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Preparation method of composite metal diamond coating

A composite metal and diamond technology, which is applied in the field of diamond processing, can solve the problems of diamond particle separation, diamond shedding, loss, etc., and achieve the effects of improving oxidation resistance, prolonging service life, and reducing costs

Inactive Publication Date: 2018-12-07
WUHU CHANGLING DIAMOND TOOL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high interface energy between diamond and general metals and alloys, diamond particles cannot be infiltrated by general low-melting point alloys, and the adhesion is extremely poor.
In the traditional metal-based sintered diamond tool manufacturing technology, diamond particles are embedded in the metal matrix of the matrix only by the mechanical clamping force generated after the matrix shrinks, without forming a strong chemical bond or metallurgical bond. The interface is not well bonded, so that the diamond particles are easy to separate from the metal base of the matrix during work, and there is a problem of a large amount of diamond falling off, which greatly reduces the life and performance level of diamond tools
The utilization rate of diamonds in most impregnated tools is low, and a large amount of expensive diamonds fall off and are lost in waste during work

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of a diamond coating of a composite metal, comprising the steps of:

[0019] S1, the diamond is boiled for 10 minutes with a concentration of 10wt% sodium hydroxide solution, washed with deionized water to neutrality, then boiled in 15wt% nitric acid solution for 8 minutes, rinsed to neutrality, dried, and set aside;

[0020] S2, putting the diamond obtained in step 1 into the electroless nickel plating solution, stirring constantly, and plating at 50° C. for 20 minutes to obtain a nickel coating;

[0021] S3. Mix the nickel-plated diamond, zinc powder, and copper powder, add steel balls and absolute ethanol, vacuumize for 5 minutes, ball mill at a speed of 100r / min for 20h, and then vacuum at 5Pa and temperature at 1000°C Sintering for 1h, after cooling, sieve to obtain diamond with metal coating on the surface;

[0022] Wherein, in S2, the formula of described nickel plating solution is as follows: 25g / L NiSO 4 ·6H 2 O, 8g / L NiCl 2 ·6H 2 O, 4...

Embodiment 2

[0024] A preparation method of a diamond coating of a composite metal, comprising the steps of:

[0025] S1, the diamond is boiled for 20 minutes with a concentration of 7wt% sodium hydroxide solution, washed with deionized water to neutrality, then boiled in 10wt% nitric acid solution for 15 minutes, rinsed to neutrality, dried, and set aside;

[0026] S2, putting the diamond obtained in step 1 into the electroless nickel plating solution, stirring constantly, and plating at 30° C. for 50 minutes to obtain a nickel coating;

[0027] S3. Mix the nickel-plated diamond, zinc powder, and copper powder, add steel balls and absolute ethanol, vacuumize for 1min, and ball mill for 10h at a speed of 300r / min, and then under the conditions of a vacuum degree of 20Pa and a temperature of 800°C Sintering for 5h, after cooling, sieve to obtain diamond with metal coating on the surface;

[0028] Wherein, in S2, the formula of described nickel plating solution is as follows: 10g / L NiSO 4 ...

Embodiment 3

[0030] A preparation method of a diamond coating of a composite metal, comprising the steps of:

[0031] S1, the diamond is boiled for 12 minutes with a concentration of 9wt% sodium hydroxide solution, washed with deionized water to neutrality, then boiled in 14wt% nitric acid solution for 10 minutes, rinsed to neutrality, dried, and set aside;

[0032] S2, putting the diamond obtained in step 1 into the electroless nickel plating solution, stirring constantly, and plating at 45° C. for 30 minutes to obtain a nickel coating;

[0033] S3. Mix nickel-plated diamond, zinc powder, and copper powder, add steel balls and absolute ethanol, vacuumize for 4 minutes, and ball mill for 18 hours at a speed of 150r / min, and then under the conditions of a vacuum degree of 10Pa and a temperature of 950°C Sintering for 2h, after cooling, sieve to obtain diamond with metal coating on the surface;

[0034] Wherein, in S2, the formula of described nickel plating solution is as follows: 22g / L Ni...

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Abstract

The invention discloses a preparation method of a composite metal diamond coating. The method includes the steps of: S1. boiling diamond with a sodium hydroxide solution, removing grease, performing cleaning with deionized water to neutral, then conducting boiling in a nitric acid solution, activating the surface of diamond powder, performing rinsing to neutral, and conducting drying for standby use; S2. putting the diamond obtained in step 1 into a chemical nickel-plating solution, and conducting stirring continuously for plating, thus obtaining a nickel coating; and S3. mixing the nickel-plated diamond, zinc powder and copper powder, adding steel balls and anhydrous ethanol, performing vacuum pumping and ball milling, then conducting high temperature sintering, cooling and screening, thus obtaining the diamond with a metal coating on the surface. The diamond coating prepared by the method provided by the invention has high interface bonding strength with diamond and prolongs the service life of diamond tools.

Description

technical field [0001] The invention relates to the technical field of diamond processing, in particular to a method for preparing a composite metal diamond coating. Background technique [0002] The high hardness and excellent physical and mechanical properties of diamond make diamond tools an indispensable and effective tool for processing various hard materials. The adhesion of matrix metal matrix to diamond is one of the main factors affecting the service life and performance of diamond tools. Due to the high interface energy between diamond and general metals and alloys, diamond particles cannot be infiltrated by general low-melting point alloys, and the adhesion is extremely poor. In the traditional metal-based sintered diamond tool manufacturing technology, diamond particles are embedded in the metal matrix of the matrix only by the mechanical clamping force generated after the matrix shrinks, without forming a strong chemical bond or metallurgical bond. The interfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/54C25D3/12C22C1/05C22C26/00
CPCC25D5/54C22C1/05C22C26/00C25D3/12
Inventor 胡昌悌
Owner WUHU CHANGLING DIAMOND TOOL CO LTD