A hard coating includes a three kinds of layers that are alternately laminated. The three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers. The single composition layer is constituted by one of an A composition (nitride of AlCrα), a B composition (nitride of AlTiCrβ) and a C composition (nitride of AlCr(SiC)γ). The two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and B composition, a combination of the A composition and C composition and a combination of the B composition and C composition. The single composition layer has a thickness of 0.5-1000 nm. Each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of 1-1000 nm.

A hard coating includes a three kinds of layers that are alternately laminated. The three kinds of layers consist of a single composition layer and two kinds of nanolayer-alternated layers. The single composition layer is constituted by one of an A composition (nitride of AlCrSiα), a B composition (nitride of AlTiSiβ) and a C composition (nitride of AlCr(SiC)γ). The two kinds of nanolayer-alternated layers include nanolayers which are alternately laminated and which are constituted by two of three combinations consisting of a combination of the A composition and B composition, a combination of the A composition and C composition and a combination of the B composition and C composition. The single composition layer has a thickness of 0.5-1000 nm. Each of the nanolayers constituting the two kinds of nanolayer-alternated layers has a thickness of 0.5-500 nm, and each of the two kinds of nanolayer-alternated layers has a thickness of 1-1000 nm.

A cutting tool includes: a rake face; a flank face continuous to the rake face; and a cutting edge formed by a ridgeline between the rake face and the flank face. The cutting tool includes: a base material having a first face on a side of the rake face and a second face on a side of the flank face; and a diamond layer covering the first face and the second face. The first face includes: a first top face continuous to the second face; and a second top face continuous to the first top face and disposed such that the first top face is sandwiched between the second top face and the second face. An angle formed between the first top face and the second top face is a negative angle in a cross section perpendicular to the cutting edge.

The invention relates to a tool part (1) having a main body (3) and at least one cutting zone (5) formed on the main body (3), wherein the cutting zone (5) has a clearance face (7) and a rake face (9) which adjoin each other at a cutting edge (11), wherein the rake face (9) has a coating (13) applied to a main body material of the main body (3) and extending as far as the cutting edge (11), which coating is harder than the main body material. According to the invention, the clearance face (7) is free of the coating (13) in a clearance zone (15) proceeding from the cutting edge (11).

A cutting tool, comprising a substrate having a cutting surface and a coating adhered to the cutting surface in a solid state, wherein the coating includes a soft metal and is capable of melting and functioning as an in-situ liquid lubricant when the cutting tool is applied in a machining operation. Also, a method of applying a coating to a cutting tool, comprising receiving a premachining workpiece, the premachining workpiece formed of a coating material including a soft metal; and machining the premachining workpiece with the cutting tool such that a layer of the coating material adheres to a cutting surface of the cutting tool in a solid state.

Disclosed are rare earth metal containing silicate coatings, coated articles (e.g., heaters and susceptors) or bodies of articles and methods of coating such articles with a rare earth metal containing silicate coating.

A coated tool in the present disclosure includes a base and a coating layer located on a surface of the base. The coating layer includes an intermediate layer including Ti, and an Al.sub.2O.sub.3 layer. The Al.sub.2O.sub.3 layer is located in contact with the intermediate layer at a position further away from the base than the intermediate layer. The intermediate layer includes a plurality of first protrusions protruding toward the Al.sub.2O.sub.3 layer. At least one of the plurality of first protrusions is a composite protrusion including second protrusions protruding in a direction intersecting with a protruding direction of the first protrusions. A percentage of the composite protrusions in the plurality of first protrusions is 30% or less. A cutting tool in the present disclosure includes a holder which is extended from a first end toward a second end and includes a pocket on a side of the first end, and the coated tool located in the pocket.

The present invention relates to a cutting tool, which performs, like a drill or a ball end mill, cutting while rotating in a state in which the center of the tip end is in contact with a work material, and includes a wear-resistant layer formed at the tip end thereof, wherein a portion of the wear-resistant layer is selectively removed through tip end polishing from the center of the tip end of the drill or the ball end mill to a predetermined area, so as to restrain micro-brittle wear generated in an ultra-low speed region, and thus remarkably improving the cutting lifespan of the cutting tool such as the drill or the ball end mill.

This surface-coated cutting tool is a surface-coated cutting tool having a hard coating layer formed on a surface of a tool body in which the hard coating layer includes at least one orientational Ti compound layer made of a rock salt-type cubic crystal structure containing 35 at % or more of Ti and 30 at % or more of N, a maximum TC value (TC max) is 2.5 or more, and, in the case of measuring crystal orientations, in a plane parallel to the surface of the tool body, of crystal grains for which a plane having the maximum TC value is perpendicular to the surface of the tool body, a full width at half maximum of ϕ scan is 30° or less.

A drill in which: a chip discharge groove is formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body; and a cutting edge is formed in an intersecting edge between a rake surface of a leading end side region and a leading end flank of the edge portion, the drill comprising a margin portion, a shoulder portion and a web thinning portion, wherein: the cutting edge comprises, in order from a rotation center, a first cutting edge portion, a second cutting edge portion, a shoulder cutting edge portion, and a margin cutting edge portion; the honing width gradually decreases from the boundary P1 toward the position P2; and the conditions represented by expression (1): honing width of second cutting edge portion≤R1 and expression (2): 2.0<R1/R2<5.0 are satisfied.