Coated cutting tool and method of making the same

Abstract

The application relates to the field of cutting tools, in particular to a coated tool and a preparation method thereof. The coated tool comprises a cemented carbide substrate, a solid solution layer, a transition layer, an intermetallic compound layer and a diamond coating layer; the cemented carbide substrate comprises a hard phase and a binder phase, the hard phase comprises tungsten carbide, and the binder phase comprises a nickel-cobalt-rhenium-vanadium-aluminum alloy; the transition layer comprises a first transition layer and a second transition layer; the first transition layer is arranged on the surface of the cemented carbide substrate; the second transition layer is arranged on the surface of the first transition layer away from the cemented carbide substrate; the diamond coating layer is arranged on the surface of the second transition layer away from the first transition layer; one of the first transition layer and the second transition layer contains zirconium niobium carbide, and the other contains rhenium. The coated tool has the advantages of significantly improved coating bonding force, excellent thermal shock resistance and greatly prolonged cutting life.

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