Copper-alloy wire rod and manufacturing method therefor

Abstract

This copper-alloy wire rod and a manufacturing method therefor make it possible to inexpensively provide a copper-alloy wire rod that exhibits excellent elongation and flex-fatigue-resistance properties and can be used, for example, as a magnet wire. Said copper-alloy wire rod contains, by mass, 0.5% to 4% silver and 0.05% to 0.3% of each of at least one element selected from the group consisting of tin, manganese, zinc, indium, nickel, cobalt, zirconium, and chromium, with the remainder comprising copper and unavoidable impurities. This copper-alloy wire rod has a diameter or thickness of at most 0.1 mm and exhibits a nano-indentation hardness of at least 1.45 GPa in a region extending from the outer surface of the wire rod to a depth of at least 5% of the diameter or thickness of the wire rod, a nano-indentation hardness of less than 1.45 GPa in a central section, a tensile strength of at least 350 MPa, and an elongation of at least 7%.

Description

technical field [0001] The invention relates to a copper alloy wire and a manufacturing method thereof, in particular to an ultra-fine copper alloy wire for a magnetic wire and a manufacturing method thereof. Background technique [0002] With the development of electronic equipment, the miniaturization of electronic components is being promoted, and the demand for ultra-fine copper alloy wire (round wire) with a wire diameter of 0.1mm or less is increasing. For example, microspeaker coils used in mobile phones, smartphones, etc. are manufactured by winding extremely thin wires (magnet wires) with a wire diameter of 0.1 mm or less into a coil shape. [0003] In this wire winding process, toughness (elongation) is required as workability capable of forming a turn, and pure copper excellent in toughness has conventionally been used. However, pure copper has a problem of low fatigue resistance due to coil vibration because of its excellent electrical conductivity but low stren...

AI Technical Summary

Problems solved by technology

In addition, in general, the tensile strength of processed metals or alloys increases and the elongation decreases, but by applying heat treatment above a certain temperature, the elongation recovers again and the strength decreases.

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