Abstract: Provided is a cutting tool comprising a base body and a hard carbon film arranged on the base body, in which the hard carbon film includes an amorphous phase and a graphite phase, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the degree of orientation of the graphite phase is no more than 6.

Abstract: A cutting tool comprising a base material and a coating disposed on the base material, wherein the coating comprises a first layer, the first layer consists of a MoC1-x layer formed from a compound represented by MoC1-x or a TaC1-y layer formed from a compound represented by TaC1-y, the compound represented by MoC1-x consists of a hexagonal crystal structure, the x is 0.40 or more and 0.60 or less, the compound represented by TaC1-y comprises 95% by mass or more of a hexagonal crystal structure, and the y is 0:40 or more and 0.60 or less.

Abstract: Provided is a cutting tool comprising a base material and a film arranged on the base material, in which the film includes a hard carbon film on the outermost surface thereof, the hard carbon film includes a first region, the first region is a region sandwiched between the surface of the hard carbon film and an imaginary plane P at a distance of 40 nm from the surface to the base material side, and the sp2 component amount C2 and the sp3 component amount C3 in the first region exhibit a relationship of the following formula 1: {C2/(C2+C3)}×100?2.0??formula 1.

Abstract: Provided is a cutting tool that can have a long tool life even when used to cut soft metals in particular. The cutting tool comprises a base body and a hard carbon film arranged on the base body, the hard carbon film includes an amorphous phase and a graphite phase, the density of the hard carbon film is no less than 2.5 g/cm3 and no more than 3.5 g/cm3, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the average coordination number of the amorphous phase is no less than 2.5 and no more than 4.

Abstract: Provided is a cutting tool that can have a long tool life even when used to cut soft metals in particular. The cutting tool comprises a base body and a hard carbon film arranged on the base body, the hard carbon film includes an amorphous phase and a graphite phase, the density of the hard carbon film is no less than 2.5 g/cm3 and no more than 3.5 g/cm3, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the average coordination number of the amorphous phase is no less than 2.5 and no more than 4.

Abstract: Provided is a cutting tool comprising a base body and a hard carbon film arranged on the base body, in which, when the cross section of the hard carbon film is observed using a high angle annular dark field scanning transmission electron microscope, the area proportion of black regions with an equivalent circle diameter of 10 nm or more is 0.7% or less, and the hard carbon film has a hydrogen content of 5 atom% or less.

Abstract: Provided is a cutting tool comprising a base body and a hard carbon film arranged on the base body, in which the hard carbon film includes an amorphous phase and a graphite phase, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the degree of orientation of the graphite phase is no more than 6.

Abstract: A cemented carbide comprises a first hard phase comprising tungsten carbide particles and a binder phase including Co and Cr. In any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, with the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and a ratio C(R)/C(C) has an average value of 0.17 or more, where C(R) and C(C) represent peak values of atomic percentages of Cr and Co, respectively, at a WC/WC interface having a distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles+2 at %.

Abstract: A cemented carbide comprises a first hard phase comprising tungsten carbide particles and a binder phase including Co and Cr. In any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, with the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and a ratio C(R)/C(C) has an average value of 0.17 or more, where C(R) and C(C) represent peak values of atomic percentages of Cr and Co, respectively, at a WC/WC interface having a distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles+2 at %.

Abstract: A cemented carbide comprising a first hard phase composed of tungsten carbide particles and a binder phase including Co, the cemented carbide having a ratio Nt/Na of 0.9 or more, where, in any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and Na represents a total number of WC/WC interfaces and Nt represents a number of WC/WC interfaces having distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles.

Abstract: A cemented carbide comprising a first hard phase composed of tungsten carbide particles and a binder phase including Co, the cemented carbide having a ratio Nt/Na of 0.9 or more, where, in any surface or any cross section of the cemented carbide, a region in which there is a distance X of 5 nm or less between surfaces respectively of tungsten carbide particles adjacent to each other, the surfaces facing each other along a length L of 100 nm or more, is referred to as a WC/WC interface, and Na represents a total number of WC/WC interfaces and Nt represents a number of WC/WC interfaces having distance X of 1 nm or more and 5 nm or less and having therein an atomic percentage of Co higher than an average value of atomic percentages of Co in the tungsten carbide particles.

Abstract: A surface-coated cutting tool of the present invention includes a substrate and a coated layer formed on the substrate, and the coated layer is a physical-vapor-deposition layer having a thickness of 10 ?m or more. A surface region having a thickness of 1 ?m from a surface of the coated layer includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress, and the integrated residual stress of the surface region falls within the range of ?1.5 to 1.5 GPa in any region included in the surface region.

Abstract: A surface-coated cutting tool of the present invention includes a substrate and a coated layer formed on the substrate, and the coated layer is a physical-vapor-deposition layer having a thickness of 10 ?m or more. A surface region having a thickness of 1 ?m from a surface of the coated layer includes a first region whose integrated residual stress is a compressive stress and a second region whose integrated residual stress is a tensile stress, and the integrated residual stress of the surface region falls within the range of ?1.5 to 1.5 GPa in any region included in the surface region.