Coated tool and cutting tool
A coated tool in a non-limiting embodiment of the present disclosure includes a base composed of WC-based cemented carbide including a WC particle and a binding phase, and a diamond film located on the base. In a cross section orthogonal to a surface of the coated tool, the base has a lower content of the binding phase in a surface of the base than a midportion of the base. In an interface region between the base and the diamond film, a WC particle located away from the base is an isolated WC particle, and the number of the isolated WC particle present per interface length of 10 μm is 4 or less. A cutting tool in a non-limiting embodiment of the present disclosure includes the above coated tool.
1 . A coated tool, comprising:
a base composed of WC-based cemented carbide comprising a WC particle and a binding phase; and
a diamond film located on the base, wherein
the base comprises
a first part, and
a second part located closer to a midportion of the base than the first part,
the first part has a content of the binding phase lower than the second part,
in a cross section orthogonal to a surface of the coated tool in an interface region between the base and the diamond film,
a further WC particle located away from the base is an isolated WC particle, and
a number of the isolated WC particle present per interface length of 10 μm is 4 or less, and
a length of the first part from the interface region to the second part is above 2.0 μm and less than or equal to 5.0 μm.
2 . The coated tool according to claim 1 , wherein
the number of the isolated WC particle is 2 or less, and
the content of the binding phase in the first part is 15% or less of the content of the binding phase in the second part.
3 . The coated tool according to claim 1 , wherein
a ratio of a mean particle diameter of WC particles in the first part to a mean particle diameter of WC particles in the second part is less than 0.7.
4 . The coated tool according to claim 1 , wherein
the first part is located at a surface of the base, and
the second part is located at a midportion of the base.
5 . The coated tool according to claim 1 , wherein
the isolated WC particle is located in the diamond film.
6 . A cutting tool, comprising:
a coated tool including
a base composed of WC-based cemented carbide comprising a WC particle and a binding phase; and
a diamond film located on the base, wherein
the base comprises
a first part, and
a second part located closer to a midportion of the base than the first part,
the first part has a content of the binding phase lower than the second part,
in a cross section orthogonal to a surface of the coated tool in an interface region between the base and the diamond film,
a further WC particle located away from the base is an isolated WC particle, and
a number of the isolated WC particle present per interface length of 10 μm is 4 or less, and
a length of the first part from the interface region to the second part is above 2.0 μm and less than or equal to 5.0 μm.