Abstract: In the surface-coated cutting tool, a Ti compound layer containing at least nitrogen and carbon is formed on a surface of cutting tool substrate, a nitrogen concentration in the Ti compound layer, in a case of being measured in a direction perpendicular to the surface of the cutting tool substrate in a vicinity of a cutting edge, gradually increases as a distance from cutting tool substrate increases within a range of 0.20 ?m from the surface of the cutting tool substrate toward the Ti compound layer, an average concentration gradient of the nitrogen concentration is 20 at %/?m or more and 300 at %/?m or less, and an average nitrogen concentration in the Ti compound layer in the vicinity of the cutting edge is lower than an average nitrogen concentration in the Ti compound layer at a position of a flank face away from the cutting edge by 3 at % or more.

Abstract: In the surface-coated cutting tool, a Ti compound layer containing at least nitrogen and carbon is formed on a surface of cutting tool substrate, a nitrogen concentration in the Ti compound layer, in a case of being measured in a direction perpendicular to the surface of the cutting tool substrate in a vicinity of a cutting edge, gradually increases as a distance from cutting tool substrate increases within a range of 0.20 ?m from the surface of the cutting tool substrate toward the Ti compound layer, an average concentration gradient of the nitrogen concentration is 20 at %/?m or more and 300 at %/?m or less, and an average nitrogen concentration in the Ti compound layer in the vicinity of the cutting edge is lower than an average nitrogen concentration in the Ti compound layer at a position of a flank face away from the cutting edge by 3 at % or more.

Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes: a substrate and a hard coating layer deposited on the substrate, wherein the hard coating layer has an average thickness of 3 to 25 &mgr;m and includes: (1) at least one layer having an average thickness of 0.1 to 5 &mgr;m and including a granular Ti compound selected from the group including TiC, TiN, TiCN, Ti2O3, TiCO, TiNO, TiCNO and mixtures thereof; (2) a TiCN layer having an average thickness is 2 to 15 &mgr;m and including a longitudinal growth crystal structure; and (3) an Al2O3 layer having an average thickness of 0.5 to 8 &mgr;m; wherein the TiCN layer includes a growth direction and a compositional gradient of carbon and nitrogen along the growth direction.

Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes:

Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes: a substrate and a hard coating layer deposited on the substrate, wherein the hard coating layer has an average thickness of 3 to 25 &mgr;m and includes: (1) at least one layer having an average thickness of 0.1 to 5 &mgr;m and including a granular Ti compound selected from the group including TiC, TiN, TiCN, Ti2O3, TiCO, TiNO, TiCNO and mixtures thereof; (2) a TiCN layer having an average thickness is 2 to 15 &mgr;m and including a longitudinal growth crystal structure; and (3) an Al2O2 layer having an average thickness of 0.5 to 8 &mgr;m; wherein the TiCN layer includes a growth direction and a compositional gradient of carbon and nitrogen along the growth direction.

Abstract: There is disclosed a surface-coated tool member of tungsten carbide based cemented carbide which has a tungsten carbide based cemented carbide substrate and a hard coating formed on the substrate. The hard coating may have one or more layers each of which is made of one material selected from the group consisting of carbide, nitride and oxide of metals in groups IV.sub.A, V.sub.A and VI.sub.A of the Periodic Table; solid solution of said carbide, nitride and oxide; and aluminum oxide. The cobalt content of the substrate in a surface portion at a depth of about 2 .mu.m from a surface thereof is less than that in an interior portion at a depth of about 100 .mu.m from said surface by at least 10%.