Preparation technology of high-braded-rate vertical fiber silver graphite electric contact

Abstract

The invention discloses a preparation technology of a high-braded-rate vertical fiber silver graphite electric contact, which comprises the working procedures of (1) slicing a silver graphite wire material containing vertical fibers; (2) carrying out decarburization; (3) loading the decarburized vertical fiber silver graphite material into a sintering furnace; (4) re-pressing; (5) cutting an embossed vertical fiber silver graphite sheet into two parts so as to acquire a vertical fiber silver graphite contact with one side being a vertical fiber silver graphite surface and the other side being a decarburized silver layer; (6) grinding the cut vertical fiber silver graphite contact in a grinder into which an abrasive is added, polishing and dewatering; and (7) drying the dewatered vertical fiber silver graphite contact by using a drying oven so as to acquire a final finished product. The technology disclosed by the invention can enable the decarburized layer of the vertical fiber silver graphite to be sintered, so that the structure of the decarburized layer is changed, air holes generated inside the decarburized layer because of decarburization are eliminated, and the welding quality of decarburized silver graphite products is greatly improved under the same welding condition.

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...

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

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