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A rapid compound preparation method of long strip silver graphite electrical contact material and solder strip

An electric contact material, silver graphite technology, applied in the field of material processing, can solve the problems of weak interface bonding strength, shedding, low yield, etc., and achieve the effect of simplified process, uniform thickness, and high yield

Active Publication Date: 2019-08-30
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During extrusion, the undensified interface often leads to peeling and peeling of the outer coating layer, that is, the pure silver layer, and the interface bonding strength is weak. A continuous pure silver layer cannot be formed on the extruded silver-graphite strip. Low
[0008] 2. The above-mentioned patent needs to obtain a pure silver layer with controllable thickness. When the pure silver layer of the outer wrapping layer is squeezed, a part of the pure silver layer of the wrapping layer will become waste to form a hollow cylindrical pure silver material, and the remaining wrapping layer The pure silver layer is formed after extrusion, and the utilization rate of the pure silver layer of the wrapping layer is low
[0009] 3. The silver-graphite strip with a pure silver layer obtained after extruding the ingot in the above patent can be inferred to have a three-layer structure, and the silver-graphite material is between the upper and lower layers of pure silver, namely Ag / AgC / Ag structure, which leads to the need to remove the pure silver layer on one surface, such as subsequent polishing, which is similar to the removal of the pure silver layer after the overall decarburization of silver graphite. The silver graphite is exposed as a working layer, and subsequent processing is difficult and time-consuming.

Method used

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  • A rapid compound preparation method of long strip silver graphite electrical contact material and solder strip
  • A rapid compound preparation method of long strip silver graphite electrical contact material and solder strip
  • A rapid compound preparation method of long strip silver graphite electrical contact material and solder strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Taking the preparation of AgC4 electrical contact material as an example, the specific preparation consists of the following steps:

[0042] (1) An AgC4 ingot with a diameter of 90 mm was prepared by powder metallurgy technology, and hot-extruded after sintering at 750 ° C for 3 hours to obtain a figure 2 Long continuous AgC4 plate with card groove structure, the thickness of the plate is 2.1mm, and the length is 35-45m;

[0043] (2) Evenly clamp the BCu88PAg strip in the AgC4 slot, and sinter the composite solder. The sintering temperature is 730°C, and the protective atmosphere is hydrogen, so that the AgC4 and the solder are tightly combined;

[0044] (3) The AgC4 plate after the composite strip is subjected to multiple cold rolling and annealing heat treatments, and then rolled to the required thickness of the finished product.

[0045] In this step, each rolling deformation is 12%-16%, the annealing temperature is 500°C, the annealing time is 1h, and the protective...

Embodiment 2

[0048] Taking the preparation of AgC3 electrical contact material as an example, the specific preparation consists of the following steps:

[0049] (1) An AgC3 ingot with a diameter of 100 mm was prepared by powder metallurgy technology, and hot-extruded after sintering at 740 ° C for 3.5 hours to obtain a long AgC3 plate with a U-shaped structure with a slot, and the thickness of the plate was 3.3 mm. The length is 25-35m;

[0050] (2) Put the BAg25CuZn solder strip evenly and flatly in the AgC3 slot to sinter the composite solder, the temperature is 740°C, and the protective atmosphere is hydrogen, so that the AgC3 and the strip are tightly bonded;

[0051] (3) The AgC3 plate after the composite strip is subjected to multiple cold rolling and annealing heat treatments, and then rolled to the required thickness of the finished product.

[0052] In this step, each rolling deformation is 15%-20%, the annealing temperature is 490°C, the annealing time is 1.5h, and the protectiv...

Embodiment 3

[0055] Taking the preparation of AgC5 electrical contact material as an example, the specific preparation includes the following steps:

[0056] (1) An AgC5 ingot with a diameter of 100 mm was prepared by powder metallurgy technology, and hot-extruded after sintering at 760 ° C for 3 hours to obtain a long AgC5 plate with a U-shaped structure with a slot. The thickness of the plate is 3.4 mm, and the length 25-35m;

[0057] (2) Put the BAg30CuZnSn solder strip evenly and flatly in the AgC5 slot to sinter the composite solder, the temperature is 770°C, and the protective atmosphere is hydrogen, so that the AgC5 and the strip are tightly bonded;

[0058] (3) The AgC5 plate after the composite strip is subjected to multiple cold rolling and annealing heat treatments, and then rolled to the required thickness of the finished product.

[0059] In this step, each rolling deformation is 15%-20%, the annealing temperature is 495°C, the annealing time is 2h, and the protective atmosph...

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Abstract

The invention discloses a rapid composite preparation method of a long silver graphite electrical contact material and a solder strip. The steps are as follows: the first step is to prepare a silver graphite ingot into a silver graphite electrical contact plate by an extrusion process; the second step is to The solder strip is sintered and compounded with the silver graphite electrical contact plate to obtain a composite blank; the third step is to carry out rolling and heat treatment on the composite blank, and the rolling and heat treatment are performed once or multiple times to complete the strip silver Combination of graphite electrical contact material with solder ribbon. The invention can realize the efficient and rapid compounding of the long silver graphite electrical contact plate and the solder strip, and produce products with good interface bonding quality and high product size precision, which can realize continuous, short process, and facilitate the realization of welding automation. It is a kind of A new method for preparing composite solder for silver-based electrical contact materials.

Description

technical field [0001] The invention discloses a preparation method of composite solder for electrical contact materials, in particular a short-flow and high-efficiency preparation method for rapid compounding of long silver-based electrical contact materials and solder strips, belonging to the field of low-voltage electrical contact material preparation and material processing. . Background technique [0002] Electrical contact materials are responsible for the tasks of connecting, breaking, carrying and isolating current in switching appliances, and are key functional materials in switching appliances. In order to achieve effective welding of electrical contact materials, contact bridges, and contact plates, a large number of brazing techniques are used, especially for electrical contacts of large-capacity switches. The quality of brazing affects the reliability of electrical appliances and the arc of electrical contacts Burning loss and service life have a very important...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H11/06H01H1/023H01H1/027
CPCH01H1/023H01H1/027H01H11/06H01H2011/067Y10T29/49204Y10T29/49218
Inventor 张泽忠吴新合穆成法祁更新黄伟陈林驰
Owner WENZHOU HONGFENG ELECTRICAL ALLOY