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AssigneeToshiba Tungaloy Co., Ltd.
InventorsHiroyuki Kodama, Nobukazu Yoshikawa, Itsuo Yazaki
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There are disclosed a coated cutting tool which comprises a base material of a hard alloy comprising a hard phase of tungsten carbide and at least one material selected from a carbide, nitride and carbonitride of a metal selected from the Group 4, 5 and 6 of the Periodic Table and a mutual solid solution thereof and a binder phase of at least one element selected from Fe, Ni and Co, and a hard coating film formed on the surface of the base material by a CVD method, wherein the hard coating film has a columnar crystal layer comprising at least one material selected from a carbide, nitride and carbonitride of titanium, the columnar crystal layer contains large-sized particles and small-sized particles, and the ratio of the amounts of the large particles to the small particles is 3 to 50; and a method for producing the same which comprises forming the hard coating film by at least one coating film of a carbide, carbonitride and carbonitroxide of titanium using a hydrocarbon gas containing ethane as a carbon element-feeding gas.
A coated cutting tool which comprises a base material of a hard alloy comprising a hard phase of tungsten carbide and at least one material selected from the group consisting of a carbide, a nitride and a carbonitride of a metal selected from the group consisting of the Group 4, 5 and 6 of the Periodic Table and a mutual solid solution thereof and a binder phase of at least one element selected from the group consisting of Fe, Ni and Co, and a hard coating film formed on the surface of the base material by a chemical vapor deposition method, wherein the hard coating film has a columnar crystal layer comprising at least one material selected from the group consisting of a carbide, a nitride and a carbonitride of titanium, the columnar crystal layer contains particles having crystal particle diameters in a direction horizontal to the interface between the hard coating film and the base material are large and particles having crystal particle diameters in the same direction are small, and the ratio of the average particle diameter of the large particles to the average particle diameter of the small particles is 3 to 50.
A method for producing a coated cutting tool which comprises forming a hard coating film by a chemical vapor deposition method on a surface of a hard metal base material of a hard alloy comprising a hard phase of tungsten carbide and at least one material selected from the group consisting of a carbide, a nitride and a carbonitride of at least one metal selected from the group consisting of the Group 4, 5 and 6 of the Periodic Table and a mutual solid solution thereof and a binder phase of at least one element selected from the group consisting of Fe, Ni and Co, wherein the hard coating film comprises at least one material selected from the group consisting of a carbide, a carbonitride and a carbonitroxide of titanium, and a hydrocarbon gas mainly comprising ethane is used as a carbon element-feeding gas for forming the hard coating film.
Dependencies are inferred from the claim text.