CUTTING TOOL MADE OF SURFACE COATED CEMENTED CARBIDE IN WHICH HARD COATING LAYER HAS EXCELLENT WEAR RESISTANCE

• Main Authors: SUDO TOSHIKATSU, TANAKA TETSUYA, SAKURAI KEIICHI
• Format: Patent
• Language: English
• Published: 09.11.1999
• Edition: 6
• 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

PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cemented carbide in which a hard coating layer has excellent wear resistance. SOLUTION: A coated cemented carbide tool is the one in which the surface of a tungsten carbide base cement carbide substrate is physicalle vapor-deposited with a hard coating layer composed of a singly layer or composite layers consisting of either or both of a (Ti, Al)N layer and a (Ti, Al)CN layer having the compositional formulae for forming arc ion plating: (Ti1-x Alx )N and (Ti1-x Alx )C1-y N1-y where, by atomic ratio, (x) denotes 0.3 to 0.7, and (y) denotes 0.5 to 0.99} by the average layer thickness of 3 to 20 μm. In this case, in X-ray diffraction for the cemented carbide tool using a CuKα ray as a radiation source, the diffraction peak shown in the angle of diffraction (2θ) in the range of 42.5 to 44.5 degrees in the hard coating layer shows the X-ray diffraction pattern of the three continuous peak shapes of the main peak and peaks on both sides thereof connected thereto.