Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool

A tool electrode and electric spark technology, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems such as difficult to control the amount of addition, uneven distribution, and affecting the performance of the electrode, so as to improve the anti-electricity Corrosion properties, improve uniformity, increase the effect of bonding strength

Active Publication Date: 2015-10-14
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool

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 into particles with a particle size of 3um, and an electroless plating solution is prepared by dissolving 14 parts by mass of copper sulfate pentahydrate, 25 parts by mass of formaldehyde and 10 parts by mass of sodium hydroxide in 1000 parts by mass of water, 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 prepare Cu melt;

[0026] (3) Install a conduit 2 in the funnel 1, the lower end of the conduit 2 is located at the nozzle 8 at the bottom of the funnel 1, the upper end is connected to the h...

Embodiment 2

[0030] The difference between this example and Example 1 is that the particle size of SiC particles in step (1) is 4um, 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 metallic pure Cu in step (2) is 1165°C; the gas supply pressure of gas supply device 6 in step (3) is 1.3 MPa; The mesh number of the sieve is 125 mesh.

Embodiment 3

[0032] The difference between this example and Example 1 is that the particle size of 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 in step (2) is 1180°C; the gas supply pressure of gas supply device 6 in step (3) is 1.4 MPa; The sieve mesh is 150 mesh.

[0033] The above method uses high-pressure nitrogen 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 method for preparing Cu-based SiC composite micro powder for an electrode of an electric spark tool and belongs to the technical field of electric discharge machining. The method relates to a funnel. The method is characterized in that electroless copper plating and drying are conducted on the surface of SiC particles, so that SiC copper-plated particles are obtained; molten Cu is poured into the funnel, the SiC copper-plated particles are added into a uniform feeder, the SiC copper-plated particles enter a guide pipe evenly by means of a feeding pipe and are blown out of the guide pipe under the constant-speed wind force of a high-pressure nitrogen source, the peripheries of the SiC copper-plated particles are wrapped in the molten Cu, the SiC copper-plated particles drip down from a discharge spout together with the molten Cu, and the SiC copper-plated particles wrapped by the molten Cu are atomized into composite micro powder by means of gas. According to the method, the SiC particles are blown into the molten Cu in a dispersed mode by means of nitrogen, and thus the distribution uniformity of the SiC particles is improved; meanwhile, by increasing the feeding speed of the SiC copper-plated particles, the content of the SiC particles can be flexibly increased, and the electric corrosion resistance can be improved easily.

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 Applications(China)
IPC IPC(8): B22F9/08B22F1/02C23C18/40
Inventor 李丽田忠强王东
Owner SHANDONG UNIV OF TECH
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