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Method of laser cladding copper-based diamond particle reinforced composite coating on copper alloy surface

A technology of diamond particles and laser cladding, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problem that it is difficult to form an effective interface bond between copper substrate and diamond particles, which is not conducive to the melting and melting of coating and substrate. Problems such as the effective combination of the interface and the loss of the physical properties of diamond in the atomic structure can achieve the effects of inhibiting the degree of graphitization, high thermal conductivity, and protecting integrity

Inactive Publication Date: 2020-07-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The thermal conductivity of the copper substrate is very high, and the reflectivity to the laser is high, which is not conducive to the melting of the coating and the substrate and the effective combination of the interface;
[0006] (2) Diamond is prone to graphitization transformation under the high temperature of laser irradiation, and the atomic structure is destroyed, thus losing the physical properties of diamond. At the same time, in an oxygen environment, the temperature of diamond graphitization will be further reduced;
[0007] (3) Copper is sensitive to oxygen content at high temperature and is easy to form oxides, which makes it difficult to form an effective interfacial bond between the copper matrix and diamond particles

Method used

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  • Method of laser cladding copper-based diamond particle reinforced composite coating on copper alloy surface
  • Method of laser cladding copper-based diamond particle reinforced composite coating on copper alloy surface
  • Method of laser cladding copper-based diamond particle reinforced composite coating on copper alloy surface

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Select diamond particles with an average particle size of 300 mesh, and perform ultrasonic cleaning on the diamond particles in acetone and absolute ethanol environments in sequence. After the end, take them out and wash them with deionized water until neutral. The working pressure is normal pressure, and ultrasonic cleaning The time is 15min, and the cleaning temperature is 20°C;

[0033] (2) Diamond particles, Cr powder and mixed salt NaCl-KCl (mass ratio NaCl:KCl=1:1) are configured as mixed raw materials, the mass ratio of diamond particles: Cr powder: mixed salt is 1:3:5~10, Then heat it to 950°C at a heating rate of 5°C / min in a tube-type resistance furnace with argon gas and keep it for 1h for reaction sintering. At high temperature, the Cr powder in the molten salt reacts with the surface of the diamond to form Cr 7 C 3 / Cr layer. After cooling with the furnace, the product is repeatedly ultrasonically cleaned and sieved to obtain diamond particles coated ...

Embodiment 2

[0041] (1) The diamond particles with an average particle size of 200 mesh are subjected to ultrasonic cleaning in acetone and absolute ethanol environments in turn, and after the end, they are taken out and washed with deionized water until neutral, wherein the working pressure is normal pressure, ultrasonic cleaning The time is 15min, and the cleaning temperature is 20°C;

[0042] (2) Select diamond particles, Cr powder and mixed salt NaCl-KCl (mass ratio NaCl:KCl=1:1) to configure mixed raw materials, the mass ratio of diamond micropowder: Cr powder: mixed salt is 1:4:5~10, Then heat it to 700°C at a heating rate of 10°C / min in a tube-type resistance furnace with argon gas and keep it for 1.5h for reaction sintering. At high temperature, the Cr powder in the molten salt reacts with the surface of the diamond to form Cr 7 C 3 / Cr layer. After cooling with the furnace, the product is repeatedly ultrasonically cleaned and sieved to obtain diamond particles coated with Cr on ...

Embodiment 3

[0050] (1) The diamond micropowder with an average particle size of 100 mesh is subjected to ultrasonic cleaning in acetone and absolute ethanol environments in sequence, and after the end, it is taken out and washed with deionized water to neutrality, wherein the working pressure is normal pressure, and the ultrasonic cleaning time is 15min, the cleaning temperature is 20°C;

[0051] (2) Select diamond particles, Cr powder and mixed salt NaCl-KCl (mass ratio NaCl:KCl=1:1) to configure mixed raw materials, the mass ratio of diamond particles: Cr powder: mixed salt is 1:5:5~10, Then heat it to 800°C at a heating rate of 10°C / min in a tube-type resistance furnace with argon gas and keep it for 1h for reaction sintering. At high temperature, the Cr powder in the molten salt reacts with the surface of the diamond to form Cr 7 C 3 / Cr layer, after cooling with the furnace, the product is repeatedly ultrasonically cleaned and sieved to obtain diamond particles coated with Cr on the...

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Abstract

The invention belongs to the field of metal material surface modification, and discloses a method of preparing a copper-based diamond particle reinforced composite coating using a laser cladding technology on copper and copper alloy surfaces. The method comprises the following steps of sequentially plating metal chromium and silver on the surface of a diamond particle to form a chromium / silver double-coated diamond particle; mixing the chromium / silver double-coated diamond particle and red copper powder to prepare diamond / red copper mixed powder; laying the diamond / red copper mixed powder on acopper alloy substrate, then laying the red copper powder, and carrying out sintering and curing molding; and then using a laser cladding method to melt the pre-placed diamond / red copper mixed powder, and forming the copper-based diamond particle reinforced composite coating after solidification. According to the method of preparing the copper-based diamond particle reinforced composite coating using the laser cladding technology on the copper and copper alloy surfaces provided by the invention, the diamond particles are pretreated by the double plating layer, the structural damage of the diamond particles in machining is effectively avoided, and meanwhile, the bonding problem of the diamond and a copper matrix is solved.

Description

technical field [0001] The invention relates to the field of surface modification of metal materials, in particular to a method for laser cladding a copper-based diamond particle-reinforced composite coating on the surface of a copper alloy. Background technique [0002] Copper and its alloys have excellent electrical and thermal conductivity, and are widely used in electronic packaging and large heat dissipation devices. However, with the upgrading of technology, the service environment of equipment has become more and more harsh. It is required that the heat dissipation device not only has high thermal and electrical conductivity, but also has high wear resistance. For example, the steel continuous casting mold used in the steel production industry is Ultra-high temperature and strong friction in steel continuous casting production; Electromagnetic gun is the next generation of advanced kinetic energy killing weapons, the guide rail material must not only bear the high tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/42C23C18/31B22F9/04B22F7/04C23C24/10B22F1/00
CPCB22F1/0003B22F7/04B22F9/04B22F2007/042B22F2009/043C23C18/1639C23C18/1646C23C18/1675C23C18/31C23C18/42C23C24/103
Inventor 姚成武杨帆黄坚聂璞林
Owner SHANGHAI JIAO TONG UNIV
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