Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2006-12-05
2006-12-05
Turner, Archene (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C051S307000, C051S309000, C407S119000, C204S192380, C428S336000, C428S697000, C428S699000
Reexamination Certificate
active
07144639
ABSTRACT:
A surface-coated cutting tool member exhibiting a superior tool life due to a hard coating layer thereof is provided. The surface-coated cutting tool member includes a tungsten carbide based cemented carbide substrate, a titanium carbonitride based cermet substrate, or a cubic boron nitride based sintered substrate; and a hard coating layer of a nitride compound containing titanium and yttrium, which is formed on a surface of the substrate using a physical vapor deposition method in an overall average thickness of 1 to 15 μm. The hard coating layer has a component concentration profile in which maximum Y component containing points (minimum Ti component containing points) and points without Y component (TiN points) appear alternatingly and repeatedly at a predetermined interval in a direction of thickness of the hard coating layer, and the amount of contained Y component is continuously changed from the maximum Y component containing points to the points without Y component and from the points without Y component to the maximum Y component containing points, the maximum Y component containing points satisfy a composition formula of (Ti1-XYX)N (where X indicates an atomic ratio of 0.005 to 0.15), and a distance between one of the maximum Y component containing points and adjacent one of the points without Y component is from 0.01 to 0.1 μm.
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Nakamura Eiji
Takaoka Hidemitsu
Tashiro Yasuhiko
Darby & Darby
Mitsubishi Materials Corporation
Mitsubishi Materials Kobe Tools Corporation
Turner Archene
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