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Superhard composite coated cutting tool and its preparation method

A composite coating, super-hard technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problem of the weak bonding force between the cubic boron nitride coating and the cemented carbide substrate, which affects the cutting of the coating. Problems such as tool quality and service life, thermal expansion coefficient mismatch, etc., to alleviate the sudden change of physical properties of the interface, strong interlayer bonding force, and avoid falling off and chipping.

Active Publication Date: 2019-04-02
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the cubic boron nitride coating has high hardness, high wear resistance and good red hardness, and is chemically inert to iron metal elements, so the cubic boron nitride coating is widely used as a coating material. However, there is a mismatch in hardness, elastic modulus and thermal expansion coefficient between the cubic boron nitride coating and the cemented carbide substrate. During the thermal spraying process, the bonding interface between the cubic boron nitride coating and the substrate will generate residual stress. As a result, the bonding force between the cubic boron nitride coating and the cemented carbide substrate is not strong, and the coating is prone to peeling off during use, which affects the quality and service life of the coated cutting tool

Method used

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  • Superhard composite coated cutting tool and its preparation method

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Effect test

Embodiment 1

[0022] This embodiment provides a superhard composite coating cutter, its structure is as follows figure 1 As shown, it includes a cemented carbide substrate 1 for carrying the superhard composite coating, and a metal transition layer 2 sprayed on the surface of the cemented carbide 1 and a cubic boron nitride coating doped with metallic nickel in sequence. Layer 3.

[0023] Wherein, in the cubic boron nitride coating doped with metallic nickel, the metallic nickel is coated on the surface of the cubic boron nitride crystal, and the total mass of the metallic nickel accounts for all of the surface coated with metallic nickel. 20% of the total mass of the cubic boron nitride crystal. In this embodiment, the metal transition layer 2 is a metal titanium layer, the thickness of the metal titanium layer is 50 microns, and the thickness of the cubic boron nitride coating doped with metal nickel is 400 microns.

[0024] The present embodiment also provides a method for preparing th...

Embodiment 2

[0028] This embodiment provides a superhard composite coated tool, the specific structure of which is the same as that of the superhard composite coated tool in Example 1.

[0029] This embodiment also provides a method for preparing the above-mentioned superhard composite coating tool, and the specific steps are roughly the same as those in Embodiment 1, except that:

[0030] In the step (1) of this embodiment, the metal transition layer coated on the surface of the cemented carbide substrate is a metal chromium layer with a thickness of 45 microns;

[0031] The process parameters of the supersonic flame spraying method in the step (1) of this embodiment are: the fuel pressure is 1.0 MPa, the fuel flow rate is 10 L / h, the oxygen pressure is 0.5 MPa, the oxygen flow rate is 10 L / h, the powder feeding The flow rate is 5 kg / h, the powder feeding gas is nitrogen, and the spraying distance is 200 mm.

Embodiment 3

[0033] This embodiment provides a superhard composite coating tool, the specific structure is as follows figure 2 As shown, it includes a cemented carbide substrate 1 for carrying the superhard composite coating, and a metal Cr layer 201, a metal Nb layer 202 and a metal nickel doped layer coated on the surface of the cemented carbide 1 in sequence. Cubic boron nitride coating3.

[0034] Wherein, in the boron nitride coating doped with metallic nickel, the metallic nickel is coated on the surface of the boron nitride crystal, and the total mass of the metallic nickel accounts for the cubic mass of the surface coated with metallic nickel. 50% of the total mass of boron nitride crystals. Both the metal Cr layer 201 and the metal Nb layer 202 have a thickness of 25 microns, and the thickness of the cubic boron nitride coating 3 doped with metal nickel is 300 microns.

[0035] This embodiment provides a method for preparing a superhard composite coating tool, the specific steps...

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Abstract

The invention provides a superhard composite coated cutting tool. The structure of the superhard composite coated cutting tool comprises a cemented carbide substrate, a metal transition layer and a cubic boron nitride coating doped with metallic nickel, wherein the metal transition layer and the cubic boron nitride coating are sequentially sprayed to the surface of the cemented carbide substrate. The superhard composite coated cutting tool is reasonable in structural design, excellent in wear resistance, high in interlayer bonding force and long in service life. The invention further provides a preparation method of the superhard composite coated cutting tool. The preparation method comprises steps as follows: metal micro-powder and cubic boron nitride composite micro-powder coated with the metallic nickel on the surface are taken as raw materials, and the metal transition layer and the cubic boron nitride coating doped with the metallic nickel are sequentially sprayed to the surface of the cemented carbide substrate with a supersonic flame spraying method. The preparation method adopts a simple process, equipment can operate automatically, and industrialization is facilitated.

Description

technical field [0001] The invention relates to the technical field of coated cutting tools, in particular to a superhard composite coated cutting tool and a preparation method thereof. Background technique [0002] With the development of modern machining industry, higher requirements are put forward for the performance of cutting tools. In the prior art, one or more composite coatings with high hardness and good wear resistance are usually coated on the tool substrate, so that the high strength, high toughness of the substrate and the high hardness and high wear resistance of the coating are phased. Combined, so as to reduce the friction factor between the cutting tool and the workpiece, and improve the wear resistance of the cutting tool. Among them, the cubic boron nitride coating has high hardness, high wear resistance and good red hardness, and is chemically inert to iron metal elements, so the cubic boron nitride coating is widely used as a coating material. However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06
CPCC23C4/06
Inventor 雷君陈培
Owner FUNIK ULTRAHARD MATERIAL
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