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A kind of preparation method of Cu-based SIC composite micropowder for electric discharge tool electrode

A tool electrode and electric spark technology, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems of uneven distribution, affecting the performance of electrodes, and difficult to control the amount of addition, so as to improve the uniformity , Improve the anti-corrosion performance, improve the effect of absorption rate

Active Publication Date: 2017-01-25
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Associate Professor Li Li, the inventor of this application, developed a composite electrode in an attempt to improve the forming quality of workpieces by improving the anti-corrosion performance of the electrode, and filed an invention patent application in my country with the application number 201410130305.4. It is SiC and TiB with electroless copper plating on the surface 2 The micropowder is formed in the copper matrix by electrodeposition. Although the corrosion resistance of the tool electrode is improved to a certain extent, the SiC and TiB added to the electrode 2 The distribution is not uniform, and the amount of addition is not easy to control, which greatly affects the performance of the electrode

Method used

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  • A kind of preparation method of Cu-based SIC composite micropowder for electric discharge tool electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A Cu-based SiC composite micropowder for an electric discharge tool electrode was prepared according to the following steps in turn:

[0024] (1) SiC is made particle diameter and is the microparticle of 3um, is dissolved in the water of 1000 mass parts by the sodium hydroxide of the copper sulfate pentahydrate of 14 mass parts, the formaldehyde of 25 mass parts and 10 mass parts and makes electroless plating solution, Put the SiC particles into the electroless plating solution for electroless copper plating on the surface and dry them. The mass ratio of SiC particles to the electroless plating solution is 1:10 to obtain SiC copper-plated particles; the working temperature of electroless copper plating is 80°C, and the time is 3 Hour;

[0025] (2) Heating metallic pure Cu to 1150°C to obtain Cu melt;

[0026] (3) A conduit 2 is arranged in the funnel 1, the lower end of the conduit 2 is located at the nozzle 8 at the bottom of the funnel 1, and the upper end is connect...

Embodiment 2

[0030] The difference between this embodiment and embodiment one is: the particle diameter of SiC particles is 4um in the step (1), the mass fraction of copper sulfate pentahydrate in the electroless plating solution is 15 parts, and the mass fraction of formaldehyde is 28 parts , the mass fraction of sodium hydroxide is 11 parts; The heating temperature of metal pure Cu is 1165 ℃ in the step (2); The mesh number of the sieve is 125 mesh.

Embodiment 3

[0032] The difference between this embodiment and Example 1 is: the particle diameter of the SiC particles in step (1) is 5um, the mass fraction of copper sulfate pentahydrate in the electroless plating solution is 16 parts, and the mass fraction of formaldehyde is 32 parts , the mass fraction of sodium hydroxide is 12 parts; The heating temperature of metallic pure Cu is 1180 ℃ in the step (2); The sieve mesh is 150 mesh.

[0033] Using the above method, high-pressure nitrogen gas is used to blow SiC particles into the Cu melt at the bottom of the funnel 1. On the one hand, the floating phenomenon of SiC particles is avoided; on the other hand, the SiC particles are blown away to increase their distribution uniformity. And by adjusting the feeding amount of SiC copper-plated particles, the content of SiC particles can be flexibly controlled, so as to prepare tool electrodes with different needs.

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Abstract

The invention discloses a preparation method of Cu-based SiC composite micropowder for electric spark tool electrodes, which belongs to the technical field of electric spark discharge machining, and includes a funnel, and is characterized in that the surface of SiC particle is chemically copper-plated and dried to obtain SiC copper-plated particle ;Pour the Cu melt into the funnel, and add the SiC copper-plated particles into the uniform feeder, and the SiC copper-plated particles enter the conduit evenly through the feeding tube, and are blown out of the conduit under the uniform wind force of the high-pressure nitrogen source, and the Cu melt is coated On the periphery of the SiC copper-plated particles and leaked from the nozzle together, they are atomized into composite fine powder by gas. This method uses nitrogen to blow SiC particles into Cu melt, which improves the uniformity of SiC particle distribution; at the same time, by increasing the feeding speed of SiC copper-plated particles, the content of SiC particles can be flexibly increased, which is beneficial to improve the anti-corrosion performance.

Description

technical field [0001] The invention belongs to the technical field of electric discharge machining, and in particular relates to a method for preparing Cu-based SiC composite micropowder for electric discharge tool electrodes. Background technique [0002] Due to the incomparable superiority of other processing methods in processing special performance materials, complex structures and micro parts, EDM technology has been gradually promoted and applied in recent years. In the process of EDM, the electrode material that is melted, gasified, and exploded not only removes the material of the workpiece, but also removes the material of the tool electrode, which inevitably produces a tool electrode. The loss of the tool electrode is directly mapped to the workpiece, which affects its forming accuracy. [0003] In order to improve the forming accuracy of the workpiece, some experts and scholars have invested in the research of tool electrodes. Among them, Associate Professor Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F1/02C23C18/40
Inventor 李丽魏修亭田忠强王东
Owner SHANDONG UNIV OF TECH
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