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Method of improving adhesive force of diamond coating on surface of hard alloy cutter

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 problem of reducing the cutting performance and service life of the tool, reducing the hardness and bending strength of the tool matrix, Affect the bonding strength of the coating and the tool, etc., to achieve the effect of smooth surface and increased bonding force

Inactive Publication Date: 2015-01-21
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical method can effectively remove the cobalt content on the surface of the tool and improve the bonding strength, there are certain limitations: (1) This method can only remove cobalt with a very shallow depth of the surface. If it is treated for a long time, it will easily form a structural structure The loose WC (tungsten carbide) layer forms a weak point between the coating and the tool bonding surface, which affects the bonding strength of the coating and the tool, and at the same time reduces the hardness and bending strength of the tool matrix; (2) Corrosion After the cobalt accumulation area is transformed into a huge deep pit, at the same time, it cannot overcome the migration and diffusion of cobalt in the high-temperature aging and cobalt-poor layer.
Therefore, this method will reduce the bonding strength of the diamond coating, reducing the cutting performance and service life of the tool.

Method used

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  • Method of improving adhesive force of diamond coating on surface of hard alloy cutter
  • Method of improving adhesive force of diamond coating on surface of hard alloy cutter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Specific process operations for electrochemical two-step pretreatment and diamond coating:

[0026] 1. Put the surface of the cemented carbide tool into deionized water to clean the surface with ultrasonic waves to remove impurities and oil, and dry it.

[0027] 2. Put the cleaned tool into the electrochemical device to corrode the surface of the body. The electrolyte is 10% NaOH solution, the electrochemical type is DC, the current is 1A, and the electrochemical corrosion time is 15 minutes.

[0028] 3. Then etch with aqua regia solution for 15 minutes, then take out the knife, clean the knife with acetone, and dry it.

[0029] 4. Use ion implantation technology to implant molybdenum ions into the surface of the tool, the implantation energy range is 55kev, and the dose range is 9×1016ions / cm2, so that a layer of compound is formed on the surface, and then mixed with a small amount of diamond micropowder, in an ultrasonic cleaner Shake in medium for 15min.

[0030] 5...

Embodiment 2

[0032] 1. Put the surface of the cemented carbide tool into deionized water to clean the surface with ultrasonic waves to remove impurities and oil, and dry it.

[0033] 2. Put the cleaned tool into the electrochemical device to corrode the surface of the body. The electrolyte is 10% NaOH solution, the electrochemical type is DC, the current is 1A, and the electrochemical corrosion time is 5 minutes.

[0034] 3. Then etched with aqua regia solution for 5 minutes, then took out the tool, cleaned it with acetone, and dried it.

[0035] 4. Use ion implantation technology to implant molybdenum ions into the surface of the tool, the implantation energy range is 60kev, and the dose range is 1.2×10 17 ions / cm 2 , so that it forms a layer of compound CoMoO on the surface 4 , and then oscillate with 15~30g / L diamond micropowder mixture in an ultrasonic cleaner for 15 minutes.

[0036] 5. Deposit a layer of 1~5μm diamond film on the surface of the tool by chemical vapor deposition, a...

Embodiment 3

[0038] 1. Put the surface of the cemented carbide tool into deionized water to clean the surface with ultrasonic waves to remove impurities and oil, and dry it.

[0039] 2. Put the cleaned tool into the electrochemical device to corrode the surface of the body. The electrolyte is 10% NaOH solution, the electrochemical type is DC, the current is 1A, and the electrochemical corrosion time is 10 minutes.

[0040] 3. Then etch with aqua regia solution for 20 minutes, then take out the tool, clean the tool with acetone, and dry it.

[0041] 4. Use ion implantation technology to implant molybdenum ions into the surface of the tool, the implantation energy range is 65kev, and the dose range is 1.5×10 17 ions / cm 2 , so that it forms a layer of compound on the surface, and then mix it with a small amount of diamond micropowder, and vibrate in an ultrasonic cleaner for 15 minutes.

[0042] 5. Deposit a layer of 1~5μm diamond film on the surface of the tool by chemical vapor deposition...

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Abstract

The invention belongs to the field of material coatings and provides a new method of improving adhesive force of a diamond coating on the surface of a hard alloy cutter. The new method specifically comprises the following steps: firstly, pre-treating the cutter by virtue of an electrochemical two-step method so as to effectively remove cobalt from the surface of the cutter, improve the roughness of the surface of the cutter and improve the nucleation density of diamond; then, injecting molybdenum ions to the surface of the cutter so as to form a compound protective layer on the surface of the cutter, wherein the compound protective layer is capable of effectively preventing diffusion of cobalt inside the cutter; and depositing a diamond coating by virtue of a chemical vapor phase deposition method, then performing ion bombardment on the coating so as to effectively lower the roughness of a diamond film and strengthen the binding force of the diamond film, thereby ensuring higher adhesive strength between the diamond coating and a matrix and further greatly improving the cutting performances of the cutter and the service life of the cutter.

Description

technical field [0001] The invention belongs to the field of material coatings, in particular to a method for improving the adhesion of diamond coatings on the surface of cemented carbide tools. Background technique [0002] Cemented carbide tools have a series of excellent characteristics such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc., and are widely used as cutting tool materials. However, with the development of industry and technology, more and more difficult A large number of processed materials have emerged, and a single cemented carbide material has been unable to meet industrial needs. Therefore, coated carbide tools have been produced, of which diamond coating is the most widely used. However, the adhesion of the diamond coating on the cemented carbide tool substrate is poor, and it is easy to fall off from the substrate, seriously affecting the cutting performance and service life of the diamond ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C14/48C23C16/27C23C14/02
CPCC23C28/046C23C14/02C23C14/48C23C16/27
Inventor 陈希章于杰
Owner JIANGSU UNIV
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