A coated tool includes a base and a coating layer located on the base. The coating layer includes a first layer having a thickness of 1 m or more located near the base, and a second layer located more away from the base than the first layer. An erosion rate A2 in the second layer is 0.4 m/g or less which is obtained from a measurement by collision of a liquid A, in which 3 mass % of spherical Al.sub.2O.sub.3 particles having a mean particle diameter of 1.1-1.3 m is dispersed in pure water, against the second layer. An erosion rate A1 in the first layer is 1.8 m/g or less which is obtained from a measurement by collision of the liquid A against the first layer. A cutting tool includes a holder which includes a pocket, and the coated tool located in the pocket.

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer contains a plurality of -Al.sub.2O.sub.3 crystal grains and a plurality of -Al.sub.2O.sub.3 crystal grains, and has a TC(006) of more than 5 in a texture coefficient TC(hkl). A ratio of C.sub. to a sum of C.sub. and C.sub.: [C.sub./(C.sub.+C.sub.)100](%) is 0.05 to 7%, where C.sub. is a total number of peak counts of the -Al.sub.2O.sub.3 crystal grains obtained from measurement data of x-ray diffraction for the coating, and C.sub. is a total number of peak counts of the -Al.sub.2O.sub.3 crystal grains obtained from the measurement data of the x-ray diffraction for the coating.

A surface-coated cutting tool according to the present invention includes a coating. The coating has an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer includes a lower layer portion and an upper layer portion. When respective crystal orientations of crystal grains of -Al.sub.2O.sub.3 are specified by performing EBSD analyses with an FE-SEM on a cross-section obtained when the -Al.sub.2O.sub.3 layer is cut along a plane including a normal line of a surface of the -Al.sub.2O.sub.3 layer and a color map is prepared based on the crystal orientations, in the color map, an area in the upper layer portion occupied by the crystal grains of which normal direction of a (001) plane is within 10 with respect to a normal direction of the surface of the -Al.sub.2O.sub.3 layer is equal to or more than 90%, and such an area in the lower layer portion is equal to or less than 50%.

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer contains -Al.sub.2O.sub.3 crystal grains and sulfur, and has a TC(006) of more than 5 in texture coefficient TC(hkl). The sulfur has a concentration distribution in which a concentration of the sulfur decreases in a direction away from a base-material-side surface of the -Al.sub.2O.sub.3 layer, in a thickness direction of the -Al.sub.2O.sub.3 layer.

A surface-coated cutting tool according to the present invention includes a coating. The coating has an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer includes a lower layer portion and an upper layer portion. When respective crystal orientations of crystal grains of -Al.sub.2O.sub.3 are specified by performing EBSD analyses with an FE-SEM on a cross-section obtained when the -Al.sub.2O.sub.3 layer is cut along a plane including a normal line of a surface of the -Al.sub.2O.sub.3 layer and a color map is prepared based on the crystal orientations, in the color map, an area in the upper layer portion occupied by the crystal grains of which normal direction of a (001) plane is within 10 with respect to a normal direction of the surface of the -Al.sub.2O.sub.3 layer is equal to or more than 90%, and such an area in the lower layer portion is equal to or less than 50%.

A composite part includes: a cutting edge part made of cubic boron nitride sintered material or WC-based cemented carbide; a cutting tool body made of cemented carbide; and a bonding part between the cutting edge part and the cutting tool body. A primarily TiC layer containing 50 area % or more of TiC is formed in an interface between the cemented carbide and the bonding part, and has a thickness of 0.5-3 m. TiNi enriched layer containing each of Ti and Ni at 30 atomic % or more is formed adjacent to the primarily TiC layer and has a thickness of 0.3-3 m. An intermittent net structure containing each of Ti, Ni and C at 10 atomic % or more is formed adjacent to the primarily TiC layer. A straight line overlapping with a major axis of each of crystal grains intersects 3 or more other crystal grains.

A surface-coated cutting tool of the invention is a surface-coated cutting tool in which a surface of a tool body is coated with a lower layer and an upper layer, in which at least one layer of the lower layer is made of a TiCN layer, the upper layer has an average layer thickness of 2 to 15 m and is made of an Al.sub.2O.sub.3 layer having an -type crystal structure in a chemically deposited state, and in a coincidence grain boundary distribution graph, a highest peak is present in 3 in the range of 3 to 29, a distribution ratio of 3 occupies 35 to 70% of the whole coincidence grain boundary length of 3 or more, and a coincidence grain boundary of 31 or more occupies 25 to 60% of the whole coincidence grain boundary length of 3 or more.

A coated tool according to the present disclosure includes a base body made of WC-based cemented carbide containing WC particles as a hard phase component and Co as a main component of a binding phase, a coating layer located on the base body, and an intermediate layer located between the base body and the coating layer. The intermediate layer contains Ti, and has an average layer thickness of 1 nm or more and 15 nm or less. The coating layer includes a first coating layer in contact with the intermediate layer. The first coating layer includes at least one element selected from the group consisting of Al, Group 5 elements, Group 6 elements, and Group 4 elements except for Ti, at least one element selected from the group consisting of C and N, Si, and Cr.

A surface-coated titanium carbonitride-based cermet cutting tool is a surface-coated TiCN-based cermet cutting tool in which a Ti compound layer that is a hard coating layer is deposited as a first layer on the surface of a TiCN-based cermet body containing W and Mo, and a Mo-enriched layer having an average thickness of 0.5 to 10 nm is formed at an interface between a TiCN phase of the body and the hard coating layer.

A method of producing a coated tool part of a cutting tool. The tool part is coated with a coating containing at least one aluminum oxide (Al.sub.2O.sub.3) containing Al.sub.2O.sub.3-layer having an alpha-Al.sub.2O.sub.3 phase fraction and a gamma-Al.sub.2O.sub.3 phase fraction. The at least one Al.sub.2O.sub.3-layer is produced using a reactive magnetron sputtering process.