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Method for preparing silver-graphite electrical contact belt

A silver-graphite, electrical contact technology, applied in contacts, circuits, electrical switches, etc., can solve the problems of poor silver-graphite processing performance, increased consumption, increased strip processing products, etc., to achieve uniform and stable fluidity, prevent The effect of solder oxidation and solder composition stabilization

Active Publication Date: 2011-05-04
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these two processes, because process 1 adopts double-sided decarburization and then removes the silver layer on one side, the preparation process will lead to increased consumption of Ag, resulting in increased finished products of the strip, which is not suitable for mass production. Removing the silver layer by chemical etching will cause environmental pollution and is not conducive to the three wastes treatment of the production enterprise; process 2 solves the stability of the prepared contact size very well, and can be prepared into rolls and strips, which is suitable for batch automation component production , but there is a fatal shortcoming, that is, the processing performance of silver graphite itself is poor. During the rolling process of silver graphite, it is easy to have the defects of strip breakage or cracking, so it is difficult to prepare longer strips.
At the same time, in the domestic prior art, there is no related introduction of AgC strip with solder layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix -200 mesh atomized silver powder, -350 mesh chemical silver powder, and spherical graphite powder with an average particle size of 1-5 μm in a ratio of 48:48:4, press the ingot, sinter, and then coat the outside of the ingot with a 3mm silver layer. Extrusion pressure compound silver is carried out on the extruder. After extruding pressure and silvering, the specification of silver-graphite silver-coating strip is 35*2mm, and then through repeated cold rolling-annealing process, rolling to a thickness of 1.0mm, and coating 0.06mm thick Ag15CuP5 solder on medium-frequency induction heating equipment to prepare The silver-graphite strip with multiple silver and multiple solder is strip-rolled on a strip rolling mill.

Embodiment 2

[0022] Mix -200 mesh atomized silver powder, -350 mesh chemical silver powder, and spherical graphite powder with an average particle size of 1-5 μm in a ratio of 48.5:48.5:3, press the ingot, sinter, and then coat the outside of the ingot with a 4mm silver layer. Extrusion pressure compound silver is carried out on the extruder. After extruding pressure and silvering, the specification of silver-graphite silver-coating strip is 35*2mm, and then through repeated cold rolling-annealing process, rolling to a thickness of 0.5mm, and coating 0.06mm thick Ag15CuP5 solder on medium-frequency induction heating equipment to prepare The silver-graphite strip with multiple silver and multiple solder is strip-rolled on a strip rolling mill.

Embodiment 3

[0024] Mix -200 mesh atomized silver powder, -350 mesh chemical silver powder, spherical graphite powder with an average particle size of 1-5 μm, and fiber graphite powder with an average length-to-diameter ratio of 3 in a ratio of 48:48:2:2, then press into ingots and sinter , and then the outside of the ingot is coated with a 3.5mm silver layer, and the silver is extruded and pressed on a 1100mm extruder. After extruding pressure and silvering, the specification of silver-graphite silver-coated strip is 35*2mm, and then through repeated cold rolling-annealing process, rolled to a thickness of 0.8mm, and coated with 0.06mm thick Ag15CuP5 solder on medium-frequency induction heating equipment, and prepared The silver-graphite strip with multiple silver and multiple solder is strip-rolled on a strip rolling mill.

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Abstract

The invention discloses a method for preparing a silver-graphite electrical contact belt. A silver-graphite electrical contact belt finished product is prepared by the following steps: preparing a silver-graphite ingot; preparing a silver compounded silver-graphite belt; rolling a silver compounded belt; compounding a solder to the silver compounded belt; moulding and rolling a silver and solder-compounded silver-graphite belt and polishing, deoiling and drying and carrying out other surface treatments. The invention has the advantages of uniform, stable and controllable thickness of a silvercompounded layer, favorable compounding strength and weldability, uniform and stable solder layer, and the like.

Description

technical field [0001] The invention belongs to the field of metal matrix composite materials, and specifically refers to a preparation method of an electrical contact strip, in particular to a preparation method of a silver graphite electrical contact strip. Background technique [0002] Silver graphite electrical contact materials are widely used in molded case circuit breakers, frame circuit breakers and household miniature circuit breakers because of their good welding resistance and electrical conductivity, low and stable contact resistance and excellent low temperature rise characteristics. [0003] There are two processes for the preparation of existing silver-graphite electrical contact materials: one is the powder mixing process, in which the silver powder and graphite powder are silver powders with a single particle size; the other is the chemical coating process to prepare silver-graphite composite powder. Among them, the silver-graphite strip prepared by the mixe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/023
Inventor 林万焕张明江翁桅柏小平刘立强宋林云
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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