Cemented carbide cutting tool for multi-component coating

Abstract

The invention discloses a cemented carbide cutting tool of a multi-component coating, which comprises a matrix and a coating coated on the matrix by a PVD method; wherein, the coating comprises a matrix binding layer coated on the matrix and a composite mixed crystal structural layer which is coated on the matrix binding layer and contains nano crystalline / amorphous composition; the matrix binding layer comprises at least a Ti-based metal layer which comprises at least one of metal elements of Al, Si and groups of IVB, VB and VIB; the composite mixed crystal structural layer comprises elements of Ti1-a-b-cAlaMbSicN, wherein M is one or a plurality of metal elements of Ta, Nb, Zr, Cr, Hf and W. The cemented carbide cutting tool has the advantages of high wearing resistance, high intensity, high temperature resistance, impact resistance, good binding of the coating and matrix, etc.

Description

technical field [0001] The invention relates to a coated hard alloy cutting tool, in particular to a multi-component coating hard alloy cutting tool coated with a physical vapor deposition method (PVD). Background technique [0002] It is well known that using PVD coating method to coat a thin layer of metal oxide, carbide or nitride on the surface of the tool can greatly improve the wear resistance and service life of the tool. TiN, TiCN and TiAlN series coatings are currently The most widely used PVD coatings for commercial cutting tools. With the development of cutting technology and the requirements of processed materials, more stringent requirements are put forward for cutting tool coatings. In recent years, many studies have reported that adding other elements, such as Cr, Zr, V, Mo, Ta, Nb, W, Si, B, Hf, etc., to the above-mentioned traditional coatings, the performance of the coatings will be further improved, especially It is the development of the current multi-l...

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Problems solved by technology

Adding Si element in the coating can improve the hardness and high temperature resistance of the coating at the same time. The above-mentioned published patent documents are basically based on the multilayer film containing Si element deposited alternately, as disclosed in CN1820880A, CN101077645A and US7150925 (Ti, Al, Si) N-based laminated structure coating, but directly depositing (Ti, Al, Si) N or (Ti, Al) (C, N) hard layer on the surface of the substrate has poor adhesion to the substrate ; Traditional nitride or carbonitride transition layer has poor toughness, and the effect is not ideal enough, while pure metal Ti transition layer has good toughness, but it is easy to soften under high temperature, which affects the bonding effect with hard coating; and patent documents CN101048528A and EP1422311A2 introduced AlCrSiN-based coatings, Chinese patent document CN101048528A mentions that metalloid Si or B is added to AlCrN, and the metalloid can form covalently bonded nitrides and produce surrounding (Cr, Al)N microstructures. The single amorphous or semi-crystalline phase of the crystal can further increase the hardness, but because the coating does not contain Ti or contains a low content of Ti, the toughness of the coating is not good, which is unfavorable for the performance of the coated tool

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