A kind of preparation method of silver oxide/silver/copper three-layer composite strip

Abstract

The invention discloses a preparation method of a silver oxide / silver / copper three-layer composite tape. The method comprises the following steps: cleaning a silver oxide / silver composite tape and a copper tape, feeding the silver oxide / silver composite tape and the copper tape to a high-frequency induction furnace for heating, and controlling the heating temperature in the high-frequency induction furnace to be 500-750 DEG C; feeding the silver oxide / silver composite tape and the copper tape to a tube-type resistance furnace for heating, wherein the length of a heating zone in the tube-type resistance furnace is 0.8-1.5m; controlling the heating temperature in the tube-type resistance furnace to be 600-850 DEG C; feeing the silver oxide / silver composite tape and the copper tape to a roller for hot-rolling compounding to obtain the silver oxide / silver / copper three-layer composite tape; and carrying out cold rolling and finishing rolling on the obtained three-layer composite tape according to a conventional process, wherein the heating process in the tube-type resistance furnace and the process from the heating process to the process of feeding the tapes to the roller are carried out in a reducing protective atmosphere. The technology disclosed by the invention can quickly warm, is stable and controllable in temperature, can solve the problem of reducing atmosphere protection during heating, and effectively avoids a poor oxide zone.

Description

technical field [0001] The invention relates to a silver oxide / silver / copper layered electrical contact material, in particular to a method for preparing a silver oxide / silver / copper three-layer composite strip. Background technique [0002] In the application of contact materials, the contact blades are first welded on the contact pieces, and finally they can be assembled into electrical appliances for use. In order to obtain a better welding effect, one side of the contact piece needs to be pre-composited with a thinner silver layer (accounting for more than 20% of the total thickness of the contact piece), and this side will be used as a welding layer for welding with copper-based contacts. In the manufacture of electrical contacts, silver oxide materials are not conducive to hot rolling compounding, cold rolling, split shearing, stamping and other mechanical processing due to their high brittleness. Therefore, many manufacturers process them through internal oxidation of...

AI Technical Summary

Problems solved by technology

However, if only high-frequency induction furnace is used to heat various types of strips to be hot-rolled and compounded, it is difficult to obtain an ideal heating effect. The main reasons are:

[0005] 1. Use high-frequency induction to heat the strip. The inductance coefficients of metals such as silver oxide and copper in the induced magnetic field are different. The inductance of silver oxide is much larger than that of copper, that is, silver oxide is at least earlier than copper. 3, 4 seconds to reach red heat, if copper can also reach red heat, silver oxide will easily melt, when the temperature difference between the two is too large, the bonding strength of the strip after hot rolling and compounding is not ideal; to achieve If the temperature of the two strips is similar, the induction intensity of the copper strip must be greater. The only solution is to let the copper strip pass through the induction coil with more turns, but it is difficult to achieve in practice. This will complicate the structure of the induction coil, the insulation protection of the coil and the passage of the strip will be very difficult, and it is not universal;

[0006] 2. Usually the number of turns of the induction coil is not many, about 10 turns, and the length is not very long, about 12cm, that is to say, the heating channel is short, and it is possible that the entire channel is open, which means that the heating It is difficult to protect the atmosphere during the process. Some metals that are prone to oxidation, such as copper and iron mentioned in the patent, are easily oxidized when heated in the coil, which will inevitably affect the bonding strength of the composite strip.

[0007] 3. Induction heating is a fast heating method, and the output power is generally large. Once the hot rolling compound is not smooth, such as unexpected speed slowing down or stopping, it is easy to cause the strip in the coil to overheat and melt. This virtually increases the difficulty of operation

But the equipment investment of this technical scheme is relatively large

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