Patent ID: 8945707
Filing Date: 2015-02-03
Classification: B23B,C23C,Y10T

Abstract:
1. A surface-coated cutting tool comprising a base material and a coating formed on the base material, said base material having a hard phase and a binder phase binding the hard phases to each other, said coating being formed of a single layer or a plurality of layers, La being less than 0.2 mm and Lb being less than 0.1 mm, where point a is a position located away from an edge ridgeline toward a rake face by a distance of said La and point b is a position located away from the edge ridgeline toward a flank face by a distance of said Lb in a cross section of said surface-coated cutting tool cut along a plane including a normal to a surface of said coating at a center of the rake face and a geometric edge where two flank faces intersect; and a region of 10 μm in a surface of said base material from point a′ to point b′ has two to seven cracks with a width of not more than 200 nm, or two to ten pores are present per length of 10 μm in the surface of said base material from said point a′ to said point b′, where said point a′ is a point on the surface of said base material that is located perpendicularly from said point a and said point b′ is a point on the surface of said base material that is located perpendicularly from said point b, and said pore being a cavity with a diameter gradually decreasing toward an interface between said base material and said coating, and said pore having a diameter in said interface of 0.08 to 3 μm.