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

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...

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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

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