SURFACE-COATED CUTTING TOOL

• Main Authors: TATSUOKA SHO, IWASAKI NAOYUKI, YAMAGUCHI KENJI, OSADA AKIRA
• Format: Patent
• Language: English; French; German
• Published: 13.04.2016
• Subjects: 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; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

A coated tool with a hard coating layer, which has an excellent hardness and heat insulating effect; and exhibits an excellent chipping resistance and an excellent fracturing resistance for a long-term usage, is provided. The hard coating layer included in the coated tool has a chemically vapor deposited alternate laminated structure, which is made of: a region A layer and a region B layer, each of which is expressed by the composition formula of (Ti 1-x Al x )(C y N 1-y ); and has the average total layer thickness of 1-10 µm. In the region A layer, relationships, 0.70‰¤x‰¤0.80 and 0.0005‰¤y‰¤0.005, are satisfied; the average grain width W is 0.1 µm or less; and the average grain length L is 0.1 µm or less. In the region B layer, relationships, 0.8‰¤x‰¤0.95 and 0.0005‰¤y‰¤0.005, are satisfied; the average grain width W is 0.1-2.0 µm; and the average grain length L is 0.5-5.0 µm.