Method for preparing high-adhesion diamond coating with pulse laser

Abstract

The invention discloses a method for preparing a high-adhesion diamond coating with pulse laser, belonging to the fields of coated cutting tool industry and laser processing. In the method, a dual-laser shock processing (LSP) technology is used to perform selective Co removal treatment on the surface and subsurface of a YG serial hard alloy under the high-frequency and high-pressure action of laser shock waves, by virtue of the great hardness difference between Co and WC on the premise of not affecting the mechanical property of a cutting tool, at the same time, B ions are fed in the cutting tool by adopting laser shock waves with B ions, and the B ions react with Co during high temperature deposition to generate dense CoB and Co2B to prevent Co at the subsurface and core part of the cutting tool from spreading and migrating, thus remarkably improving the bonding strength. According to the method, the dual LSP technology is used to improve the bonding strength of the coated cutting tool and overcome the limitation of traditional measures, thus being an ideal technical means for improving the coating adhesion and the overall mechanical property of the coated cutting tool.

Description

technical field [0001] The invention relates to the field of laser processing and coating tools. Specifically refers to the method of using double laser shock strengthening treatment technology to improve the bonding strength between the diamond coating and the YG series cemented carbide tool, as well as the overall mechanical and mechanical properties of the coating and the tool. Background technique [0002] Diamond has excellent properties such as high hardness, high wear resistance, high thermal conductivity, low coefficient of friction, low coefficient of thermal expansion, etc. It is an ideal tool coating material for wear-resistant coatings of cutting tools. The cemented carbide material has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc., especially its high hardness and wear resistance, and is a widely used tool material. However, with the development of industry and t...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the fact that the current tool pretreatment method cannot leave a certain value of residual compressive stress on the surface of the tool matrix and at a certain depth, and the damage to the matrix is ​​relatively large, such as reducing the hardness and strength of the tool and forming a brittle phase on the edge of the tool. η phase, resulting in brittle fracture, unable to completely remove Co on the surface of the tool, and completely eliminate the limitations of Co migration, diffusion ability, and complicated process of treatment measures. Double laser shock was adopted without damaging the performance of the tool matrix. The enhanced pretreatment technology completely eliminates the influence of Co, and proposes a new and effective pretreatment method to improve the bonding strength and overall performance between the diamond coating and the YG series cemented carbide

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