coating includes one or more layers. At least one layer thereof is a hard coating layer composed of a complex nitride or carbonitride layer of Al, Cr, and Si and satisfying (Al1-x-yCrxSiy)(CzN1-z) where x, y and z are atomic ratios and satisfy 0.1?x?0.4, 0.01?y?0.2, and 0?z?0.3, respectively. The hard coating layer contains particles including: less than 10 atomic % of non-metal components selected from C and N; and metal components selected from Cr, Al and Si. In the cross-section perpendicular to the tool body surface, the number ratio of oblate particles with an Al content of 50 atomic % or less, a long diameter of less than 0.5 ?m, and an aspect ratio of 2.0 or more is 90% or more with respect to the total number of the particles.

Abstract: This surface-coated cutting tool includes a cutting tool body made of tungsten carbide-based cemented carbide and a hard coating layer deposited on a surface of the cutting tool body, in which the hard coating layer has at least one (Ti1-xAlx)N layer (0.4?X?0.7, X is an atomic ratio) with an average layer thickness of 0.5 to 10 ?m, the (Ti, Al)N layer has a cubic crystal structure, and Ia?Ib<5 is satisfied when Ia (%) is an average absorptance of the hard coating layer at a wavelength of 400 to 500 nm and Ib (%) is an average absorptance of the hard coating layer at a wavelength of 600 to 700 nm.

Abstract: In a surface-coated cutting tool, a hard coating includes one or more layers. At least one layer thereof is a hard coating layer composed of a complex nitride or carbonitride layer of Al, Cr, and Si and satisfying (Al1-x-yCrxSiy)(CzN1-z) where x, y and z are atomic ratios and satisfy 0.1?x?0.4, 0.01?y?0.2, and 0?z?0.3, respectively. The hard coating layer contains particles including: less than 10 atomic % of non-metal components selected from C and N; and metal components selected from Cr, Al and Si. In the cross-section perpendicular to the tool body surface, the number ratio of oblate particles with an Al content of 50 atomic % or less, a long diameter of less than 0.5 ?m, and an aspect ratio of 2.0 or more is 90% or more with respect to the total number of the particles.

Abstract: This surface-coated cutting tool includes a cutting tool body made of tungsten carbide-based cemented carbide and a hard coating layer deposited on a surface of the cutting tool body, in which the hard coating layer has at least one (Ti1-xAlx)N layer (0.4?X?0.7, X is an atomic ratio) with an average layer thickness of 0.5 to 10 ?m, the (Ti, Al)N layer has a cubic crystal structure, and Ia?Ib<5 is satisfied when Ia (%) is an average absorptance of the hard coating layer at a wavelength of 400 to 500 nm and Ib (%) is an average absorptance of the hard coating layer at a wavelength of 600 to 700 nm.

Abstract: A surface-coated cutting tool with a body and hard coating layer is provided. (a) The hard coating layer is made of a complex nitride layer of Al and Cr. (b) The hard coating layer deposited on a region from a cutting edge to a location 100 ?m from the cutting edge toward an opposite side thereof has a granular crystal structure. The average grain size of granular crystals on a surface of the hard coating layer on the region is 0.2-0.5 ?m. The average grain size of granular crystals at an interface between the cutting tool body and the hard coating layer on the region is smaller than the average grain size on the surface the hard coating layer in an extent of 0.02-0.1 ?m. The crystal grain size length ratio of crystal grains whose size is 0.15-20% or less.

Abstract: A surface-coated cutting tool having excellent fracture resistance and wear resistance is provided. In the surface-coated cutting tool having at least a hard coating layer made of an (Al, Cr)N layer with a layer thickness of 0.5 ?m to 10 ?m formed to coat on the surface of a cutting tool body made of a WC cemented carbide, pores and droplets are dispersed and distributed in the (Al, Cr)N layer, the occupied area ratio of the pores and the occupied area ratio of the droplets in a cross-section of the (Al, Cr)N layer are 0.5 to 1 area % and 2 to 4 area % respectively, and, furthermore, out of the droplets, Al-rich droplets having a higher Al content ratio than the average Al content ratio of the (Al, Cr)N layer occupy 20 area % or more of the total droplet area.

Abstract: A surface-coated cutting tool with a body and hard coating layer is provided. (a) The hard coating layer is made of a complex nitride layer of Al and Cr. (b) The hard coating layer deposited on a region from a cutting edge to a location 100 ?m from the cutting edge toward an opposite side thereof has a granular crystal structure. The average grain size of granular crystals on a surface of the hard coating layer on the region is 0.2-0.5 ?m. The average grain size of granular crystals at an interface between the cutting tool body and the hard coating layer on the region is smaller than the average grain size on the surface the hard coating layer in an extent of 0.02-0.1 ?m. The crystal grain size length ratio of crystal grains whose size is 0.15-20% or less.

Abstract: A surface-coated cutting tool having excellent fracture resistance and wear resistance is provided. In the surface-coated cutting tool having at least a hard coating layer made of an (Al, Cr)N layer with a layer thickness of 0.5 ?m to 10 ?m formed to coat on the surface of a cutting tool body made of a WC cemented carbide, pores and droplets are dispersed and distributed in the (Al, Cr)N layer, the occupied area ratio of the pores and the occupied area ratio of the droplets in a cross-section of the (Al, Cr)N layer are 0.5 to 1 area % and 2 to 4 area % respectively, and, furthermore, out of the droplets, Al-rich droplets having a higher Al content ratio than the average Al content ratio of the (Al, Cr)N layer occupy 20 area % or more of the total droplet area.