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A kind of preparation method of silver-graphite ribbon contact material with solderable parallel structure

A contact material, silver graphite technology, applied in the direction of electrical components, electrical switches, circuits, etc., can solve the problem of affecting the solderability of contacts in mass production, limiting the range of final product size, and the thickness and size of contacts should not be too thin, etc. , to improve the processing performance and weldability, reduce the sintering process, and avoid poor workability.

Active Publication Date: 2019-09-06
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical scheme, it is mentioned that silver graphite ingots are decarburized to obtain a silver layer. The silver layer obtained by this process is affected by the temperature and atmosphere during decarburization, and there is a problem of uneven decarburization in the actual production process, so that It affects the performance of the contact and subsequent welding; on the other hand, in order to improve the compactness of the material, the extrusion used is relatively large, which limits the size range of the final product. The thickness of the contact is often not too thin or too thick. Therefore, the technology of this invention still has certain limitations, which affects the mass production of products and the weldability of contacts.

Method used

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  • A kind of preparation method of silver-graphite ribbon contact material with solderable parallel structure
  • A kind of preparation method of silver-graphite ribbon contact material with solderable parallel structure
  • A kind of preparation method of silver-graphite ribbon contact material with solderable parallel structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Calculate the required amount of silver powder and graphite powder according to the material ratio for preparing 10kg AgC (3), weigh 9.7kg silver powder and 0.3kg silver graphite powder, and mix the powder on a double cone mixer at a speed of 25r / min. Time 2h, obtain mixed powder;

[0045] 2) the resulting mixed powder is placed on an isostatic pressing device for molding, and the molding pressure is 100MPa to obtain a silver graphite billet;

[0046] 3) The gained silver-graphite billet is placed in the decarburization furnace, feeds compressed air into the decarburization furnace, the air flow rate is 5L / min, the temperature is raised to 650° C., and the decarburization is carried out for 6 hours to obtain the decarburized silver-graphite billet;

[0047] 4) The obtained decarburized silver-graphite ingot is placed in a sintering furnace, and sintered under the protection of hydrogen at a sintering temperature of 800° C. for 5 hours to obtain a sintered silver-grap...

Embodiment 2

[0060] Repeat Example 1, the difference is:

[0061] In step 2), the isostatic pressing pressure is 150MPa;

[0062] In step 3), the flow rate of compressed air into the decarburization furnace is 9L / min, the decarburization temperature is 700°C, and the time is 2h;

[0063] In step 4), the sintering temperature is 900°C and the time is 3h;

[0064] In step 5), the extrusion temperature is 800° C., and the extrusion ratio is 80.

Embodiment 3

[0066] Repeat Example 1, the difference is:

[0067] In step 2), the isostatic pressing pressure is 130MPa;

[0068] In step 3), the flow rate of compressed air into the decarburization furnace is 8L / min, the decarburization temperature is 750°C, and the time is 3h;

[0069] In step 4), the sintering temperature is 850°C and the time is 4h;

[0070] In step 5), the extrusion temperature is 750° C., and the extrusion ratio is 200.

[0071] Metallographic structure analysis is carried out to the contact material that above-mentioned embodiment 1 and comparative example 1 make, respectively as follows figure 2 and 4 shown.

[0072] The metallographic structure analysis was carried out after the contact materials prepared in the above-mentioned embodiment 1 and comparative example 1 were subjected to materialless resistance welding, respectively as follows image 3 and 5 shown.

[0073] Depend on Figure 2-5 It can be seen that the metallographic structure of the silver g...

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Abstract

The invention discloses a preparation method of silver-graphite ribbon contact materials of a high-weldability parallel structure. The method comprises the following step 1) of computing the requiredamounts of graphite powder and silver powder according to the proportion of materials of a silver graphite electrical contact to be prepared, and mixing the graphite powder and the silver powder afterweighing to obtain mixed powder; the step 2) of making the mixed powder subjected to isostatic press molding to obtain a silver graphite billet; the step 3) of decarburizing the silver graphite billet to obtain the decarburized silver graphite billet; the step 4) of sintering the decarburized silver graphite billet in shielding gas atmosphere to obtain the sintered silver graphite billet; and thestep 5) performing normal extrusion, normal-temperature rolling and normal finish rolling for the sintered silver graphite billet. The method stated in the invention is simple, and low in productioncost, and the processability and weldability of the contact materials can be improved effectively.

Description

technical field [0001] The invention relates to a silver-graphite contact material, in particular to a preparation method of a high-weldability parallel-structure silver-graphite strip-shaped contact material. Background technique [0002] The existing silver-graphite (AgC) contact preparation process is mainly divided into two categories: one is the powder monolithic pressing process, and the other is the extrusion process, of which: [0003] The single-chip pressing process is to put silver graphite powder into the mold cavity for pressure pressing, process it into a sheet contact, and then process it into a finished sheet contact through sintering, repressing, post-processing and other processes; the contacts are welded with silver The layer (Ag) can be formed by pressing the silver graphite layer and the silver layer through the pressure pressing process (that is, it is processed into AgC / Ag contacts in the pressure pressing stage), and the soldered silver layer can also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/04B22F3/10B22F3/24H01H11/04
Inventor 蒋德志谭光讯黄锡文罗春华金红唐更生
Owner 桂林金格电工电子材料科技有限公司
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