Parallel fiber reinforced silver graphite strip-shaped contact material and preparation method thereof

Abstract

The invention discloses a parallel fiber reinforced silver graphite strip-shaped contact material and a preparation method thereof. The material is composed of a working layer and a welding layer, wherein the welding layer is made of silver-copper alloy. The preparation method comprises the steps that silver graphite powder and silver-copper alloy powder are pressed into a composite ingot blank with a silver-copper alloy layer wrapping a silver graphite layer, then sintering, re-pressing and backward extrusion are conducted to obtain a silver graphite / silver-copper alloy composite strip, and the composite strip is subjected to hot rolling, longitudinal shearing, rolling, surface treatment and other procedures to obtain a silver graphite strip-shaped contact finished product. The parallel fiber reinforced silver graphite strip-shaped contact material is mainly applied to the field of miniature circuit breakers adopting automatic welding. Compared with a traditional silver graphite strip-shaped contact material, the strip-shaped contact material prepared by the method meets the automatic welding requirement, the risks of welding blistering and poor bonding strength in the prior art are avoided, and the prepared silver graphite strip-shaped contact material is excellent in processability, high in material utilization rate and suitable for batch production.

Description

technical field [0001] The invention belongs to the technical field of electrical contacts, and specifically refers to a preparation method of a silver-graphite contact material, in particular to a parallel fiber-reinforced silver-graphite ribbon contact material and a preparation method thereof. Background technique [0002] Silver graphite contact material is widely used in the fields of molded case circuit breakers, frame circuit breakers and miniature circuit breakers because of its good anti-welding performance and low and stable contact resistance. In recent years, electrical manufacturers have higher and higher requirements for the reliability and consistency of electrical components. Contact materials are supplied with strips or profiles to meet the requirements of high-end automatic welding, which has become a development trend in the electrical contact industry. In the field of miniature circuit breakers, commonly used silver-based electrical contact material strip...

AI Technical Summary

Problems solved by technology

In this processing method, the silver graphite and the solder layer are compounded by sintering, which is the same as the principle of silver graphite / silver strip composite solder in the scheme disclosed in patent ZL200910153565.2, and the solder layer is melted and bonded by heating. On the surface of silver graphite strip, but due to the poor wettability between solder and graphite, the strip prepared by ZL 201711177988.9, the bonding strength of the solder layer cannot be compared with the silver graphite / silver / solder strip with pure silver layer, The effect is not obvious in the material processing stage. When the silver graphite contact material is welded on the contact bridge, the bonding strength between the solder layer and the silver graphite layer is low, and there is a risk of contact falling off during use.

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