Method for preparing Cu-Fe alloy from Cu cuttings and Fe cuttings

Abstract

The invention provides a method for preparing a Cu-Fe alloy from Cu cuttings and Fe cuttings. The mass ratio of the pure Cu cuttings to the pure Fe cuttings is 4-99:1. The method comprises the steps of uniformly mixing the pure Cu cuttings with the size of (0.1-11) mm*(0.1-4.9) mm*(0.01-1.57) mm and the pure Fe cuttings with the size of (0.1-6.5) mm*(0.1-2.7) mm*(0.01-1.46) mm; pressing the mixedcuttings at 600-890 MPa and indoor temperature for 25-65 s to obtain a cold pressed billet; pressing the cold pressed billet at 650-750 MPa and 900-1000 DEG C for 35-70 s to obtain a hot pressed billet; extruding the hot pressed billet into a bar at the extrusion ratio of 25-36:1 at 800-900 DEG C and extrusion speed of 0.1-0.5 mm / s; conducting multi-pass cold drawing on the bar at indoor temperature to obtain a wire with the percentage of cross-section contraction being 99.75%-99.99%; and finally conducting annealing treatment on the wire at 200-500 DEG C to obtain the high-strength high-conductivity Cu-Fe alloy. According to the Cu-Fe alloy prepared through the method, the melting process is not needed, oxidization and burning loss of a raw material can be effectively avoided, the solid solution rate of Fe in Cu can be greatly reduced, and accordingly, the conductivity of the Cu-Fe alloy is remarkably improved.

Description

technical field [0001] The invention belongs to the field of copper alloys, and relates to a method for preparing Cu-Fe alloys by using chips. Background technique [0002] Copper alloy has good electrical conductivity and mechanical properties, and strong plastic deformation ability. It is a key material in electronics, energy, machinery, ships and other industries. Among them, Cu-Fe alloy is low in cost, easy to smelt and plastically processed, and is used as a high-strength and high-conductivity alloy. It has broad application prospects and has attracted extensive attention from researchers. [0003] At present, Cu-Fe alloys are mainly prepared by conventional melting and casting methods, followed by subsequent deformation processing and heat treatment; during melting and casting, a large amount of Fe elements are usually solid-dissolved in the Cu matrix, which seriously reduces the conductivity of the alloy, and subsequent processing can only cause part of Fe to precipit...

AI Technical Summary

Problems solved by technology

[0003] At present, Cu-Fe alloys are mainly prepared by conventional melting and casting methods, followed by subsequent deformation processing and heat treatment; during melting and casting, a large amount of Fe elements are usually solid-dissolved in the Cu matrix, which seriously reduces the conductivity of the alloy, and subsequent processing can only cause part of Fe to precipitate. , the remaining solid solution Fe still significantly affects the conductivity

Although Cu-Fe alloy is prepared by hot pressing and sintering of Cu powder and Fe powder, it avoids melting and casting, but the powder has a large surface area and strong activity. During the preparation process, it is inevitable that the electrical conductivity will be affected due to easy oxidation and too many interfaces.