Surface-coated carbide alloy tool

A cutting tool made of a surface-coated carbide alloy having a hard coating layer which has excellent adhesion, comprising:

• a tungsten carbide-based carbide alloy substrate having an amorphous layer formed by an arc ion plating surface treatment to an average depth of 1 to 50 nm from the surface;
• and
• a single-layered or multi-layered hard coating layer deposited physically on the surface of the tungsten carbide-based carbide alloy substrate, and
• wherein the amorphous layer comprises an amorphous substance formed from the tungsten carbide-based carbide alloy substrate, and
• wherein the single-layered or multi-layered hard coating layer comprises either or both of a composite nitride layer of Ti and Al and a composite carbonitride layer of Ti and Al, which respectively satisfy the composition formula:
• (Ti1-XAlX)N and the composition formula:
• (Ti1-XAlX)C1-YNY, wherein X represents 0.15 to 0.65 and Y represents 0.5 to 0.99 in terms of an atomic ratio, and said single-layered or multi-layered hard coating layer having average thickness of 0.5 to 15 μm.

A cutting tool made of a surface-coated carbide alloy having a wear-resistant coating layer which has excellent adhesion and chipping resistance, comprising:

• a tungsten carbide-based carbide alloy substrate having an amorphous layer formed by an arc ion plating surface treatment to an average depth of 1 to 50 nm from the surface;
• and
• a wear-resistant coating layer deposited physically on the surface of the tungsten carbide-based carbide alloy substrate,
• wherein the amorphous layer comprises an amorphous substance formed from the tungsten carbide-based carbide alloy substrate, and
• wherein said wear-resistant coating layer comprises:
• a primary tough layer which comprises a titanium nitride layer and has an average thickness of 0.1 to 5 μm;
• and
• a single-layered or multi-layered surface hard layer which comprises either or both of a composite nitride layer of Ti and Al and a composite carbonitride layer of Ti and Al, which respectively satisfy the composition formula:
• (Ti1-XAlX)N and the composition formula:
• (Ti1-XAlX)C1-YNY, wherein X represents 0.15 to 0.65 and Y represents 0.5 to 0.99 in terms of an atomic ratio, and said single-layered or multi-layered hard coating layer having an average thickness of 0.5 to 15 μm.

A cutting tool made of a surface-coated carbide alloy having a wear-resistant coating layer which has excellent adhesion, comprising:

• a tungsten carbide-based carbide alloy substrate having an amorphous layer formed by an arc ion plating surface treatment in an average depth of 1 to 50 nm from the surface;
• and
• a wear-resistant coating layer deposited physically and/or chemically on the surface of the tungsten carbide-based carbide alloy substrate,
• wherein the amorphous layer comprises an amorphous substance formed from the tungsten carbide-based carbide alloy substrate, and
• wherein the wear-resistant coating layer comprises:
• a lower coating layer which comprises one layer or a plurality of two or more layers selected from the group consisting of a layer of carbide of Ti, a layer of nitride of Ti, a layer of carbonitride of Ti, a layer of carboxide of Ti a layer of carbonitroxide of Ti, and mixtures thereof;
• and wherein said lower coating layer has an average thickness of 0.5 to 15 μm;
• and
• an upper coating layer which comprises either or both of an aluminum oxide layer and an aluminum oxide-zirconium oxide mixed layer comprising a matrix of aluminum oxide and a zirconium oxide phase dispersed and distributed therein, and wherein said upper coating layer has an average thickness of 0.5 to 15 μm.

A cutting tool made of a surface-coated carbide alloy having a wear-resistant coating layer which has excellent adhesion and chipping resistance, comprising:

• a tungsten carbide-based carbide alloy substrate having an amorphous layer formed by an arc ion plating surface treatment in an average depth of 1 to 50 nm from the surface;
• and
• a wear-resistant coating layer deposited physically and/or chemically on the surface of the tungsten carbide-based carbide alloy substrate,
• wherein the amorphous layer comprises an amorphous substance formed from the tungsten carbide-based carbide alloy substrate, and
• wherein the wear-resistant coating layer comprises:
• a primary tough layer which comprises a titanium nitride layer and has an average thickness of 0.1 to 5 μm;
• a single-layered or multi-layered lower hard layer which comprises either or both of a composite nitride layer of Ti and Al and a composite carbonitride layer of Ti and Al, which respectively satisfy the composition formula:
• (Ti1-XAlX)N and the composition formula:
• (Ti1-XAlX)C1-YNY, wherein X represents 0.15 to 0.65 and Y represents 0.5 to 0.99 in terms of an atomic ratio, and wherein the single-layered or multi-layered lower hard layer has an average thickness of 0.5 to 15 μm;
• and
• a single-layered or multi-layered upper hard layer which comprises either or both of an aluminum oxide layer and an aluminum oxide-zirconium oxide mixed layer made of a matrix of aluminum oxide and a zirconium oxide phase dispersed and distributed therein, and wherein the single-layered or multi-layered upper hard layer has an average thickness of 0.5 to 10 μm.