Environment-friendly conductive elastic copper alloy and preparation method thereof and application in connectors

Abstract

The invention belongs to the technical field of non-ferrous metal processing, and provides an environment-friendly conductive elastic copper alloy and a preparation method and application thereof. Thecopper alloy comprises, by weight, 2.0-4.3% of Ni, 0.5-0.85% of Si, 0.05-0.4% of Mn, 0.01-0.2% of Mg, 0.01-1.0% of rare earth element and the balance of Cu. The copper alloy can keep high conductivity while having ultrahigh strength, has the characteristics of being high-temperature-resistant, stress-relaxation- resistant, complex-environment-corrosion-resistant and high in elasticity, is excellent in forming performance and high in reliability, can meet the use requirements of connectors in different application scenes, and is a new generation of alloy material for the connectors. Accordingto the preparation method, the copper alloy is prepared through smelting, casting, hot rolling, primary rolling, intermediate annealing, intermediate rolling, rapid solution treatment, finish rollingand aging treatment, so that the microstructure of the copper alloy can be effectively controlled, and various properties of the copper alloy are guaranteed.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal processing, in particular to an environment-friendly conductive elastic copper alloy, a preparation method thereof and an application in a connector. Background technique [0002] As a key component of current or signal connection, the connector is an important part of the industrial system. It is widely used in military, communication, automobile, electronics and other fields. Among them, high-performance copper alloy material is the key raw material for the connector to realize its function. With the rapid development of 5G communications, mobile terminals, artificial intelligence, aerospace and other important fields, connector technology is mainly developing in the direction of miniaturization, integration, intelligence, high performance and user-friendly use, which requires connectors Not only is the size smaller, but the performance is required to develop in the direction of high fr...

AI Technical Summary

Problems solved by technology

Among them, beryllium bronze is the main copper alloy elastic material used in high-reliability connectors at home and abroad. However, because the beryllium bronze alloy contains the highly toxic substance beryllium and the stress relaxation rate increases sharply in an environment higher than 150 ° C, it is easy to cause elastic elements The contact pressure of the device in the working state changes, causing the connector to fail

In addition, since the tin phosphor bronze alloy is a work-hardening alloy, the alloy is poor in bending forming, high temperature stress relaxation resistance and electrical conductivity, which cannot meet the needs of high-end connectors

[0004] Copper-titanium and copper-nickel-tin alloys have high strength, elasticity and other properties comparable to beryllium bronze, as well as superior processing and forming properties, corrosion resistance and high temperature stress relaxation resistance. The above two alloys have been successively studied by the United States, Japan and other countries Developed and industrialized, the typical grades are C19900, NKT322 and C72700, C72900, etc. The former has more excellent bending forming performance and meets the needs of more miniaturized structural connectors, while the latter has more excellent corrosion resistance and meets corrosion resistance The use requirements of environmental connectors are used in important fields such as aerospace, communication, and mobile terminals. However, due to insufficient conductivity, they cannot meet the use requirements of functional terminal connector materials. The new generation of high-strength conductive materials is Cu-Ni- The yield strength of Co-Si alloys in industrial production is 800~850MPa, and the strength needs to be improved. At the same time, the bending performance of Cu-Ni-Co-Si alloys is also poor.

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