A cutting tool includes a substrate; and a coating film, wherein the coating film includes a multilayer structure layer having first unit layer(s) and second unit layer(s), the first unit layer(s) and the second unit layer(s) are alternately layered, under a condition X-ray diffraction intensities of different planes in the multilayer structure layer are respectively represented by I.sub.(200), I.sub.(111), and I.sub.(220), the following formula 0.6≤I.sub.(200)/{I.sub.(200)+I.sub.(111)+I.sub.(220)}, the first unit layer(s) has a NaCl-like structure in which an interplanar spacing d.sub.1c in a c-axis direction is larger than an interplanar spacing d.sub.1a in an a-axis direction, the second unit layer(s) has a NaCl-like structure in which an interplanar spacing d.sub.2c in the c-axis direction is smaller than an interplanar spacing d.sub.2a in the a-axis direction, and the following formulas are satisfied as well 1≤d.sub.1a/d.sub.2a≤1.02, 1.01≤d.sub.1c/d.sub.2c≤1.05, and d.sub.1a/d.sub.2a<d.sub.1c/d.sub.2c.

An object of the invention is to provide a coated cutting tool whose tool life can be extended by having excellent wear resistance and fracture resistance. The coated cutting tool includes: a substrate; and a coating layer formed on a surface of the substrate, in which the coating layer includes a lower layer, an intermediate layer, and an upper layer in this order from a substrate side to a surface side of the coating layer, the lower layer includes one or more Ti compound layers formed of a specific Ti compound, the intermediate layer contains TiCNO, TiCO, or TiAlCNO, the upper layer contains α-type Al.sub.2O.sub.3, an average thickness of the lower layer is 2.0 μm or more and 8.0 μm or less, an average thickness of the intermediate layer is 0.5 μm or more and 2.0 μm or less and is 10% or more and 20% or less of an average thickness of the entire coating layer, an average thickness of the upper layer is 0.8 μm or more and 6.0 μm or less, and in the intermediate layer, a ratio of a length of CSL grain boundaries and a ratio of a length of Σ3 grain boundaries are in specific ranges.

A cutting tool includes a substrate and a diamond layer that covers the substrate. The diamond layer includes a rake face and a flank continuous to the rake face. A ridgeline between the rake face and the flank forms a cutting edge. The substrate includes a top surface opposed to the rake face. When viewed in a direction perpendicular to the top surface, the rake face includes a plurality of protrusions. In a cross-section perpendicular to a direction of extension of the cutting edge, each of the plurality of protrusions includes an inclined portion and a curvature portion continuous to the inclined portion. In the cross-section, a height of the inclined portion in the direction perpendicular to the top surface increases as a distance from the cutting edge increases.

A cutting element, which is configured for the machining of a non-metallic composite material composed of a matrix and particles held together by the matrix, has a flank face, a rake face and a cutting edge which is coated with an edge coating and via which the flank face and the rake face are connected to one another, with which the non-metallic composite material can be machined in an improved fashion. The cutting edge within a cutting edge section thereof is curved in such a way that the cutting edge immediately beneath the edge coating in a section in a section plane that is perpendicular to the cutting edge has, at every point of the cutting edge section, a local radius of curvature which is greater than or equal to 10 μm and less than or equal to 80 μm.

A coated tool in a non-limiting embodiment of the present disclosure includes a base and a coating layer located on the base. The coated tool includes a first surface, a second surface adjacent to the first surface, and a cutting edge located on at least a part of a ridge part of the first surface and the second surface. The coating layer includes a Ti-based coating layer. If a fracture toughness value of the Ti-based coating layer is measured on a surface of the coating layer parallel to a surface of the base, the Ti-based coating layer includes a first region where the fracture toughness value is 10 MPa.Math.m.sup.0.5 or more.

A cutting tool includes a substrate and a coating film, wherein the coating film has a first layer formed from a plurality of hard grains, the hard grains are made of TiSiCN having a cubic crystal structure, the hard grains have a lamellar structure in which a layer having a relatively high silicon concentration and a layer having a relatively low silicon concentration are alternately stacked, and a maximum value of percentage of number A.sub.Si of silicon atoms to a sum of the number A.sub.Si of silicon atoms and number A.sub.Ti of titanium atoms in a grain boundary region between the hard grains, {A.sub.Si/(A.sub.Si+A.sub.Ti)}×100, is larger than an average value of percentage of number B.sub.Si of silicon atoms to a sum of the number B.sub.Si of silicon atoms and number B.sub.Ti of titanium atoms in the first layer, {B.sub.Si/(B.sub.Si+B.sub.Ti)}×100.

A coated cutting tool includes a substrate and a coating layer formed on the substrate, wherein the coating layer comprises a compound layer containing a compound having a composition represented by (Al.sub.xCr.sub.yTi.sub.1−x−y)N (in the formula (1), x represents an atomic ratio of an Al element to a total of the Al element, a Cr element and a Ti element and satisfies 0.70≤x≤0.95, and y represents an atomic ratio of a Cr element to a total of an Al element, the Cr element and a Ti element and satisfies 0.04≤y≤0.21, and 1−x−y>0); a ratio (Cr/Ti) of the Cr element and the Ti element in the compound layer is 1.0 or more and 2.5 or less; and an average thickness of the compound layer is 2.0 μm or more and 10.0 μm or less.

A tool such as a wafer handler or wafer chuck can include a surface having at least one protrusion. A diamond coating is formed from diamond grains sized so that 90% of the grains are between 200 and 300 nanometers, with the diamond coating being deposited on the surface at a temperature below 500 degrees Celsius over the at least one protrusion. Dopants can be used to provide electrical conductivity needed for electrostatic wafer chuck.

A coated tool in a non-limiting embodiment of the present disclosure includes a base and a coating layer located on the base. The coated tool includes a first surface, a second surface adjacent to the first surface, and a cutting edge located on at least a part of a ridge part of the first surface and the second surface. The coating layer includes an Al.sub.2O.sub.3 layer. If a fracture toughness value of the Al.sub.2O.sub.3 layer is measured on a surface of the coating layer parallel to a surface of the base, the Al.sub.2O.sub.3 layer includes a first region where the fracture toughness value is 5 MPa.Math.m.sup.0.5 or more.

Provided is a coated cutting tool having improved wear resistance and fracture resistance and a prolonged tool life. The coated cutting tool includes a substrate and a coating layer formed on the substrate. The coating layer includes a first layer containing Ti(C.sub.x1N.sub.1-x1) and a second layer containing (Ti.sub.1-y1Al.sub.y1)N, particles in the first layer have an average particle size of 5 nm or more and less than 100 nm, 1.0≤I(111)/I(200)≤20.0 in the first layer, the first layer has an average thickness of 5 nm or more and 1.0 μm or less, 0.1≤I(111)/I(200)≤1.0 in the second layer, particles in the second layer have an average particle size of more than 100 nm and 300 nm or less, and the second layer has an average thickness of 5 nm or more and 2.0 μm or less.