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Hard alloy part with diamond coating and preparation method of hard alloy part

A technology of diamond coating and hard alloy, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the difficult physical property matching degree and coating thermal stress relief, and cannot prevent cobalt For problems such as diamond graphitization and affecting the bonding force between the film and the substrate, it can achieve excellent film-substrate bonding strength, prevent graphitization, and high adhesion

Active Publication Date: 2017-08-11
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the surface decobalt method can improve the adhesion between the diamond coating and the substrate to a certain extent, the lack of cobalt in the substrate will reduce the toughness of the substrate, and the cobalt that has not been etched inside the substrate will still diffuse to the surface to promote the formation of non-diamond phases. form
In addition, the decobalt method of chemical erosion will cause a large number of deep pits on the surface of the substrate. In the process of subsequent deposition and growth of diamond films, these deep pits cannot be filled, which will lead to microcracks in the subsequent use of tools, affecting Bonding force between film and substrate
The setting of the intermediate layer has not yet reached the adhesion between the diamond film and these intermediate layers required by industrial applications, and it is difficult to take into account the matching degree of physical properties between the substrate, the diamond coating, and the transition layer and the coating. In the case of thermal stress relief, improper control of the interlayer still cannot prevent the graphitization of cobalt on diamond

Method used

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  • Hard alloy part with diamond coating and preparation method of hard alloy part
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] see figure 1 , a kind of preparation method with the cemented carbide part of diamond coating, comprises the following steps:

[0049] (1) Use the YG6X (WC-6wt.% Co) cemented carbide indexing insert sold in the domestic market as the substrate, and perform cleaning and pretreatment to remove the stains on the surface of the substrate: first place the substrate in acetone for ultrasonic cleaning 30min, the ultrasonic power is 100W, and then put the acetone-cleaned substrate into the ethanol solution, ultrasonically clean at 100W for 2min, and dry;

[0050] (2) Put the cleaned matrix into an acetone suspension containing diamond powder (particle size: 300nm), and perform ultrasonication for 60 minutes at a power of 100W to implant diamond crystal seeds on the surface of the matrix, take it out and clean it with alcohol , and finally blow dry with nitrogen to obtain the inoculated matrix;

[0051] (3) Deposit a metal tungsten layer with a thickness of 100nm on the surfac...

Embodiment 2

[0058] A method for preparing a hard alloy part with a diamond coating, comprising the following steps:

[0059] (1) Use the YG8 (WC-8% Co) cemented carbide end mill sold in the domestic market as the substrate, and carry out cleaning pretreatment to remove the stains on the surface of the substrate: first place the substrate in acetone for ultrasonic cleaning for 40 minutes , the ultrasonic power is 110W, and then the acetone-cleaned substrate is put into an ethanol solution, ultrasonically cleaned at 120W for 1min, and dried;

[0060] (2) Put the cleaned matrix into an acetone suspension containing diamond powder (particle size: 300nm), and perform ultrasonication for 45 minutes at a power of 80W to implant diamond crystal seeds on the surface of the matrix, take it out and clean it with alcohol , and finally blow dry with nitrogen to obtain the inoculated matrix;

[0061] (3) Deposit a metal tungsten layer with a thickness of 150nm on the surface of the substrate after the...

Embodiment 3

[0067] A method for preparing a hard alloy part with a diamond coating, comprising the following steps:

[0068] (1) Use the YT15 (WC-15% TiC, Co) cemented carbide blade sold on the domestic market as the substrate to carry out cleaning pretreatment to remove the surface stains of the substrate: first place the substrate in acetone for ultrasonic cleaning for 60 minutes, The ultrasonic power is 90W, and then the acetone-cleaned substrate is put into an ethanol solution, ultrasonically cleaned at 100W for 5min, and dried;

[0069] (2) Put the cleaned matrix into an acetone suspension containing diamond powder (particle size: 500nm), and perform ultrasonication for 30 minutes at a power of 110W to implant diamond crystal seeds on the surface of the matrix, take it out and clean it with alcohol , and finally blow dry with nitrogen to obtain the inoculated matrix;

[0070] (3) Deposit a metal tungsten layer with a thickness of 200nm on the surface of the substrate after the diamo...

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Abstract

The invention provides a preparation method of a hard alloy part with a diamond coating. The preparation method comprises the steps that a hard alloy matrix is obtained, cleaned and pretreated, and then is placed into diamond powder suspension liquid, and diamond seed crystals are implanted into the matrix; an initial tungsten layer is deposited on the surface of the matrix where the diamond seed crystals are implanted, and the initial tungsten layer partially covers the implanted diamond seed crystals; the matrix with the tungsten layer is annealed in the reducing atmosphere; the diamond coating is deposited on the annealed tungsten layer, and the hard alloy part with the diamond coating is obtained. By means of the method, the graphitization effect produced by cobalt when a diamond film layer is deposited can be eliminated, the diamond coating and the matrix have high adhesive force under the combined effect of a Co-W-C transition layer and the tungsten layer which are formed through annealing, and the film-matrix combination strength is high. The invention further provides the prepared hard alloy part with the diamond coating.

Description

technical field [0001] The invention relates to the technical field of preparation of a diamond coating, in particular to a hard alloy part with a diamond coating and a preparation method thereof. Background technique [0002] Cemented carbide is made into tool material because of its ultra-high hardness, and is widely used in processing industries such as mechanical devices. In order to prolong the service life of the cemented carbide tool, a layer of diamond coating is usually covered on its surface to prolong the service life of the tool and improve the processing efficiency and processing accuracy. [0003] However, the adhesion between the diamond coating and the cemented carbide substrate is not high, and it is difficult to deposit a diamond film with good adhesion on the cemented carbide substrate, which greatly hinders the application of the tool. The main reasons for the insufficient adhesion of the diamond film on the cutting tool are: (1) the bonding metal cobalt...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C16/27C23C14/02C23C14/16C23C14/58C23C14/35
CPCC23C14/024C23C14/165C23C14/35C23C14/5806C23C16/271C23C28/322C23C28/324C23C28/34
Inventor 唐永炳谷继腾杨扬
Owner SHENZHEN INST OF ADVANCED TECH
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