Patent ID: 6077596
Filing Date: 2000-06-20
Classification: C23C,Y10T

Abstract:
A coated hard tool including a hard base material and a hard coating on a surface of said base material, whereinsaid coating includes a total of at least four type A sublayers and type B sublayers stacked alternately starting with a type A sublayer or a type B sublayer at least indirectly on said surface of said base material,said type A sublayer has a thickness in a range of 100 to 5000 nm, and includes a plurality of at least first secondary sublayers and second secondary sublayers successively stacked periodically and repeatedly with each other, wherein said first secondary sublayers respectively have a first composition including at least one compound selected from a nitride, a carbide, a nitrided carbide and an oxide containing at least one element selected from periodic group 4A elements, periodic group 5A elements, Al and B, wherein said second secondary sublayers respectively have a second composition different from said first composition and including at least one compound selected from a nitride, a carbide, a nitrided carbide and an oxide containing at least one element selected from periodic group 4A elements, periodic group 5A elements, Al and B, and wherein each said secondary sublayer has a thickness in a range of 1 to 50 nm,said type B sublayer consists of a single layer containing at least one compound selected from a nitride, a carbide, a nitrided carbide and an oxide containing at least one element selected from periodic group 4A elements, periodic group 5A elements, Al and B, and having a thickness in a range of 100 to 5000 nm.