A silver-based multilayer composite electrical contact material and its preparation method

Abstract

The invention discloses a silver-based multi-layer composite electrical contact material and a preparation method thereof. The silver-based multi-layer composite electrical contact material comprisesa working layer, an intermediate layer, a welding layer and a soldering layer, wherein the intermediate layer is arranged between the working layer and the welding layer, a pure silver or silver alloysoldering layer is arranged between the intermediate layer and the working layer, the material of the welding layer is cheap metal iron or iron-based alloy, the material of the intermediate layer ischeap metal copper or copper alloy, and the material of the working layer is one of AgMeO systems. The material is prepared by directional combination rolling, continuous diffusion annealing and coldrolling. Due to the presence of Cu and Fe, a large amount of silver can be saved, and the cost is substantially reduced; and the operation process has the advantages of good material consistency, highpracticability and the like and is simple and controllable, is suitable for mass production, the prepared silver-based multi-layer composite electrical contact material has the advantages of high conductivity, favorable bonding strength and weldability and can be widely applied to industry of a temperature controller, a contact is attractive in positioning, and the influence on thermal deformation of a welding piece is small.

Description

technical field [0001] The invention discloses a silver-based multilayer composite electrical contact material and a preparation method thereof, in particular to a multilayer metal composite electrical contact material, which belongs to the technical field of low-voltage electrical appliance electrical contact materials. Background technique [0002] Silver-based metal oxide (AgMeO) contact material refers to a material in which dispersed metal oxide particles are distributed in a silver matrix. It has excellent electrical conductivity, welding resistance, arc erosion resistance and service life. It is used in low-voltage electrical appliances has broad application prospects. [0003] In low-voltage electrical appliances such as low-power relays and switches, AgMeO, AgM copper-clad bimetal composite rivets, and AgM copper-clad and its alloy bimetal composite strip electrical contact materials have been widely used. Usually the thickness of this type of bimetal composite str...

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Problems solved by technology

Although the above composite technologies have been applied in production and have their own advantages, there are inevitably some disadvantages at the same time. For example, the bonding interface of explosive welding materials tends to show waves and affect its bonding strength, and the product size is difficult to control and cannot be continuously produced.

[0005] After searching, the Chinese patent application number is CN200710065631.1, and the publication number is CN101034632A. This patent discloses a silver-based three-layer metal composite electrical contact material. It is a three-layer material in terms of metallographic structure, and the thickness of the working layer accounts for 10% of the overall thickness. 32%, which is unfavorable for the reduction of silver consumption and production cost, and it adopts solder to weld AgMeO (or AgM) and Cu together in a vacuum furnace, and then cold-rolls to the finished product thickness. Although the flow process of the preparation process is simple, but The cost of preparation is relatively high

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