Coated cutting tool and preparation method thereof

Abstract

The invention provides a coated cutting tool which comprises a base material and a coated layer. The coated cutting tool is characterized in that the coated layer comprises an inner PVD layer and an outer CVD layer; the CVD layer serves as at least one TiN layer or Ti-B-N layer, or adopts the structure that a plurality of TiN layers and Ti-B-N layers are alternated; the content of B in each Ti-B-N layer is 8-16at%; a bonding layer is formed between the PVD layer and the CVD layer, and made of a metal carbon-nitrogen-oxygen compound; and the structural thickness of each TiN layer or Ti-B-N layer ranges between 0.2-150 nm. The coated cutting tool provided by the invention adopts a coated technology scheme which combines the PVD layer with the CVD layer, so that not only is the toughness good, but also the abrasive resistance is high and the coating adhesion is excellent. Accordingly, the coated cutting tool is relatively long in service life.

Description

technical field [0001] The invention relates to the field of cutting technology, in particular to a coated cutting tool and a preparation method thereof. Background technique [0002] Modern high-productivity chip-forming machining of metals requires reliable tools with high wear resistance, good toughness and excellent resistance to plastic deformation. This can be achieved by using cemented carbide tools coated with wear resistant coatings. The carbide tool is usually in the shape of an indexable insert fastened to a tool holder, but may also be in the form of a solid carbide drill or milling cutter. [0003] Typically, coatings for coating cutting tools are deposited by chemical vapor deposition (CVD) (Chemical Vapor Deposition) or physical vapor deposition (PVD (Physical Vapor Deposition) techniques. In some rare cases, plasma assisted chemical vapor deposition (PACVD) is also used. CVD-coated inserts have high wear resistance and excellent coating adhesion, while PVD...

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Problems solved by technology

Therefore, CVD-coated inserts are preferably used in high-speed turning operations, while PVD-coated inserts are used in cutting operations that require toughness such as milling, profiling and drilling. The coating adhesion of coated cutting tools in the prior art and wear resistance are not very ideal, or the preparation process is complicated, such as the multi-layer coating cutting tool disclosed by the publication number CN102091923B, which provides a hard coating that is more suitable for tough substrates, but the preparation process is relatively cumbersome and the cost High, not conducive to mass production

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