| 摘要 |
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 (Ti1-xAlx)(CYN1-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, 0.85≦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. |
| 主权项 |
1. A surface coated cutting tool comprising:
a cutting tool body made of any one of tungsten carbide-based cemented carbide, titanium carbonitride-based cermet, and cubic boron nitride-based ultra-high pressure sintered material; and a hard coating layer provided on a surface of the cutting tool body, wherein the hard coating layer comprises at least a Ti and Al complex carbonitride layer formed by a chemical vapor deposition method, the complex carbonitride layer includes an alternate laminated structure made of a region A layer and a region B layer, each of which is represented by a composition formula (Ti1-xAlx)(CyN1-y), the alternate laminated structure having an average total layer thickness of 1-10 μm, in the region A layer, a content ratio x, which is an Al content relative to a total content amount of Ti and Al, satisfies 0.70≦x≦0.80; a content ratio y, which is a C content relative to a total content amount of C and N, satisfies 0.0005≦y≦0.005, each of x and y being atomic ratio; an average grain width W, which is an average value of grain width in a plane parallel to the surface of the cutting tool body, is 0.1 μm or less; and an average grain length L, which is an average value of grain length in a direction perpendicular to the surface of the cutting tool body, is 0.1 μm or less, in the region B layer, a content ratio x, which is an Al content relative to a total content amount of Ti and Al, satisfies 0.85≦x≦0.95; a content ratio y, which is a C content relative to a total content amount of C and N, satisfies 0.0005≦y≦0.005, each of x and y being atomic ratio; an average grain width W, which is an average value of grain width in a plane parallel to the surface of the cutting tool body, is 0.1 μm to 2.0 μm; and an average grain length L, which is an average value of grain length in a direction perpendicular to the surface of the cutting tool body, is 0.5 μm to 5.0 μm, the alternate laminated structure includes at least a pair of the region A layer and the region B layer which are alternately arranged, and a top layer of the alternate laminated structure is the region A layer. |
