摘要:
There is provided a surface-coated sintered body formed of a sintered body of cubic boron nitride with a sufficiently adhesive surface coating layer thereon. The present surface-coated sintered body includes a sintered body of cubic boron nitride and a surface coating layer formed on a surface thereof, the sintered body of cubic boron nitride including 20-99.5% by volume of cubic boron nitride and a binder, the surface coating layer including an adhesion layer and at least one hard coating layer, the adhesion layer being a metal layer including at least W, and being formed to cover a surface of the sintered body of cubic boron nitride, the hard coating layer being formed to coat the adhesion layer, the adhesion layer being configured of an amorphous state and/or ultrafine particles having an average particle size equal to or smaller than 5 nm.
摘要:
A surface-coated cutting tool according to the present invention includes a base material and a coating film formed on the base material. The coating film includes one or more hard layer and one or more oxygen-rich hard layer. The hard layer is crystalline in its entirety or crystalline with a part thereof being amorphous. The oxygen-rich hard layer and the hard layer are stacked and the oxygen-rich hard layer is amorphous in a region of interface with the hard layer.
摘要:
A cutting tool (1) having excellent chip treatability and adhesion resistance is provided. The cutting tool (1) includes a hard sintered body (4) in at least a cutting edge and has a rake face (2) and a flank face (3). The rake face (2) has a chip breaker (5) in a protruded or uneven shape. The hard sintered body contains at least 20% by volume of cubic boron nitride. A region of not more than 20 µm from a surface of the hard sintered body (4) on the rake face side includes A-structures made of cubic boron nitride and B-structures made of at least one selected from the group consisting of hexagonal boron nitride, amorphous boron nitride, and boron oxide. The volume ratio of the B-structures to the sum of the A-structures and B-structures, B/(A+B), is not less than 5% by volume and not more than 90% by volume.
摘要:
A surface-coated sintered body of the present invention includes a sintered body of cubic boron nitride and a surface coating layer formed on a surface thereof, the sintered body of cubic boron nitride containing 20 to 99.5% by volume of cubic boron nitride and a binder, the surface coating layer including an adhesion layer and at least one hard coating layer, the adhesion layer being a metal layer containing at least W and being formed to cover a portion of the surface of the sintered body of cubic boron nitride, the hard coating layer being formed to cover the sintered body of cubic boron nitride and the adhesion layer, a ratio of cubic boron nitride particles in contact with the adhesion layer to a total number of cubic boron nitride particles in contact with the adhesion layer or the hard coating layer in the surface of the sintered body of cubic boron nitride being 0.01 to 20%.
摘要:
A cubic boron nitride sintered body tool (1) of the present invention, in which a cubic boron nitride sintered body (2) is joined to a tool base material (4) via a joining layer (3), has the following feature. The cubic boron nitride sintered body (2) contains cubic boron nitride particles by not less than 30 volume % and not more than 95 volume %, and a binder phase (6) by not less than 5 volume % and not more than 70 volume %. In at least one cross sectional surface of the cubic boron nitride sintered body tool (1) taken along a plane perpendicular to a joining surface having the largest area in joining surfaces between the cubic boron nitride sintered body (2) and the joining layer (3), a point C and a point D are assumed to represent points away by 1/4 of the length of a line segment connecting a point A and a point B shown in a figure. A value obtained when an area of a region surrounded by a line segment connecting the point C and the point D, the first cubic boron nitride particle (7), the second cubic boron nitride particle (8), and the binder phase (6) is divided by the length of the line segment connecting the point A and point B to each other is not less than 0.14 µm and not more than 0.6 µm.