A kind of preparation method of silver-copper composite electrode

Abstract

The invention discloses a method for preparing a silver-copper composite electrode. The method comprises the following steps: 1. Cleaning a copper rod and a silver tube after polishing, and then inserting the copper rod into the silver tube to obtain a silver-copper rod; 2. 1. Clean the steel pipe, then spray the side surface of the silver-copper rod with the suspension of the release agent and blow it dry, and then insert it into the steel pipe to obtain the blank; 3. Carry out vacuum diffusion welding on the blank to obtain the steel pipe-silver-copper composite material ; 4. Remove the steel pipe-silver-copper composite material from the steel pipe to obtain a silver-copper composite rod; 5. Remove both ends of the silver-copper composite rod and then perform finishing to obtain a silver-copper composite electrode. The present invention adopts interference fit and vacuum diffusion welding to realize the preparation of silver-copper composite electrode, and the prepared silver-copper composite electrode has the advantages of high interface bonding strength, precise control of interface structure, high reliability and good electrical conductivity, and improves The utilization rate of raw materials and the yield rate of products are improved, and the manufacturing cost of silver-copper composite electrodes is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of a silver-copper composite electrode. Background technique [0002] Among metal materials, pure silver has the best conductivity, so in many cases it is necessary to use pure silver to make electrodes, for example: in order to improve the sealing of CO 2 The working life of the laser requires the selection of pure silver electrodes; using the property that pure silver can maintain good conductivity under oxidizing atmosphere conditions, pure silver electrodes are used in fuel cell components; in the electrolysis industry, in order to solve the electrode problems caused by electrochemical polarization / Liquid interface electrical instability, large electrical noise and other issues usually use pure silver electrodes, etc., but on the other hand, silver is a rare and precious metal, which makes the manufacturing cost of pure...

AI Technical Summary

Problems solved by technology

[0004] According to different conditions of use, there are various forms of electrodes. For electrodes with complex shapes, it is still difficult to realize the replacement of internal materials while ensuring sufficient conductivity. At present, the preparation of silver-copper composite The electrode methods mainly include immersion method, vacuum brazing method and explosive welding method. Among them, the immersion method refers to melting silver into a liquid state, and then immersing solid copper in it, keeping it for a certain period of time and then taking it out, so as to achieve silver and copper. The processing principle of this method is simple, but the process control is more difficult. For example, the difference in heating and cooling speeds at the interface will lead to defects such as excessive melting, porosity, and holes. In order to ensure the fluidity of silver, it is usually necessary to process copper. Heating, so special processing equipment is required, the interface microstructure is difficult to control, which affects the conductivity of the electrode, etc.; the vacuum brazing method refers to the assembly of silver tubes and copper rods according to a certain size, and a certain arrangement between the two The brazing material of the composition is assembled into a billet. Under a certain degree of vacuum, the billet is heated and kept for an appropriate time, and then slowly cooled to obtain a silver-copper composite electrode. Under the condition that the process parameters are selected reasonably, this method can produce interface bonded electrodes. It is a good composite electrode, but there are problems such as difficult solder arrangement, difficult interface structure control, and poor electrode conductivity; the explosive welding method uses the energy generated by the explosive explosion to make oblique collisions between silver and copper, and in the force and heat Metallurgical bonding is produced under the double action. The composite electrode prepared by this method has high bonding strength, but due to the low strength of silver, punching is easy to occur during the composite process, and local melting, pinholes, and spot-like irregularities are prone to occur at the bonding interface. Defects such as bonding affect the conductivity of the composite electrode to a certain extent.

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