SURFACE-COATED CUTTING TOOL

• Main Authors: TATSUOKA SHO, YAMAGUCHI KENJI, OSADA AKIRA
• Format: Patent
• Language: English; French; German
• Published: 10.02.2016
• Subjects: BORING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TURNING

The hard coating layer includes at least a Ti and Al complex nitride or carbonitride layer, which is formed by a chemical vapor deposition method and has an average layer thickness of 1 to 20 µm, in a case where a composition of the complex nitride or carbonitride layer is expressed by a composition formula: (Ti 1-x Al x )(C y N 1-y ), a content ratio x and a content ratio y satisfy 0.60‰¤x‰¤0.95 and 0‰¤y‰¤0.005, respectively, provided that each of x and y is in atomic ratio, crystal grains constituting the complex nitride or carbonitride layer includes cubic phase crystal grains; and hexagonal phase crystal grains , an area ratio occupied by the cubic phase crystal grains is 30-80 % in a plane perpendicular to the surface of the cutting tool body, an average grain width W; and an average aspect ratio A of the crystal grains with the cubic grain structure are 0.05-1.0 µm; and 5 or less, respectively, and a periodic content ratio change of Ti and Al in the composition formula: (Ti 1-x Al x )(C y N 1- y) exists in each of the cubic phase crystal grains.