Preparation process of a high brazing rate vertical fiber silver graphite electrical contact

A silver-graphite, electrical contact technology, applied in circuits, electrical switches, electrical components, etc., can solve the problems of excessive solder layer exhaust, inconsistent contact temperature, affecting the soldering rate of soldering, and improve the density and soldering quality. The effect of stabilizing and improving the anti-burning ability

Active Publication Date: 2019-02-01
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) In the middle and late stages of welding, on the one hand, the expanding gas continues to enter the molten solder, on the other hand, the molten solder begins to cool and solidify, and finally part of the gas remains inside the solidified solder, forming solder pores, which affects the welding rate;
[0006] (4) For medium and large-sized vertical fiber silver graphite contacts, due to the large size, it is difficult to ensure the uniformity of heating regardless of the method of resistance welding or induction welding, and the temperature of each part of the contact is inconsistent
In the area with high temperature, the pores of the decarburized layer of the contact point exhaust more to the solder layer, the brazing rate is low, and the welding quality control is more difficult

Method used

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  • Preparation process of a high brazing rate vertical fiber silver graphite electrical contact

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Experimental program
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Effect test

Embodiment 1

[0024] Slice the 7x7 vertical fiber silver graphite wire into 7x7x2.5mm; then put the sliced ​​vertical fiber silver graphite into the decarburization boat, and oxidize it in a resistance furnace at 650°C for 30 minutes to obtain a 0.1mm decarburization silver layer; after decarburization The vertical fiber silver graphite is sintered in a hydrogen furnace at 900°C for 2 hours; after sintering, it is repressed, and the pattern mark is pressed on both sides, and the repressing pressure is 5.5 tons; the vertical fiber silver graphite sheet is sliced ​​into two, and the vertical fiber with a size of 7x7x1mm is obtained. Fiber silver graphite contact; after cutting, the vertical fiber silver graphite contact is ground for 30 minutes to remove knife marks, polished for 2 minutes and cleaned and dried; after drying, the drying temperature is set at 120°C for 3 hours. The vertical fiber silver-graphite contacts prepared by induction welding and resistance welding were scanned by ultra...

Embodiment 2

[0026] Cut the 8x8 vertical fiber silver graphite wire into 8x8x5.5mm; then put the sliced ​​vertical fiber silver graphite into the decarburization boat, and oxidize it in a resistance furnace at 600°C for 50 minutes to obtain a 0.2mm decarburization silver layer; after decarburization The vertical fiber silver graphite is sintered in a hydrogen furnace at 800 ° C for 4 hours; then the vertical fiber silver graphite is repressed after sintering, and the pattern marks are pressed on both sides, and the repressing pressure is 7 tons; the vertical fiber silver graphite slices are cut into two, Obtain 8x8x2.5mm vertical fiber silver graphite contacts; grind the cut vertical fiber silver graphite contacts for 25 minutes to remove knife marks, polish for 2 minutes and clean and dry; after drying, set the drying temperature at 150°C for 2.5 hours . The vertical fiber silver-graphite contacts prepared by induction welding and resistance welding respectively are scanned by ultrasonic ...

Embodiment 3

[0028] Cut the 11x11 vertical fiber silver graphite wire into 11x11x4.5mm; then put the sliced ​​vertical fiber silver graphite into the decarburization boat, and oxidize it in a resistance furnace at 700°C for 40 minutes to obtain a 0.2mm decarburization silver layer; after decarburization The vertical fiber silver graphite is sintered in a hydrogen furnace at 880°C for 4 hours; then the sintered vertical fiber silver graphite is repressed, and the pattern marks are pressed on both sides, and the repressing pressure is 13 tons; the vertical fiber silver graphite slices are cut into two, Obtain 11x11x2mm vertical fiber silver graphite contacts; grind the cut vertical fiber silver graphite contacts for 40 minutes to remove knife marks, polish for 2 minutes and clean and dry; after drying, set the drying temperature at 150°C for 3 hours. The vertical fiber silver-graphite contacts prepared by induction welding and resistance welding respectively are scanned by ultrasonic waves, a...

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Abstract

The invention discloses a preparation process of a high brazing rate vertical fiber silver graphite electrical contact, which comprises the following steps: (1) slice the silver graphite wire material containing vertical fibers; (2) decarburize; (3) decarburize After carbonization, the vertical fiber silver graphite material is loaded into the sintering furnace (4) and repressed; (5) the embossed vertical fiber silver graphite sheet is cut into two, and one side is a vertical fiber silver graphite surface, and the other side is a decarburized silver layer. Vertical fiber silver graphite contact; (6) Grind, polish and dry the vertical fiber silver graphite contact in a grinding machine after cutting; (7) Dry the vertical fiber silver graphite contact in an oven for the final product. The process described in the invention can sinter the decarburized layer of vertical fiber silver graphite, change the structure of the decarburized layer, eliminate the pores inside the decarburized layer due to decarburization, and greatly improve the welding of decarburized silver graphite products under the same welding conditions quality.

Description

technical field [0001] The invention relates to the field of electric contact materials, in particular to a preparation process of a vertical fiber silver graphite material with high brazing rate. Background technique [0002] Electrical contacts are the core key components of electrical switches. Silver graphite electrical contacts, especially vertical fiber silver graphite electrical contacts, have been widely used in foreign countries due to their good electrical conductivity, low and stable contact resistance, and excellent anti-welding ability. Widely used in miniature circuit breakers and molded case circuit breakers as static contacts. In China, only small-scale silver-graphite contacts are widely used in miniature circuit breakers. In molded case circuit breakers, there are certain technical difficulties in the promotion of medium- and large-scale silver-graphite contacts. The main manifestations are: [0003] (1) The soldering rate of medium and large size vertica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H11/04
CPCH01H11/048
Inventor 林旭彤宋振阳费家祥孔欣柏小平林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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