Method for fabricating contact silver-coated layer by screen printing

Abstract

The invention discloses a method for fabricating a contact silver-coated layer by screen printing. The method comprises the following steps of: preparing silver powder stuff and arranging a contact in a mold prepared in advance at first; then covering a screen mold on the mold holding the contact; slowly pouring the prepared silver stuff into the screen mold to ensure that the silver stuff slowlypermeates into the surface of a silver alloy contact inside a lower mold to form a uniform silver-coated layer; after the addition of the silver stuff is finished, taking the whole lower mold having the silver contact out for sintering; and placing the mold having the silver contact into a specified sintering furnace for sintering to finish the fabrication of the silver alloy contact. The method has the advantages of avoiding a rolling composite process, discovering a new process route for fabricating the silver-coated layer of the silver alloy contact and ensuring the bonding strength of thesilver-coated layer, along with simple operation, suitability for mass production and high product consistency.

Description

technical field [0001] The invention relates to a method for manufacturing a silver alloy contact, in particular to a method for manufacturing a silver-clad layer of a silver alloy contact. Background technique [0002] Most of the silver alloy sheet contacts of existing circuit breakers exist in the form of oxides, such as silver tin oxide contact materials, which cannot be directly welded to the contact bridge of the support body, and must be in the form of silver alloy during the welding process. The silver-clad layer is made on the welding surface of the contact to help welding. The traditional method of making the silver-clad layer relies on the hot-rolling composite process, and the silver layer and the silver alloy are combined by mechanical deformation to form the silver-clad layer. But this method has the following disadvantages: [0003] 1. The process is complex, including the production of silver alloy plates, the production of silver plates; and the mechanical ...

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Problems solved by technology

[0003] 1. The process is complex, including the production of silver alloy plates, the production of silver plates; and the mechanical welding and compounding of silver plates and silver alloy plates, as well as subsequent hot rolling processes;

[0004] 2. The process has certain risks, mainly because when the silver plate and silver alloy plate are mechanically combined, the cleanliness of the joint surface is very high. If there is pollution, it may cause problems in the composite strength; at the same time, the joint surface cannot be oxidized after compounding. Otherwise, it will also affect the composite strength and cause hidden dangers to the quality of the contacts;

[0005] 3. When the hot-rolled composite plate is punched in the later stage, the remaining mesh material is a waste, and the redundant silver plate needs to be recycled, which increases the cost

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