Copper alloy material and manufacturing method thereof

Abstract

Provided is a copper alloy material having excellent bendability, proof strength, conductivity, and stress relaxation resistance, and that is suitable for automotive components and the surrounding infrastructure, particularly in electric vehicles and hybrid electric vehicles, as well as for the lead frames, connectors, terminals, etc. of solar power generation systems and the like. The copper alloy material contains 0.1-0.8 mass% of Cr and 0.01-0.5 mass% in total of at least one type selected from the group consisting of additive element group 1 and additive element group 2, and the remainder comprises copper and inevitable impurities. In the crystal orientation analysis of a rolled surface carried out using electron backscatter diffraction measurement, the area proportion of crystal grains having an orientation that is offset at 15 DEG or less from the cube orientation {001}<100>; is 3% or above, and the proportion of S3 coincidence grain boundaries in the crystal grain boundaries is 20% or above.The additive element group 1 is 0.01-0.5 mass% in total of at least one type selected from the group consisting of Mg, Ti, and Zr; and additive element group 2 is 0.005-0.5 mass% in total of at least one type selected from the group consisting of Zn, Fe, Sn, Ag, Si, and P.

Description

technical field [0001] The present invention relates to a copper alloy material and a manufacturing method thereof. More specifically, the present invention relates to a vehicle-mounted component and its surrounding infrastructure or sunlight applied to EV (Electric Vehicle) and HEV (Hybrid Electic Vehicle) as the center. Copper alloy materials for lead frames, connectors, terminal materials, relays, switches, sockets, etc. of power generation systems, and methods for manufacturing the same. Background technique [0002] The characteristic items required for copper alloy materials used in automotive parts and peripheral infrastructures centered on EVs and HEVs, as well as lead frames, connectors, terminal materials, relays, switches, sockets, etc. used in photovoltaic power generation systems, such as There are electrical conductivity, tensile strength, bending processability, stress relaxation resistance, etc. In recent years, the higher the voltage of the system and the h...

AI Technical Summary

Problems solved by technology

Especially when contact pressure is applied to the terminal spring part at high temperature, its stress deteriorates over time, making the spring reliability a problem

In addition, in the applications listed above, the ambient temperature is rising year by year

Furthermore, not only the surrounding environment becomes a problem, but self-heating also becomes a problem due to high temperature and current loss

[0005] Second, strong spring properties and fixing strength are required for the terminal. On the other hand, if the workability (bending workability) of the bending applied to the contact part or the spring part is poor, there is no freedom in design and the necessary connector design

In addition, in general, it is well known that the bending workability is deteriorated due to the increase in wall thickness, but the increase in plate thickness is unavoidable in high-current applications, and even if it is the same as the conventional connector product, there will be problems. There is also a problem of cracking when bending

[0006] If copper (Cu) is kept in a pure metal state, the spring strength cannot reach a level that satisfies the necessary characteristics

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