Preparation method of gold-containing three-layer micro-profile electrical contact material

Abstract

The invention relates to a preparation method of a gold-containing three-layer micro deformed electric contact material. The material is characterized in that a surface layer material is pure gold, an intermediate layer of the material is silver or silver alloy, a basic material is a copper alloy layered composite deformed band material, the thickness of the band material is 0.2mm to 1.5mm, the width of the band material is 0.3mm to 3mm, the thickness of the intermediate layer of the silver or silver alloy is more than or equal to that of the basic material, and the thickness of the gold layer is less than or equal to 0.005mm. By adopting a method for combining a secondary compositing technology and a deformed precision machining technology, the prepared gold-containing three-layer micro deformed electric contact material has the advantages that the production efficiency is high, the size consistency is good, the compositing firmness is high, the metal layer is not diffused, the chemical stability is high, the electric contact performance is stable and reliable, and the like, and the production flow of the preparation method is short.

Description

technical field [0001] The invention relates to a material compounding method, in particular to a preparation method of a gold-containing three-layer micro-shaped electrical contact material. Background technique [0002] The gold-containing three-layer micro-shaped electrical contact material is a type of special-shaped composite material with a small cross-section to meet the needs of the development of relays and switch thermostats in the direction of miniaturization, high precision, and integration. Gold-containing three-layer micro-shaped electrical contact materials are usually composed of substrate copper alloy, precious metal silver alloy and gold alloy, and its cross-sectional area is ≤1mm 2 , and the cross-section is irregular, mostly triangular, trapezoidal and other shapes, which changed the early single noble metal and its alloy materials in many fields often could not meet the special performance requirements. Therefore, materials with different properties are ...

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Problems solved by technology

[0003] Gold-containing three-layer micro-shaped electrical contact material is a high-tech product prepared by combining new technology and high-precision equipment. It is a key material for the manufacture of electrical contact components in instrumentation, telecommunications and electronic equipment. Its performance and dimensional positioning accuracy requirements High, complex manufacturing process

[0004] Patent application number 01134998.0 provides a method for preparing an ultra-thin electrical contact layer of a micro-shaped composite contact strip. Although the invention greatly saves precious metals, the electrical contact layer has high purity, uniform composition, uniform thickness, and good surface quality. The quality stability of the electrical contact layer can be obtained, and the alloy electrical contact layer can be obtained, and the electrical contact layer and the intermediate layer are firmly combined. However, due to the use of magnetron sputtering technology, there are the following disadvantages: 1. The magnetron sputtering equipment is more expensive , the investment is large; 2. The utilization rate of gold in the magnetron sputtering process is low, the cost is high, and the capital occupation is large, and it is not convenient for the production method of small batches and multiple specifications; patent application number 200810069387.0 provides an electric A method for preparing a contact composite material, using the method of the invention to make a gold-containing three-layer electrical contact material, is mainly used in the field of micro-motors, and has the advantages of simple preparation method and low cost

However, if this method is used to produce a material with an ultra-thin gold layer, a thicker middle layer and a base layer, especially a material whose thickness of the middle layer exceeds the thickness of the base layer, there will be a problem that the compounding is not easy to control, and it is easy to cause broken gold, gold shortage, etc. At the same time, the gold layer is easy to diffuse under the condition of high-frequency induction heating, thereby forming an alloy with the middle layer metal, which seriously affects the electrical contact performance of the gold layer

In addition, high-frequency induction heating composite method is used for production. In the case of wide material, there is also the phenomenon of uneven heating, which has the disadvantage of affecting the composite fastness.

Because this method can only be composited with narrow strips (usually less than 6mm), the production efficiency is low

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