A high-temperature-resistant hard composite coating is provided, and includes a CrN transition layer and a nanocomposite layer disposed on the surface of a substrate in sequence. The nanocomposite layer comprises AlCrSiN layers and MeN layers alternately arranged on the surface of the CrN transition layer in sequence. Me comprises W, Nb, or Hf. Also provided are a method for preparing the high-temperature-resistant hard composite coating, and a coated cutter.

A process for producing a hard material layer on a substrate. A multilayer coating system is applied to the substrate by alternate deposition of CrTaN and AlTiN by way of physical vapor deposition (PVD). The CrTaN and/or the AlTiN are preferably deposited from a composite target.

A cutting tool incudes a substrate and a coating that coats a surface of the substrate, the coating including a multilayer structure layer composed of at least one layer A and at least one layer B alternately deposited from a side closer to the substrate toward a side closer to a surface, the layer A having an average composition of Al.sub.xCr.sub.(1-x)N, the layer B being composed of Ti.sub.yAl.sub.zSi.sub.(1-y-z)N, the layer A being composed of a domain region and a matrix region, the domain region having a composition ratio of Cr larger than that of Cr of the matrix region, wherein x has a range of 0.5x0.8, y has a range of 0.5y<0.71, z has a range of 0.29z<0.5, and 1yz has a range of 0<1yz0.1.

A coated cutting tool comprising a substrate comprising a cubic boron nitride sintered body and a coating layer formed on the substrate, wherein the coating layer comprises a Ti carbonitride layer comprising Ti(C.sub.xN.sub.1-x); an average thickness of the Ti carbonitride layer is 0.5 m or more and 5.0 m or less; in the Ti carbonitride layer, R75 is higher than R25; in the Ti carbonitride layer, a texture coefficient TC (111) of a (111) plane is 1.0 or more and 2.0 or less; and in X-ray diffraction measurement of the Ti carbonitride layer, an absolute value of a difference between a maximum value and a minimum value of 2 is 0.1 or less on the (111) plane when the measurement is performed at each of angles of 0, 30, 50 and 70.

Provided is a surface-coated cutting tool including a base material and a coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated. The super-multilayer-structure layer includes an X area and a Y area those are alternately repeated. In the X area, A layers having a thickness A.sub.X and B layers having a thickness B.sub.X are alternately laminated. In the Y area, A layers having a thickness A.sub.Y and B layers having a thickness B.sub.Y are alternately laminated. The thickness A.sub.X is larger than the thickness A.sub.Y, and the thickness B.sub.X is smaller than the thickness B.sub.Y. Each of the A layers and the B layers comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N.

A method for producing a surface-modified component includes: a process of forming a thermal sprayed coating on a substrate; a process of irradiating a surface of the thermal sprayed coating with a high energy beam so as to cause an entirety of the thermal sprayed coating and a part of the substrate in a thickness direction to melt and then solidify, and thereby forming a densified modified layer; a process of forming a thermal sprayed coating on the modified layer which has been formed in the latest; and a process of irradiating a surface of the thermal sprayed coating with a high energy beam so as to cause an entirety of the thermal sprayed coating and a part of the modified layer which has been formed in the latest in the thickness direction to melt and then solidify, and thereby forming a densified modified layer.

A cutting tool includes a substrate and a coating that coats a surface of the substrate, the coating including a multilayer structure layer composed of at least one layer A and at least one layer B alternately deposited from a side closer to the substrate toward a side closer to a surface, the layer A having an average composition of Al.sub.xCr.sub.(1-x)N, the layer B being composed of Al.sub.yTi.sub.(1-y)N, the layer A being composed of a domain region and a matrix region, the domain region having a composition ratio of Cr larger than that of Cr of the matrix region, wherein x has a range of 0.5x0.8 and y has a range of 0.5y0.7.

A cutting tool including a rake face, a flank face, and a cutting edge portion, comprising a substrate and an AlTiN layer, the AlTiN layer including cubic Al.sub.xTi.sub.1-xN crystal grains, Al having an atomic ratio x of 0.7 or more and less than 0.95, the AlTiN layer including a central portion, the central portion at the rake face being occupied in area by (111) oriented Al.sub.xTi.sub.1-xN crystal grains at a ratio of 50% or more and less than 80%, the central portion at the cutting edge portion being occupied in area by (111) oriented Al.sub.xTi.sub.1-xN crystal grains at a ratio of 80% or more.

A component of a turbine, in particular a gas turbine, wherein the component has a coating for increasing the erosion and corrosion resistance, wherein the coating is preferably applied directly to the component, wherein the coating consists of a functional layer and an intermediate layer, wherein the intermediate layer is arranged between the turbine blade substrate and the functional layer and wherein the functional layer consists of the elements Al, Cr, O and N.

A surface-coated cutting tool includes a substrate and a coating film that coats the substrate, wherein the coating film includes a hard coating layer constituted of a domain region and a matrix region, the domain region is a region having a plurality of portions divided and distributed in the matrix region, the domain region has a structure in which a first layer composed of a first Al.sub.x1Ti.sub.(1-x1) compound and a second layer composed of a second Al.sub.x2Ti.sub.(1-x2) compound are layered on each other, the matrix region has a structure in which a third layer composed of a third Al.sub.x3Ti.sub.(1-x3) compound and a fourth layer composed of a fourth Al.sub.x4Ti.sub.(1-x4) compound are layered on each other, the first AlTi compound and the third AlTi compound have a hexagonal crystal structure, the second AlTi compound and the fourth AlTi compound have a cubic crystal structure.